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UG:013 Page 1
VI Chip® PRM™ Evaluation Board
USER GUIDE | UG:013
Introduction 1
Features 3
Board Description 4
General Components 5
Test Points Description 7
Sockets Description 8
Schematic 9
Assembly Drawings 11
Bill of Materials 13
VTM™ Evaluation Boards 16
Recommended Test Equipment 17
Push-Pin Heat Sink Installation 17
Line and Load Connections 18
Board Operating Modes 18
Default / Adaptive-Loop Operating Mode Using PRM™ 20
Adaptive-Loop Operating Mode Using PRM™ and VTM™ 21
Remote-Sense Operating Mode Using PRM: Local Sensing (Single Ended) 21
Remote-Sense Operating Mode Using PRM™ and VTM™: Non-Isolated Remote Sensing (Differential Sensing) 23
Child Operating Mode (Arrays) 26
Paralleling 26
Conclusion 27
Contents Page
IMPORTANT NOTICE:
Be sure to read this design guide manual thoroughly before using this product. Pay attention to all cautions and warnings.
This user guide is not comprehensive and is not substitute for common sense and good practice. For example:
n When testing electronic product always use approved safety glasses.
n Provide a strain relief for wires and place the system on the bench in such a way as to prevent accidental displacement from bench top.
n Remove the power and use caution when connecting and disconnecting test probes and interface lines to avoid unintentional short circuits and contact with hot surfaces.
n Never use a jumper in place of the fuse. Replace the fuse only with its equivalent type and rating.
n Never attempt to disconnect the evaluation board from a VTM™ evaluation board while power is applied. This system is not designed to demonstrate the hot-plug capability.
Introduction
The PRM™ evaluation boards described in this document are designed to use with the PRM family of PRM regulators and demonstrate the benefits of the Factorized Power Architecture™. These evaluation boards are not designed for installation in end-user equipment. The system demonstrates the use of a PRM (the pre-regulator module) and a VTM (the current multiplier or the voltage transformation module) for general laboratory evaluation only.
UG:013 Page 2
The PRM™ evaluation board can be used to demonstrate a stand-alone buck-boost regulator or in conjunction with a VTM™ evaluation board to enable evaluation of a Factorized Power Architecture™ (FPA™) system. There are many combinations possible using PRM and VTM evaluation boards, but the focus in this user guide is using one PRM evaluation board and one VTM evaluation board, with a brief overview of how to parallel boards.
The PRM module evaluation board can be used to configure various modes of regulation depending upon the application requirements. (1) AL Operation: the PRM uses a unique feed-forward scheme that enables precise regulation of an isolated PoL voltage without the need for remote sensing and voltage feedback. (2) Remote-sense operation: the internal regulation circuitry is disabled and an external control loop and current sensor maintain regulation. This affords flexibility in the design of both voltage and current compensation loops to optimize performance in the end application. In remote-sense operation, PRM can be set in local-sense mode or in non-isolated remote-sense mode depending on the application.
Refer to the specific PRM data sheet for detail ratings of the device. It is important to remain within the device limits when testing.
These boards make it convenient to evaluate the performance of Vicor PRM products. All evaluation boards include sockets to allow easy "plug and play" insertion and removal of through-hole components and wires while providing kelvin voltage measurements test points of all pins of the PRM. Evaluation boards are designed to simplify testing of the product by providing test points and sockets for easy connection to standard test equipment, lugs for input/output connections, connectors to allow easy insertion and removal of the PRM evaluation board and VTM evaluation board.
Please note that not all evaluation board part numbers have been listed here. Full-chip and half-chip PRMs of different output power level may be using common full-chip and half-chip evaluation boards. Design-specific components have been arranged in Table 5 based on PRM output power level. It is recommended that the user should, first, find out which PRM part number is mounted on evaluation board. Second, please refer to appropriate data sheet for pin functions of PRM and modes of operation. Third, follow the appropriate section of the user guide to use the PRM evaluation board in specific modes of operation.
PRM Part Number (PS10)
Evaluation Board Number Description
Input Voltage
(V)
Output Voltage
(V)
Output Power
(W)
PRM48AF480T400A00 PRD48AF480T400A00
Full-chipPRM
evaluationboard
48 (36 – 75)
48 (20 – 55)
400
PRM48BF480T500A00 PRD48BF480T500A00 48 (38 – 55)
48 (20 – 55)
500MPRM48NF480M500A00 MPRD48NF480M500A00
PRM48JF480T500A00 PRD48JF480T500A0048
(45 – 55)48
(20 – 55)500
PRM2A01-xxxxxx PRD2A01-xxxxxx User configured
PRM2A02-xxxxxx PRD2A02-xxxxxx User configured
PRM48BH480T250A00 PRD48BH480T250A00
Half-chipPRM
evaluationboard
48 (38 – 55)
48 (20 – 55)
250MPRM48NH480M250A00 MPRD48NH480M250A00
PRM48AH480T200A00 PRD48AH480T200A0048
(36 – 75)48
(20 – 55)200
PRM48JH480T250A00 PRD48JH480T250A0048
(45 – 55)48
(20 – 55)250
PRM2A03-xxxxxx PRD2A03-xxxxxx User configured
PRM2A04-xxxxxx PRD2A04-xxxxxx User configured
Table 1 Evaluation board numbers
and their ratings
UG:013 Page 3
Contents
All PRM™ evaluation boards arrive with the following contents. (The user guide can be downloaded from www.vicorpower.com)
n 1 x PRM evaluation board
n 1 x VI Chip® push pin heat sink
n 2 x VI Chip push pins for heat sink installation
n 2 x VI Chip push pin heat sink grounding clips
n 1 x hardware kit
n 1 x through-hole aluminum-electrolytic input capacitor (CIN)
n 1 x through hole resistor for default compensation (R28)
n 1 x through hole capacitor for default compensation (C20)
n 2 x jumpers
Features
1. Input and output lugs for source and load connections
2. Input fuse (appropriately rated)
3. Input filtering and sockets to place through-hole input aluminum-electrolytic capacitor for source decoupling
4. Output filtering and sockets to place through-hole output aluminum-electrolytic capacitor
5. Switch for enabling and disabling the PRM through the ENABLE pin
6. Open drain MOSFET for enabling and disabling the PRM using external source
7. Mode selection switch for various PRM configurations
8. Trim control selection:
a. Using potentiometer
b. Using fixed resistor
c. Using external voltage source
9. Adaptive-loop control selection:
a. Using potentiometer
b. Using fixed resistor
c. Using external voltage source
10. Output current sensing for output current measurement and current feedback in remote-sense operation
11. Sockets and circuits to optimize the external control circuits in remote-sense operation
12. Voltage reference to trim pot for adjusting output voltage set point in remote-sense operation
13. Dual output connectors for transferring the power and signal connections to downstream VTM™ evaluation board
14. Oscilloscope probe jack for making accurate output voltage measurements
15. Dual paralleling connectors for ENABLE, SHARE and SGND signal connections to other PRM evaluation board
16. Kelvin voltage test points and sockets for all pins of PRM
17. Test points for current sensing and AC signal injection (RS mode)
18. Provision for installing the heat sink
UG:013 Page 4
Figure 1 Board description
9
10
7
8
5
6
3
4
1
2–OUT
–OUT
V C
V C
–OUT
–OUT
+OUT
+OUT
+OUT
+OUT9
10
7
8
5
6
3
4
1
2–S
+S V _T M V _PC
V T M_–IN
V _IM
Figure 2 Power/signal connectors pinout
(front view)
Board Description
The following section provides a detailed description of the evaluation board components, test points and sockets.
J13 Power/Signal Connector
J10 Signal Connector
UG:013 Page 5
General Components
1. PRM™ (PS10)
2. Input lugs: Sized for #10 hardware. Use these for making connection to the input source. This board does not contain reverse polarity protection. Check for proper polarity before applying the power.
3. Input fuse (F10): Appropriately rated.
4. Input filtering: Input capacitor (CIN) and filtering (inductor and ceramic capacitors) allows for stable operation with most input sources. Sockets can be used for easy installation of aluminum-electrolytic input capacitor. It is recommended to place the 22µF, 100V input electrolytic capacitor in the sockets at the input of the PRM.
5. Enable/Disable switch (S11) and FET switch: When actuator is in top position towards “ON” text on the board, the ENABLE pin will be open and PRM device will be enabled. When actuator is in bottom position towards “OFF” text on the board, the ENABLE pin will be connected to SGND and PRM device will be disabled. When switch S11 is ON, open drain FET can be selected to control the ENABLE pin using external source.
6. Header-jumper for adaptive-loop control (P10): Provides the option to select and enable adaptive-loop control:
a. Using potentiometer (R39)
b. Using fixed resistor
c. Using external voltage source
7. Header-jumper for trim control (P11): Provides the option to select and enable the trim control:
a. Using potentiometer (R40)
b. Using fixed resistor
c. Using external voltage source
8. Operating Mode selection switch (S10): For selecting one of the following operating modes:
a. Default/adaptive loop
b. Child operation (used in PRM paralleling)
c. Remote sense: local sensing (single ended)
d. Remote sense: non-isolated remote sensing (differential)
9. Output lugs: sized for #10 hardware. Use these lugs to connect the output directly to the load.
UG:013 Page 6
General Components (Cont.)
10. Signal connector (J10): Used to transfer VTM PC, IM, TM, –IN and output sense signals between the PRM™ and VTM™ boards. TM pin of VTM provides feedback to VT pin of PRM to enable temperature compensation in adaptive-loop operation of PRM and VTM.
11. Power/Signal connector (J13): Used to transfer power (+OUT/–OUT) and VC to downstream VTM board when used.
12. Output oscilloscope probe Jack (J14): Used for making the accurate scope measurements of the output voltage (i.e., ripple). Remove scope grounding lead and insert probe directly into jack ensuring a good connection between the jack and the probe ground barrel. Do not attempt to install while power is applied. May not be compatible with all scope probes.
13. Output capacitor (COUT) and output filtering (inductor and ceramic capacitors): Helps to minimize the switching ripple of the output voltage. Sockets can be used for easy installation of aluminum-electrolytic output capacitor.
14. High-side current-sense resistor and current-sense IC (R25 and U10): Current-sense shunt monitors the output current and IC provides the feedback to the IFB pin for constant current limit protection in remote-sense operation. Gain is programed using resistor R26. Constant current limit is set at ~10% above the rated output current of the PRM on all boards.
15. Voltage sense and error amplifier: Dual op-amp provides the voltage sensing and error amplifier function. It can be configured for local voltage sensing at the PRM output or a differential amplifier to allow for non-isolated remote sensing at the VTM output or load in remote-sense operation. Sockets are provided for compensation components.
16. Voltage reference and output voltage trim pot (R44) for external voltage control loop: remote-sense operation trim pot adjusts the output voltage by increasing and decreasing the error amplifier reference voltage (VREF). Turn clockwise to increase the output voltage and counterclockwise to decrease the output voltage. Sockets can be used for easy installation of soft start ceramic capacitor.
17. Dual paralleling wire to board connectors (J17 and J18): Used for transferring signal pins (ENABLE, SHARE and SGND) in parallel operation from one board to other board. Provides simple strip and insert option. Accepts 18-24AWG solid wires. Spring loaded contact will grab solid wire with no need for soldering. Connection requires for parallel regulator operation are grouped together.
18. Push-pin heat sink and grounding clip mounting holes: Use these holes for installing the optional push pin heat sink and grounding clips included with the board. Use of the heat sink with fan is highly recommended for appropriate cooling of the PRM module.
UG:013 Page 7
Test Points Description
Each test point has a socket which accepts 0.015 – 0.025 inch diameter leads for easy installation of solid wires and through-hole components. All the test points are brought out to the edge of the board to allow for easy measurement and/or connection to the user’s external circuitry. All test points are labeled and routed to the edge of the board. Each test point is accompanied with an adjacent socket for adding a test lead or to facilitate wiring to external circuitry.
ReferenceDesignator
FunctionalName Functional Description
TP30 TP33
+IN –IN
Input voltage test points provide Kelvin connection to input pins of the PRM™. Use these test points for measuring the input voltage of the PRM to avoid error due to interconnect losses.
TP31 TP32
+OUT –OUT
Output voltage test points provide Kelvin connection to output pins of the PRM. Use these test points for measuring the output voltage of the PRM to avoid error due to interconnect losses.
TP34 TP21 TP22
SGNDSignal Ground (SGND) test points are the ground reference for all control circuitry and signal pins of the PRM.
TP28 TP29
CS+ CS–
Used to measure the output current of the PRM across shunt resistor R25.
TP35 TP36
IM SG
Used to measure the output of current sense IC with reference to SGND.
TP10SHARE /
CONTROL NODE
Used to measure the SHARE/CONTROL NODE signal of the PRM with reference to SGND test point.
TP11 ALUsed to measure the AL signal of the PRM with reference to SGND test point in adaptive-loop operation.
TP12 TRIMUsed to measure the TRIM signal of the PRM with reference to SGND test point in adaptive-loop operation.
TP13 VAUXUsed to measure the VAUX signal of the PRM with reference to SGND test point.
TP14REF /
REF_ENUsed to measure the REF/REF_EN signal of the PRM with reference to SGND.
TP15 VTUsed to measure the VT signal when connected to VTM™ TM pin with reference to SGND in adaptive-loop operation.
TP16 ENABLE Used to measure the ENABLE signal with reference to SGND.
TP17 VC Used to measure the VC signal with reference to SGND.
TP18 IFBUsed to measure the IFB signal of the PRM with external constant-current circuit with reference to SGND in remote-sense operation.
TP43 TP44
VREFUsed to measure the voltage reference signal of the error amplifier with refer-ence to SGND in remote-sense operation.
TP19 TP20
NC No connect. For internal use only.
TP37 TP38
Can be used to inject the isolated signal of network analyzer for bode plot measurement to measure the stability in remote-sense operation.
TP23 TP24
VG SG
Can be used to connect function generator to control the open drain MOSFET in ENABLE control.
TP39 TP41
EXT AL SG
Can be used to enable adaptive-loop control using external source when AL control is selected using header P10 and jumper.
TP40 TP42
EXT TRIM SG
Can be used to enable TRIM control using external source when TRIM control is selected using header P11 and jumper.
Table 2 Test points description
UG:013 Page 8
ReferenceDesignator
FunctionalName Functional Description
H57 H58
Input Capacitor (CIN)
Sockets are used for easy installation of through-hole 100V-rated aluminum-electrolytic capacitor.
H32 H33
Output Capacitor (COUT)
Sockets are used for easy installation of through-hole 100V-rated aluminum-electrolytic capacitor. Ensure proper polarity with short leads while installing.
H49 H53
AL Resistor (R37)
Used for easy installation of fixed through-hole resistor between AL and SGND pins of the PRM when jumper is placed on Pin1 and Pin2 of the P10 header. Used only with adaptive loop and default switch S10 configuration.
H50 H54
Trim Resistor (R38)
Used for easy installation of fixed through-hole resistor between TRIM and SGND of the PRM™ when jumper is placed on the Pin1 and Pin2 of the P11 header. Used only with adaptive loop and default switch S10 configuration.
H41 H43
Compensation Capacitor
(C20)
Used for easy installation of through-hole compensation capacitor C20 in feedback path of error amplifier. Default through-hole 4700pF capacitor is added in the box. Used only with remote-sense operation.
H42 H44
Compensation Resistor (R28)
Used for easy installation of the through-hole compensation resistor R28 in feedback path of the error amplifier. Default through-hole 20kΩ resistor is added in the box. Used only with remote-sense operation.
H39 H40
Integrator Capacitor
(C19)Used for easy installation of through-hole compensation capacitor C19.
H47 H48
Differential Input Resistor
(R33)
Used for easy installation of through-hole resistor R33 for non-isolated differential sensing in remote-sense operation.
H51 H52
Differential Input Resistor
(R41)
Used for easy installation of through-hole resistor R41 for non-isolated differential sensing in remote-sense operation.
H55 H56
Soft-Start Capacitor
(C24)
Used for easy installation of the through-hole capacitor on top of default 0.1µF to soft-start the PRM output voltage in remote-sense operation.
H46 H45
Used to insert wires to hook up the network analyzer measuring probes to measure stability in remote-sense operation.
H30 H31
CS+ CS–
Used to insert test leads to measure the voltage across R25.
Sockets Description
Each socket accepts 0.015 – 0.025 inch diameter leads for easy installation of solid wires and through-hole components for use with external circuit and test equipment.
Table 3 Sockets description
UG:013 Page 9
Schematic
Schematic for half-chip and full-chip PRM™ evaluation board is same.
J11
J15
2220
C15
2220
C16
2220
C17
1210
C11
1210
C12
1210
C13
J16
J12
12
34
56
78
910
J13
12
34
56
78
910
J13 VC_
OU
T
1210
C14
12
34
56
78
910
12
34
56
78
910
J10
CO
NN
EC
TOR
FR
ON
T V
IEW
910
78
56
34
12
VTM
_-IN
TP3
2
TP3
1
TP3
0
TP3
3
+SEN
SE-S
ENSE
VTM
_TM
VTM
_PC
VTM
_IM
TP2
6
TP2
5
-OU
T
-OU
T
VC
VC
-OU
T
-OU
T
+OU
T
+OU
T
+OU
T
+OU
T910
78
56
34
12-S +S
V_T
MV
_PC
VT
M_-
IN
V_I
M
VT
TSO
T23
_6
3 12
654
V O
UT
V-
+IN
V+
RG-IN
U10
0603
C18
TP2
8T
P29
R26
1206
TP2
7
ENA
BLE
SHA
RE/
CON
TR
OL
NO
DE
SGN
D
ENA
BLE
TRIM
AL
SHAR
E/CO
NT
RO
L N
OD
ERE
F/RE
F_EN
VCV
TVA
UX
0603
R10
0603
R11
0603
R12
0603
R13
0603
R14
0603
R15
0603
R16
R17
0603
SGN
D
TP1
0T
P11
TP1
2T
P13
TP1
4T
P15
TP1
6T
P17
SIG
NA
L PI
N T
EST
PO
INTS
AN
D
FIXE
D R
ESIS
TO
RS
231
S11
S
G
D
SOT
23_3
Q10
0603
R21
SGN
D
TP2
3
TP2
4
VCC
SGN
D
S
ON
/OFF
CO
NTR
OL
TP3
5
TP3
6
IMO
N
IFB R1
806
03
TP1
8
ON
SGN
D
SHA
RE/C
ON
TRO
L N
OD
E
TRIMEA
O
IFB
IMO
NLO
CAL
SEN
SE_
+
PRM
_+O
UT
+SEN
SE_B
-SEN
SE_B
+SEN
SE-S
ENSE
MO
DE
SELE
CT
TRIM
AL
+IN
-IN
+OU
T
-OU
T
IFB
VC
VT
REF
/R
EF_E
N
VA
UX
SHA
RE/
CO
NTR
OL
NO
DEPRM
ENA
BLE
DA
CL
SGN
D
PS10
PRM
2_H
ALF
_JL
EAD
PRM
_+O
UT
SGN
D
TRI
M AL
VAU
X
REF/
REF_
EN
IFB
VC_O
UT
VC
1206
R22
1206
R24
1206
R23
J14
-OU
T
H37
H38
REF/
REF_
ENVA
UX
VCC
REF_
EN_
B
VT
VT
M_T
M
R19
0603
R20
0603
NC1
NC2
TP1
9T
P20
NC1
NC2
CUR
REN
T SE
NSE
AM
PLIF
IER
SGN
D
1 TRIM
SHARE/CN
IFB
REF/REF_EN
VAUX
VT
PRM_+OUT
NC
+S
–S
23
45
67
89
H28 H35
H29
H36
H31
H30
H13
H14
H15
H16
H17
H18
H10
H11
H12
H19
H20
H23 H26
H24
H25
H27
TP4
5
TP4
7
TP4
9
TP5
1
TP5
3
TP5
5
TP5
6
TP5
8
TP5
7
TP5
9
TP4
6
TP4
8
TP5
0
TP5
2
TP5
4
TP6
0T
P34
L10
L11
GN
DH
S10
H32
H33
-OU
T
H34
iPI
N
iPI
Ni
PIN
iPO
UT
iPO
UT
iPO
UT
i+S
i-Si
POU
T
TP22
TP21
H22
H21
10
123456789
1817161514131211 10
1920
S10
SW_
2191
0MST
iPO
UT
H57
H58
Cin
Cout
2220
C25
2220
C26
2512
R25
F10
TP6
2
TP6
1
TP6
3
TP6
4
TP6
5
TP6
6
TP6
7T
P68
LOCA
L SE
NSE
(Sin
gle
Ende
d)
REM
OTE
SEN
SE (D
i�er
entia
l)
CHIL
D (A
dapt
ive
Loop
)
AD
APT
IVE
LOO
P
DEF
AU
LT
CHIL
D (R
emot
e Se
nse)
Figure 3a PRM evaluation
board schematic
UG:013 Page 10
Schematic (Cont.)
12
34
56
P11
CN6_
DIG
IKEY
_952
78
TRI
M
SGN
D
TRIM
C
ON
TRO
L SE
LECT
TP4
0
TP4
2
EXT
TRI
M
TRIM
PO
T
SGN
D
12
34
56
P10
CN6_
DIG
IKEY
_952
78
AL
SGN
D
AL
CON
TRO
L SE
LECT
TP3
9
TP4
1
EXT
AL
AL
POT
SGN
D
AD
APT
IVE
LOO
P CO
NTR
OL
CIRC
UIT
RY
0603
R35
0603
R34
H50 H
54
H49
H53
CON
N3P
IN
21
3
J18
CON
N3P
IN
21
3
J17
SHA
RE/C
ON
TRO
L N
OD
E
ENA
BLE
SGN
D
0603
R46
SIG
NA
LS F
OR
PAR
ALLE
LING
SGN
D
SGN
D
VCC
R32
1206
C22
1206
C19
1206
EAO
R33
1206
SGN
D
R41
1206
+SEN
SE_
B
-SEN
SE_B
LOCA
L SE
NSE
_+
REF_
EN_
B
C23
0603
VRE
F
TP4
4
TP4
3
VOLT
AG
E SE
NSE
AN
D E
RRO
R A
MPL
IFIE
R
SGN
D
REM
OTE
SEN
SE C
ON
TRO
L C
IRCU
ITRY
VOLT
AGE
REFE
REN
CE
2 31
48
SO8
U11
A
657
U11
B
1206
R45
1206
R43
1206
C24
GND 3IN1
OUT2
GNDIN
OUT
U12 SO
T23
_3
1206
R29
1206
R31 12
06R4
2
1206
R36
1206
R28
1206
C20
C21
0603
H39
H40
H43
H44
H42
H41
H55
H56
IMO
NR2
712
06
H48
H47 H51
H52
1206
R30
H46
H45
TP3
8T
P37
R40
R39
R44
1206
R37
1206
R38
TP7
0
TP6
9T
P71
TP7
2T
P73
TP7
4
TP7
5T
P76
Figure 3b PRM evaluation
board schematic
UG:013 Page 11
Assembly Drawings
TP22
TP21
H21
H22
H34
FID02
FID01
S10
J18
J17
H11
H10
R44
R37
R39
H31
H30
H29
H28
H27
H26
H25
H24
H23
H20
H19
H18
H17
H16
H15
H14
H13
H12
TP43
TP42TP41
TP38 TP37
TP36
TP35
TP34
TP33 TP32
TP31TP30
TP29
TP28
TP27
TP26
TP25
TP24
TP23
TP20
TP19
TP18
TP17
TP16
TP15
TP14
TP13
TP12
TP11
TP10
U12
U11
U10S11
R46
R45
R43
R42
R38
R36
R35R34
R33
R32
R31
R30
R29
R28
R27
R26
R25
R24R23
R22
R21
R20R19
R18
R17
R16R15
R14
R13R12
R11
R10
Q10
P11P10
L11L10
F10
C24C23
C22
C21
C20
C18
C17
C16
C15
C14
C13
C12
C11
J14
J12J11
J15 J16
H39
H40
H41
H42
H43
H44
H45 H46
H47H48
H51H52
H55
H56
H32
H33
H37
H38
TP44
H49
H50H53
H54
R40
R41TP39
TP40
C19
H35
H36
H57
H58
J10
J13PS10
HS10
PF41
PF40 PF39 PF38
PF37PF36PF35PF34
PF33
PF32
PF31
PF30
PF29
PF28
PF27PF26PF25 PF24
PF23
PF22
PF20
PF19
PF18
PF17PF16PF15PF14PF13PF12PF11PF10PF09PF08PF07PF06PF05PF04PF01 PF02 PF03
PF42
PF43 PF44 PF45 PF46
PF47
PF48
PF49
PF50
PF50
PF49
PF48
PF47
PF46PF45PF44PF43
PF42
PF03PF02PF01
TP22
TP21
H21
H22
H34
FID02
FID01
S10
J18J17
H11
H10
R44
R37
R39
H31
H30
H29
H28
H27
H26
H25
H24
H23
H20
H19
H18
H17
H16
H15
H14
H13
H12
TP43
TP42TP41
TP38 TP37
TP36
TP35
TP34
TP33 TP32
TP31TP30
TP29
TP28
TP27
TP26
TP25
TP24
TP23
TP20
TP19
TP18
TP17
TP16
TP15
TP14
TP13
TP12
TP11
TP10
U12
U11
U10
S11
R46
R45
R43
R42
R38
R36
R35R34
R33
R32
R31
R30
R29
R28
R27
R26
R25
R24R23
R22
R21
R20R19
R18
R17
R16R15
R14
R13R12
R11
R10
Q10
PS10
P11P10
L11L10
F10
C24
C23
C22
C21
C20
C18
C17
C16
C15
C14
C13
C12
C11 J14
J12J11
J15 J16
H39
H40
H41
H42
H43
H44
H45
H46
H47H48
H51H52
H55
H56
H32
H33
H37 H38
TP44
HS10
H49
H50H53
H54
R40
R41TP39
TP40
C19
H35
H36
H57
H58
J10
J13
PF04 PF05 PF06 PF07 PF08 PF09 PF10 PF11 PF12 PF13 PF14 PF15 PF16 PF17
PF18
PF19
PF20
PF22
PF23
PF24PF25 PF26 PF27
PF28
PF29
PF30
PF31
PF32
PF33
PF34 PF35 PF36 PF37
PF38PF39PF40
PF41
Figure 4a Top view: half-chip evaluation
board assembly drawing
Figure 4b Top view: full-chip evaluation
board assembly drawing
UG:013 Page 12
TP54
TP45TP46
TP47
TP48 TP49
TP50 TP51TP52 TP53
TP55
TP56TP57
TP58TP59
TP60
C25
C26
TP61
TP62
TP63
TP64
TP65
TP66TP67
TP68
TP69 TP70
TP71
TP72
TP73
TP74
TP75
TP76
Figure 4c Bottom view:
half-chip / full-chip evaluation board assembly drawing
Assembly Drawings (Cont.)
UG:013 Page 13
Bill of Materials
Following table describes the most common components of all four versions of PRM™ evaluation boards.
ReferenceDesignator Description ManuFacturer ManuFacturer
Part Number
C11, C12, C13, C14
CAP X7R 2.2µF 10% 100V 1210 .102 MAX HT
TDK Corp. of America
C3225X7R2A225KT5LOU
C15, C16, C17 CAP X7R 4.7µF 20% 100V 2220 TDK C5750X7R2A475M
C18, C21, C23 CAP X7R 0.01µF 10% 100V 0603 MURATA GRM188R72A103KA01J
C20* not applied– use sockets
CAP X7R 4700pF 10% 50V RADIAL AVX CORP SR155C472KAR
C24 CAP X7R 0.10µF 10% 100V 1206 AVX CORP 12061C104KATMA
CINCAP ALEL 22µF 20% 100V RADIAL 8 X 11.5
PANASONIC EEU-FC2A220
F10 Design specific – see Table 5
H10 to H58 PIN RECPT 0.015/0.025 DIA 0667 SER TH MILL-MAX MFG CORP 0667-0-57-15-30-27-10-0
J10, J13CONN 10 PINS 2.54MM PITCH DUAL ROW SM HO
GCT BG225-10-A-N-A
J14 JACK VERTICAL MECH THRU HOLE TEKTRONIX 131-5031-00
J17, J18 CONN 3 POS WIRE TO BOARD SMD AVX CORP 478-6170-2-ND
JUMPER_HEADER JUMPER SOCKET XJ8AOMRON
ELECTRONICSXJ8A-0211
L10, L11 IND 0.1µH 20% 32.5A 2525 VISHAY/DALE IHLP2525CZERR10M01
P10, P11 HEADER 6 PIN STRAIGHT SMT FCI 95278-101A06LF
PCB Design specific – see Table 5
PS10 Design specific – see Table 5
Q10 FET 2N7002 SOT-23ON
SEMICONDUCTOR2N7002LT1G
R21 RES 10kΩ 1/10W 1% 0603 KOA SPEER RK73H1J1002FTD
R22 RES 0Ω JUMPER 2A 1206 KOA SPEER RK73Z2BTTD
R23, R24 RES 1Ω 1/4W 5% 1206 KOA SPEER RK73B2BTTE1R0J
R25 Design specific – see Table 5
Table 4 Common components
UG:013 Page 14
ReferenceDesignator Description ManuFacturer ManuFacturer
Part Number
R26 Design specific – see Table 5
C28* not applied– use sockets
RES 20kΩ 1/4W 1% AXIAL KOA SPEER MF1/4DCT52R2002F
R29 RES 54.9kΩ 1/4W 1% SMD 1206 KOA SPEER RK73H2BTTE5492F
R30 RES 20Ω 1/4W 1% 1206 KOA SPEER RK73H2BTTD20R0F
R31, R42 RES 1.27kΩ 1/4W 1% SMD 1206 KOA SPEER RK73H2BTTE1271F
R34 RES 0Ω JUMPER 1A 0603 KOA SPEER RK73Z1JTTD
R35 RES 4.32kΩ 1/10W 1% 0603 KOA SPEER RK73H1J4321FTD
R36 RES 1kΩ 1/4W 1% 1206 KOA SPEER RK73H2BTTE1001F
R39, R40 RES TRIM POT 100kΩ 1/2W 10% TH MURATA PV36Y104C01B00
R43 RES 10kΩ 1/4W 1% 1206 KOA SPEER RK73H2BTTE1002F
R44 RES TRIM POT 10kΩ 1/2W 10% TH COPAL ELECTRONIC CT94EY103
R45 RE 5.62kΩ 1/4W 1% SMD 1206 KOA SPEER RK73H2BTTE5621F
R46 RES 1Ω 1/10W 1% 0603 PANASONIC ERJ-3RQF1R0V
S10 MECH SMD 10-POS DIP SWITCHCTS
ELECTROCOMPONENTS219-10MSTRF
S11 SW TOGGLE SPDT 1 POS SMDC & K
COMPONENTSGT11MSCBE
TP10 to TP44 TEST POINT, SURFACE MOUNT KEYSTONE 5017
U10 IC HV I SENSE LMP8645HV TSOT-6NATIONAL
SEMICONDUCTORLMP8645HVMKE/NOPB
U11 IC DUAL OPAMP LM6142AIM 8PIN SONATIONAL
SEMICONDUCTORLM6142AIMNOPB
U12 IC VREF 1.25V REF3312 SOT23 3 TI REF3312AIDBZT
Bill of Materials (Cont.)
Following table describes the most common components of all four versions of PRM™ evaluation boards.
Please note that R28 and C20 are through-hole default compensation components required for Remote-Sense operation.
Table 4 (Cont.) Common components
UG:013 Page 15
ReferenceDesignator Description ManuFacturer ManuFacturer
Part Number
Board-Specific Components
Evaluation board numbers: PRD48AF480T400A00 and PRD2A02-xxxxxx
PS10 PRM2A FULL WIDE 400W VICORPRM48AF480T400A00
or PRM2A02-xxxxxx (user configured)
R26 RES 215kΩ 1/4W 1% 1206 KOA SPEER RK73H2BTTE2153F
R25 RES I SENSE 5mΩ 1W 1% 2512 VISHAY WSL25125L000FEA
F10 FUSE 20A 125VAC FAST 10.1X3.1 SMD LITTELFUSE 0456020.ER
PCB SNGLTD PCB FULL PRM CONFIG CB VICOR 39573
Evaluation board numbers: PRD48BF480T500A00, PRD2A01-xxxxxx,
PRD48JF480T500A00 and MPRD48NF480M500A00
PS10 PRM2A FULL NARROW 500W VICOR
PRM48BF480T500A00or PRM2A01-xxxxxx
(user configured) or PRM48JF480T500A00
or MPRM48NF480M500A00
R26 RES 174kΩ 1/4W 1% 1206 KOA SPEER RK73H2BTTE1743F
R25 RES I SENSE 5mΩ 1W 1% 2512 VISHAY WSL25125L000FEA
F10 FUSE 20A 125VAC FAST 10.1X3.1 SMD LITTELFUSE 0456020.ER
PCB SNGLTD PCB FULL PRM CONFIG CB VICOR 39573
Evaluation board numbers: PRD48AH480T200A00 and PRD2A04-xxxxxx
PS10 PRM2A HALF WIDE 200W VICORPRM48AH480T200A00
or PRM2A04-xxxxxx (user configured)
R26 RES 215kΩ 1/4W 1% 1206 KOA SPEER RK73H2BTTE2153F
R25 RES I SENSE 10mΩ 3W 1% 2512 BOURNS CRA2512-FZ-R010ELF
F10 LITTLE FUSE 10A R451010.MRL LITTELFUSE 0451010.MRL
PCB SNGLTD PCB HALF PRM CONFIG CB VICOR 38693
Evaluation board numbers: PRD48BH480T250A00, PRD2A03-xxxxxx ,
PRD48JH480T250A00 and MPRD48NH480M250A00
PS10 PRM2A HALF NARROW 250W VICOR
PRM48BH480T250A00or PRM2A03-xxxxxx
(user configured) or PRM48JH480T250A00
or MPRM48NH480M250A00
R26 RES 174kΩ 1/4W 1% 1206 KOA SPEER RK73H2BTTE1743F
R25 RES I SENSE 10mΩ 3W 1% 2512 BOURNS CRA2512-FZ-R010ELF
F10 LITTLE FUSE 10AP R451010.MRL LITTELFUSE 0451010.MRL
PCB SNGLTD PCB HALF PRM CONFIG CB VICOR 38693
Bill of Materials (Cont.)
Following table describes the most common components of all four versions of PRM™ evaluation boards.
Table 5 Board-specific components
UG:013 Page 16
Figure 5 VTM evaluation board
VTM Evaluation BoardPower / Signal Connector
VTM Evaluation BoardSignal Connector
–IN
–IN
–IN
–IN
+IN
+IN +IN
+IN
VC
VC
NC
NC VS+
VS–
IM-VTM PC-VTM
TM-VTM
VTM –IN
Figure 6 VTM evaluation board
connector pinout (front view)
VTM™ Evaluation Boards
The PRM™ evaluation board is designed to work with all types of VTM evaluation boards to facilitate testing of virtually any PRM/VTM combination. The VTM evaluation board contains dual connectors designed to mate with J10 and J13 on PRM evaluation board. The additional signal connector is used to transfer VTM signal pins, as well as S+ and S– signals between boards. The S+ and S– signals are tied to the VTM output using local sense resistors and can be used for implementing non-isolated remote sense as described in a later section. Board also provides the ability to inject an AC signal for measuring the loop response and break the isolation for non-isolated remote sense using PRM and VTM. The TM feedback of the VTM is also transferred through the additional signal connector to make connection with VT pin of the PRM to enable temperature compensation in adaptive-loop configuration.
UG:013 Page 17
Figure 7 PRM evaluation board
connection to VTM evaluation board
Recommended Test Equipment
The following is a list of recommended test equipment.
1. DC power supply: 0 – 80V, 600W minimum
2. Load: Rated appropriately based on output voltage, current and power requirements.
3. Digital multi-meters (DMMs)
4. Oscilloscope + probes
5. Function generator (for external enable/disable and trim control)
6. Auxiliary bench voltage supply (for external trim and AL control)
7. Network analyzer (remote-sense operation)
8. Interconnect wires, cables and fastening hardware.
9. Calibrated input and output shunts, appropriately rated (for efficiency measurements)
10. Trim pot screwdriver
11. Fan
12. Data sheets of requisite PRM™ and VTM™ device used.
13. Safety glasses
14. Thin-bladed tool for wire extraction from paralleling connectors (AVX part number: 06-9276-7001-01-000)
Push-Pin Heat Sink Installation
Each PRM and VTM evaluation board comes with its own heat sink and push pins for installation. Before testing, it is highly recommended that heat sinks be installed in the appropriate location for each board. When installing the push-pin heat sink, use caution not to exceed the maximum compressive on the device listed in the data sheet.
UG:013 Page 18
Line and Load Connections
n Make sure that input power supply is OFF.
n Connect the input power supply positive lead to the +IN input lug of the evaluation board.
n Connect the input power supply return lead to the –IN input lug of the evaluation board.
n Connect the output lug +OUT to the positive terminal of the electronic load.
n Connect the output lug –OUT to the return terminal of the electronic load.
n Verify proper polarity of the connections.
n Place the input capacitance 22µF, 100V.
n Turn the FAN ON.
n Have the latest version of the data sheet.
Board Operating Modes
PRM™ evaluation board supports both adaptive-loop and remote-sense operation. Therefore, operating mode selection switch S10 is provided on the board for selection of the following operating modes:
n Default / adaptive loop using PRM
n Adaptive loop using PRM and VTM
n Remote sense: local sensing (single ended)
n Remote sense: non-isolated remote sense (differential)
n Child (for array operation)
ONSGND
SHARE/CONTROL NODE
TRIM
EAO
IFB
IMONLOCAL SENSE_+
PRM_+OUT
+SENSE_B–SENSE_B
+SENSE–SENSE
REF/REF_EN VAUX
VCCREF_EN_B
VT
VTM_TM
i +S
i –S
i POUT
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 1110
1920
S10SW_21910MST
i POUT
Figure 8 Mode-select switch
UG:013 Page 19
Figure 9 provides the illustration for how to configure the switch for each operating mode.
Common Features in All Modes of Operation
n On / off control to enable and disable the PRM™ in the presence of input power.
n Using switch S11 or
n Open drain MOSFET using external circuitry or function generator
n Input filtering (inductor and ceramic capacitors)
n Output filtering (inductor and ceramic capacitors)
n Sockets for easy installation of input and output electrolytic capacitor
n Test points for current sensing
n Kelvin test points for measurement of input voltage, output voltage and all signal pins of the PRM.
n Sockets for each test point for easy installation of through-hole components and solid wires to facilitate the wiring to external circuitry and test equipment.
23
1 S11
S
G
D
SOT 23_3Q10
0603R2 1
SGND
T P23
T P24
H23
H26
T P65
T P66
ENABLE
ON / OFF CONTROL
ADAPTIVE LOOP using PRM and VTM
LOCAL SENSE (Single Ended) using PRM
REMOTE SENSE (Differential) using PRM and VTM
CHILD (Adaptive-Loop Operation)
1 2 3 4 5 6 7 8 9 10
ONOFF
ONOFF
ONOFF
ONOFF
CHILD (Remote-Sense Operation)ON
OFF
Postionnumber
DEFAULT PRM Stand-Alone Operation ONOFF
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
Figure 10 ON / OFF control
Figure 9 Switch configuration
UG:013 Page 20
Default PRM™ Stand-Alone Operation
Mode select switch S10 setting: keep the switch OFF at all positions as shown in following illustration. Please note that switch S10 is a ten-position switch.
In default operation, PRM maintains its own output voltage using active internal voltage sensing. Also internal current sensing circuit is active for constant current limit. In adaptive-loop operation, AL control programs the load line to compensate resistive drops from the PRM output voltage to point of Load. Trim control sets the output voltage other than the default 48V in the range of 20 – 55V.
Default/Adaptive-Loop Controls
Trim control: Jumper and header select either external trim, trim POT, Trim to SGND option or none. Place jumper across correct position in P11 to enable trim control. Please note that R38 – 1206 resistor footprint is not populated in trim control. Instead, External trim provides option to select sockets for easy installation of fixed resistor or surface mount test points to apply external voltage source.
Trim control provides the option to select the potentiometer R40 using proper jumper setting on header P11 in default / adaptive-loop operation. Rotate POT R40 clockwise to increase the TRIM pin voltage and counterclockwise to decrease the TRIM pin voltage. Trim control allows setting the TRIM pin voltage in the range of 1 – 2.75V to set the output voltage between 20 and 55V.
Adaptive-loop control: Jumper and header select either external AL, AL POT, AL to SGND option or none. Place jumper across correct position in P13 to enable AL control. Please note that R37 – 1206 resistor footprint is not populated in AL control. Instead, External AL provides option to select sockets for easy installation of fixed resistor or surface mount test points to apply external voltage source.
AL control provides the option to select potentiometer R39 using proper jumper setting on header P10. Rotate POT R39 clockwise to increase the AL pin voltage and counterclockwise to decrease the AL pin voltage. AL control allows setting the AL pin voltage in the range of 0 – 3V to program the PRM load line for adaptive-loop operation.
DEFAULT PRM Stand-Alone Operation ONOFF
1 2 3 4 5 6 7 8 9 10Postionnumber
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
Figure 11 Ten-position switch settings for
default / adaptive-loop
1 23 45 6
P11
CN6_DIGIKEY_95278
TRIM
SGND
TP40
TP42
0603R35
H50
H54
R401206R38
TP70
TP69 TP71 TP72
TRIM CONTROL SELECT
EXT TRIM
TRIM POT
SGND
Figure 12 Trim control selection
UG:013 Page 21
1 23 45 6
P10
CN6_DIGIKEY_95278
AL
SGND
TP39
TP41
0603R34
H49
H53
R391206R37
TP74
TP73 TP75 TP76
AL CONTROL SELECT
EXT AL
AL POT
SGND
Figure 13 Adaptive-loop selection
Adaptive-Loop Operating Mode Using PRM™ and VTM™
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in following illustration.
For use when VTM evaluation board is connected to PRM evaluation board. Switch at position 6 is ON, the TM signal of the VTM is transferred through the additional signal connector to make connection with VT pin of the PRM to enable temperature compensation in adaptive-loop operation. Other features remain the same in this mode of operation as mentioned in previous mode of operation.
Remote-Sense Operating Mode Using PRM: Local Sensing (Single Ended)
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in following illustration.
PRM and VTM ADAPTIVE LOOP ONOFF
1 2 3 4 5 6 7 8 9 10Postionnumber
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
ONOFF
1 2 3 4 5 6 7 8 9 10Postionnumber
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
Figure 14 Switch settings for
PRM and VTM adaptive loop
Figure 15 Switch settings for local sense
UG:013 Page 22
The following table describes the switch configuration.
In this configuration, PRM operates in remote sense. PRM module output voltage is sensed through divider formed by R29 and R31. U11B is configured as buffer as shown in Figure 13 and provides the sense voltage to error amplifier U11A. R33, R41 and R27 are left open, reserved for differential sensing and current sensing. R29 is set to limit the upper trim range based on a maximum reference voltage of 1.25V. Note that by default compensation components are not installed and required for operation. Default compensation components are provided with the board as described in a later section.
Table 6 Switch configuration in
local sensing
SGND
SGND
VCC
R321206C22
1206
EAO
R331206
SGND
R411206
+SENSE_B
-SENSE_B
LOCAL SENSE_+
2
31
48
SO8U11A
6
57
U11B
120654.9K
R29
12061.27K
R31
12061.27K
R42
12061K
R36
C210603
IMON
R271206
H 48H 47
H 51 H 52
120620Ω
R30
H 46 H 45
TP38TP37
OPENOPEN
OPEN
OPEN
OPEN
VREF
To CONTROL NODEthrough S10
Preinstalled componentand connections
User installedcomponent
C191206
120620K
R2812064.7nF
C20
H 39 H 40
H 43 H 44H 42H 41
To PRM +OUTthrough S10
AC signalinjection
Figure 16 Remote sense: local-sensing
(single-ended) control circuitry BLUE highlight =
Pre-installed component GREEN highlight =
user-installed component
Switch Position Number
ON / OFF Connection
1 ON TRIM pin is shorted to GND and PRM is configured for remote-sense operating mode.
2 ON CONTROL NODE pin is connected to output of external error amplifier.
3 ONIFB pin is connected to output of external current-sense amplifier to set constant-current limit.
4 ONREF_EN pin is connected to input of the external voltage reference circuit to generate voltage reference for external error amplifier.
5 ON VAUX pin is connected to power VCC of the op-amp and current-sense IC.
6 OFF TM pin of the VTM is not connected to VT pin of the PRM.
7 ONPRM +OUT pin is connected to local sense (single ended) of the remote-sense control circuitry.
8 either
9 OFF See next remote-sense operation
10 OFF See next remote-sense operation
UG:013 Page 23
Table 7 Switch configuration in
differential sensing
12061K
R36
SGND
SGND
VCC
R321206C22
1206
C191206
EAO
R331206
SGND
R411206
+SENSE_B
-SENSE_B
LOCAL SENSE_+
2
31
48
SO8U11A
6
57
U11B
1206R29
120620K
R2812064.7nF
C20
C210603
H 39 H 40
H 43 H 44H 42H 41 IMON
R271206
H 48H 47
H 51 H 52
1206R30
H 46 H 45
TP38TP37
OPENOPEN
OPEN
12061.27K
R31
12061.27K
R42
VREF
To VTM ouput (+S/–S)through S10 and J10
To CONTROL NODEthrough S10
Preinstalled componentand connections
User installedcomponent
Figure 18 Remote sense: non-isolated
remote-sensing (differential) control circuitry
BLUE highlight = Pre-installed component
GREEN highlight = user-installed component
Switch Position Number
ON / OFF Connection
1 ON TRIM pin is shorted to GND and PRM is configured for remote-sense operating mode.
2 ON CONTROL NODE pin is connected to output of external error amplifier.
3 ONIFB pin is connected to output of external current-sense amplifier to set the constant current limit.
4 ONREF_EN pin is connected to input of the external voltage reference circuit to generate voltage reference for external error amplifier.
5 ON VAUX pin is connected to power VCC of the op-amp and current-sense IC.
6 OFF TM pin of the VTM is not connected to VT pin of the PRM.
7 OFFPRM +OUT pin is NOT connected to local sense (single ended) of the remote-sense control circuitry.
8 either
9 ONVTM +OUT (+SENSE) pin is connected to positive input (+SENSE_B) of the differential buffer of remote sense control circuitry.
10 ONVTM –OUT (–SENSE) pin is connected to negative input (–SENSE_B) of the differential buffer of remote sense control circuitry.
Remote-Sense Operating Mode Using PRM™ and VTM™: Non-Isolated Remote Sensing (Differential Sensing)
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in the following illustration.
Note: To use this configuration, the VTM isolation must be broken by tying VTM –IN and VTM –OUT together.
The following table describes the switch configuration.
REMOTE SENSE (Differential) ONOFF
1 2 3 4 5 6 7 8 9 10Postionnumber
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
Figure 17 Switch settings for default / adaptive-loop non-isolated
remote (differential) sensing
UG:013 Page 24
In this configuration, the PRM™ and VTM™ evaluation boards are connected together to form a PRM / VTM pair and regulation is performed at the VTM module output. The +SENSE and –SENSE connections are made at the VTM output through connector J10. This is a non-isolated configuration and therefore the VTM isolation must be broken by tying the VTM –OUT and VTM –IN pins together. The VTM evaluation board has provisions for easily breaking the isolation. U11B is configured as a differential amplifier with gain set for appropriate output voltage. R33 and R41 set the gain. POT R44 can be used to set the required voltage at the VTM output. Maximum output voltage can be set for maximum 1.25V reference voltage. R33 and R41 is calculated using following equation.
Where: VOUT_SET(MAX) is the maximum VTM output trim voltage
Please note that R33 and R41 are not populated by default. Sockets can be used to populate through-hole resistors R33 and R41.
In order to configure the evaluation boards for non-isolated remote sense the following steps must be taken:
1. Connect the PRM and VTM evaluation boards together
2. Configure the operating mode switch as described
3. Break the isolation by connecting VTM –IN and –OUT together
4. Calculate and install the appropropriate differential sense resistors (R33 and R41)
5. Install compensation components C20 and R28
Remote-Sense Compensation Components
By default, compensation components are not populated, and are required for operation. Please note that board comes with default through-hole compensation components C20 and R28 that can be used to get a baseline for remote-sense operation. Sockets can be used for easy installation of C20 and R28. These components are not optimized and will have low bandwidth response. Transient response can be improved by adjusting the compensation components as outlined in the PRM datasheet.
It is recommended to use a network analyzer to measure the closed-loop frequency response when adjusting compensation. The PRM and VTM boards provide test points which can be used to inject the network analyzer AC signal and measure the closed-loop response.
For PRM remote-sense mode (single-ended local sense), test points TP37/TP38 and H46/H45 are in series between the PRM +OUT and the voltage-sense resistors and should be used.
For PRM-VTM remote-sense mode (differential sense) test points are provided on the VTM board in series with the +S connections (Labeled “AC Sig Inj +/–“) and should be used.
(1)RR33 = RR41 = VOUT_SET(MAX) • 1.27kΩ
1.25V
UG:013 Page 25
Trim and Soft-Start Adjustment in Remote-Sense Operation
Trim and soft start adjustment in remote-sense operation is set by the reference voltage network shown below. The PRM evaluation board is normally configured for a 20 – 55V trim range. Trim POT R44 is used to trim the output voltage in remote-sense operation.
The slew rate of the output voltage during start up may be controlled by controlling the rate-of-rise of the voltage at VREF node. This can be achieved using soft-start capacitance C24. By default, C24 is populated with 0.1µF ceramic capacitance.
Sockets H55 and H56 can be used for installation of additional through-hole soft-start capacitance. It is not recommended to extend the soft start beyond 10ms.
Current Limit Adjustment in Remote-Sense Operation
In remote-sense operation, current feedback is provided externally. The current-limit set point is a function of the current sense amplifier gain, the shunt resistor and the internal current-limit threshold of PRM. Full-chip PRM evaluation board has 5mΩ current shunt whereas half-chip PRM evaluation board has 10mΩ current shunt. The IFB current-limit threshold is fixed at 2.0V. The gain of the current-sense amplifier can be changed per Equation 2 in order to adjust the current limit. Resistor R26 set the gain of the current-sense amplifier. R25 is the current shunt.
By default, R26 is installed for the current limit approximately 10% above rated output current.
The current-limit set point can be changed by adjusting the value of R26 and appropriately setting the gain of the current-sense IC.
(2)GCS = VIFB_IL
ILIMIT_SET • RR25
REF_EN_B
C23
0603
VREF
TP44
TP43
SGND
1206R45
1206R43
1206
C24
GN
D3
IN1
OU
T2
U12
SOT23_3
H 55
H 56
R44
VOLTAGE REFERENCE
Figure 19 Voltage reference circuit
UG:013 Page 26
Child Operating Mode (Arrays)
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in following illustration. Switch configuration for children is different depending on whether using Adaptive Loop or Remote Sense operating node
Child operation is required for constructing arrays of parallel devices as described in the next section. Switch at position 1 is ON and switch at rest of the positions are OFF. When switch at position 1 is ON, TRIM pin of the PRM is shorted to SGND and PRM is configured as a child. When a PRM is configured as child, the internal voltage and current sensing circuitry are disabled and child PRMs receive their control signal (SHARE) from a parent PRM or external remote sense circuit.
For remote-sense operation parallel array where all PRMs are configured as child, switch at position 3 should be ON to enable the constant output current limit and position 5 should be ON to power the current-sense IC and enable feedback to IFB for current limit.
ONOFF
1 2 3 4 5 6 7 8 9 10Postionnumber
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
ONOFF
1 2 3 4 5 6 7 8 9 10Postionnumber
TRIM
SHA
RE/C
N
IFB
REF/
REF_
EN
VAU
X VT
PRM
_+O
UT
NC +S –S
Figure 20 Child configuration for adaptive-loop parent.
Parent/child configured PRM™ parallel arrays
Figure 21 Child configuration for
remote-sense Operation. Child configured PRM
parallel arrays
UG:013 Page 27
Paralleling
The paralleling and current sharing capability of the devices can be demonstrated by stacking multiple evaluation board and interconnecting the inputs and outputs with standoffs of sufficient current rating to create a parallel array. See Figure 16 below. One board should be configured normally for adaptive-loop or remote-sense operation and placed on top for easy access to control circuitry. The remaining PRMs should be configured as Children and placed underneath.
When paralleling PRMs, the ENABLE, SHARE and SGND pins should be connected together. Dual paralleling wire to board connectors (J17 and J18) are used for transferring signal pins (ENABLE, SHARE and SGND) in parallel operation from board to board. These connectors provide simple strip and insert option and accept 18-24AWG solid wires. SHARE and SGND wires can be twisted to minimize noise pick-up. Note that when using J17 and J18, SGND pins will be connected together through an on-board 1Ω series resistor to decouple signal grounds.
VTM™ boards can also be connected in parallel to create high power PRM-VTM arrays. VTM input and outputs need to be connected in parallel using same size standoffs. Each VTM requires a VC signal from a PRM in order to start and it is recommended to connect one PRM VC to one VTM VC using the connector J13 when possible. If needed a single PRM VC can be used to drive up to two VTMs (will require additional off board connections).
Conclusion
The PRM™ evaluation board is a flexible tool which allows users to implement and perform basic testing on various configurations, including PRM-VTM™ module combinations. This user guide covers some basic topics; however, it cannot describe every scenario. If additional information required, please contact Vicor Applications Engineering.
Top - Parent
Bottom - Children
Interconnect signals
Figure 22 Paralleling of PRM
evaluation board
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