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1dc1788bfa
DEMO MANUAL DC1788B
Description
LT4275 LTPoE++, IEEE 802.3at/
IEEE 802.3af Compliant PD Controller
Demonstration circuit 1788B features the LT®4275, a fourth generation powered device (PD) controller for Power over Ethernet (PoE) applications.
The DC1788B is available in DC1788B-A, DC1788B-B, and DC1788B-C versions to meet the power level required by the PD application. The DC1788B-A features the LT4275A PD controller. This controller supports the IEEE 802.3at (Type 2, PoE+), IEEE 802.3af (Type 1, PoE) and LTPoE++™ specification. LTPoE++ adds four power levels to the ex-isting IEEE standard with 38.7W, 52.7W, 70W, and 90W of delivered PD power at the RJ45 jack. The DC1788B-B features the LT4275B PD controller and is compliant with the IEEE 802.3at and IEEE 802.3af specifications. The DC1788B-C features the LT4275C PD controller and is compliant with the IEEE 802.3af specification.
The DC1788B includes an RJ45 Ethernet port, a high power Ethernet magnetic, a discrete active bridge recti-fier, a surge protector, an external N-channel FET, and the LT4275. The discrete active bridge rectifier is used to achieve higher efficiency than a conventional diode bridge rectifier. Many of the main features from the previous gen-eration PD controller are included in this generation PD
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
controller. These include a power good indicator, a power sourcing equipment (PSE) type indicator, and support for an auxiliary power input. The major difference from the previous generation PD controller is that the LT4275 drives an external N-channel Hot Swap™ FET at the PoE high side voltage rail. This allows the user to choose a low RDS(ON) N-channel MOSFET to maximize power efficiency, reduce heat dissipation, and ease thermal design. An LED status indicator is included to indicate the Hot Swap FET is fully turned on and the PSE is powering the PD. A suf-ficient load to sink more than 10mA is also included to assure the PSE maintains power to the PD and to meet the DC maintain power signature current required by the IEEE 802.3at/IEEE 802.3af specification.
Simply connect the output of the DC1788B to the DC/DC converter that is right for the application. Linear Technology offers a variety of DC/DC converter solutions that can be used with the DC1788B (eg DC894, DC1317, etc).
Design files for this circuit board are available at http://www.linear.com/demo
Table 1. Summary of Features Supported by the DC1788B Assemblies
ASSEMBLY PoE STANDARDMAXIMUM POWER
LEVELPOWER GOOD
INDICATOR (PWRGD)PSE TYPE INDICATOR
(T2P)AUXILIARY SUPPLY
SUPPORT
DC1788B-A LTPoE++ PoE+ PoE
90W Yes Yes No
DC1788B-B PoE+ PoE
25.5W Yes Yes Yes
DC1788B-C PoE 13W Yes No Yes
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DEMO MANUAL DC1788B
Table 2. DC1788B Performance SummaryPARAMETER CONDITION VALUE
PD Input Voltage After Start-Up (VPORT) At the PD Ethernet Port LTPoE++ 38.7W
49.8V to 57V
LTPoE++ 52.7W 47.8V to 57V
LTPoE++ 70W 45.1V to 57V
LTPoE++ 90W 41.0V to 57V
IEEE 802.3at (Type 2, 25.5W) 42.5V to 57V
IEEE 802.3af (Type 1, 13W) 37V to 57V
Efficiency DC1788B-A, VPORT = 48V, ILOAD = 1.1A 99.1% (Typical)
DC1788B-B, VPORT = 48V, ILOAD = 600mA 98.9% (Typical)
DC1788B-C, VPORT = 48V, ILOAD = 350mA 99.1% (Typical)
PoE Type Switching Frequency An LTPoE++ PSE is Powering a DC1788B-A 840Hz
performance summary
theory of operationWhen an LTPoE++ PSE is connected to the DC1788B demo board RJ45 connector, J1, via a CAT5e or CAT6 Ethernet cable, the PSE initiates the detection process. During this process, the discrete active bridge acts as a standard diode bridge and the PD solution presents a 25k resistive load to the PSE. After the PD has passed the detection process, the PSE uses an IEEE 802.3at/IEEE 802.3af or LTPoE++ classification method to determine the power level the PSE can deliver to the PD. The PSE turns on the port and provides power to the PD if the classification is successful. During turn on, the MOSFETs of the discrete active bridge are fully enhanced with low RDS(ON) in the high current path. This reduces the power and heat dissipa-tion compared to the conventional diode bridge. Once the LT4275 detects the PSE has turned on the port, it drives an external N-channel MOSFET to ramp up the output voltage. After a successful PD controller output turn on, the LT4275 drives a power good indicator (PWRGD) and a PSE Type indicator (T2P) (DC1788B-A and DC1788B-B only). The PWRGD indicator signals the load to start draw-ing current and the T2P indicator signals the load the type of PSE powering the PD.
Classification Signaling
The resistors at RCLS and RCLS++ determine the clas-sification signature and sequence. The DC1788B-A in-cludes user-selectable jumpers to support IEEE 802.3af,
IEEE 802.3at, and LTPoE++ power levels from 3.84W to 90W. Refer to Table 3 for the power levels. If an LTPoE++ power level is selected, an IEEE 802.3af or IEEE 802.3at compliant PSE will classify this PD as a Class 4 PD. The DC1788B-B includes a preselected RCLS resistor to support IEEE 802.3at 2-event classification and this board does not contain jumper blocks. The DC1788B-C includes multiple jumpers to support all IEEE 802.3af power levels. Table 3 shows each shunt position and its associated class number and power level for the DC1788B-A and -C boards. Use Table 3 as a selection guide to choose a suitable power level for the load.
Table 3. DC1788B-A and DC1788B-C Shunt Positions for PoE Power Levels
ASSEMBLYPoE
CLASSPOWER LEVEL AT
THE PD INPUT RCLASS JUMPERS
DC1788B-A & -C 0 13W JP1 JP2
DC1788B-A & -C 1 3.84W JP3 JP4
DC1788B-A & -C 2 6.49W JP5 JP6
DC1788B-A & -C 3 13W JP7 JP8
DC1788B-A 4 25.5W JP9 JP10
DC1788B-A 4* 38.7W JP11 JP12
DC1788B-A 4* 52.7W JP13 JP14
DC1788B-A 4* 70W JP15 JP16
DC1788B-A 4* 90W JP17 JP18
*An LTPoE++ PD will be classified as Class 4 by an IEEE 802.3at/af compliant PSE.
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DEMO MANUAL DC1788B
Power Good Indicator and Power Supply Start-Up
The LT4275 limits the inrush current to the output bulk capacitor by controlling the output voltage slew rate during turn-on. The slew rate is preprogrammed via a resistor and a capacitor at the LT4275 HSGATE pin on the DC1788B to limit the inrush current to the bulk capacitor on board. If more capacitance is desired at the output, refer to Inrush and Powered On section in the LT4275 data sheet to recalculate the inrush current and ensure it is below the IEEE requirement of approximately 100mA. The inrush current limit will cause startup problems if an attached load draws more than 100mA of current during inrush. Therefore, it is strongly recommended to use the PWRGD indicator on the DC1788B to interface to a load such as a DC/DC converter as shown in Figures 1, 2 and 4.
PSE Type Indicator
Refer to Table 4 for the summary of T2P indicator signals supported by the DC1788B assembly. The T2P signal is valid after PWRGD is active. This indicator is not connected on the DC1788B-C.
Table 4. Summary of T2P Signals Supported by the DC1788B Assemblies
ASSEMBLY PSE TYPE T2P SIGNAL
DC1788B-A LTPoE++ 840Hz, 50% Duty Cycle
IEEE 802.3at (Type 2, PoE+) Logic Low
IEEE 802.3af (Type 1, PoE) Logic High
DC1788B-B LTPoE++ Logic Low
IEEE 802.3at (Type 2, PoE+) Logic Low
IEEE 802.3af (Type 1, PoE) Logic High
DC1788B-C Any PSE Not Supported
theory of operationAuxiliary Supply Support
The DC1788B-B and DC1788B-C versions support an auxiliary supply input. The auxiliary supply input has pri-ority over the PoE input. When the PD controller detects a valid voltage from the auxiliary supply input, it turns off the N-channel MOSFET (Q2) to cut the power from the PSE and lets the auxiliary supply take over powering the load. The PSE may detect the disconnected PD and turn off the port. The PWRGD indicator outputs a logic high signal when an auxiliary supply is present. The T2P indi-cator outputs a logic low signal on the DC1788B-B board when an auxiliary supply is present. The auxiliary supply input is an assembly option on the DC1788B-A board.
DC1788B Companion PSE Demo Boards
Linear Technology offers a variety of PSE solutions to evaluate with DC1788B. Refer to Table 5 to select a PSE demo board based on the DC1788B assembly and the application power requirement.
Table 5. Selection of Companion PSE Demo Board depending on the DC1788 Assembly and the PoE Power Level
DC1788 ASSEMBLY
PoE POWER LEVEL
COMPANION PSE DEMO BOARD
DC1788B-A 90W DC1814A-D
70W DC1814A-C
52.7W DC1814A-B
38.7W DC1814A-A
DC1788B-B 25.5W DC1567A
DC1788B-C 13W DC981A/B
**Contact Linear for multi-port PSE demo board options.
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DEMO MANUAL DC1788B
Dc1788B-a quick start proceDureNOTE: Handle the DC1788B-A by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 1 to evaluate the DC1788B-A with a DC/DC converter. If a resistive load is used to evaluate the DC1788B-A, connect the load by hand between VOUT+ and VOUT– after the LED (D3) is lit. It is recommended to disconnect the resistive load before powering down the DC1788B-A, so at the next turn on the load is discon-nected. If the load is not connected and disconnected by hand properly, the PD may not power on. Contact field applications engineers for further details.
2. Default class select shunt positions are at JP1 and JP2 on the DC1788B-A board. In this configuration, any PSE will turn on this PD. Choose a power level from Table 3 and select the corresponding shunt positions.
3. Check the power delivery capability of the LTPoE++ PSE to ensure it can power the PD and the load. Do not select a jumper position corresponding to a higher power level than the LTPoE++ PSE can provide. Oth-erwise, the LTPoE++ PSE will not turn on the PD after classification.
4. Connect the output of the PSE to the RJ45 connector (J1) on the DC1788B-A board with a CAT5e or CAT6 Ethernet cable.
5. After connection has been established, verify that the LED (D3) is lit. This indicates the PSE has successfully detected and powered the PD
Figure 1. Setup Diagram for the DC1788B-A with a DC/DC Converter, a Microprocessor, and an LTPoE++ PSE
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DEMO MANUAL DC1788B
Dc1788B-B quick start proceDureNOTE: Handle the DC1788B-B by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 2 to evaluate the DC1788B-B with a DC/DC converter. If a resistive load is used to evaluate the DC1788B-B, connect the load by hand between VOUT+ and VOUT– after the LED (D3) is lit. It is recommended to disconnect the resistive load before powering down the DC1788B-B, so at the next turn on the load is discon-nected. If the load is not connected and disconnected by hand properly, the PD may not power on. Contact field applications engineers for further details.
2. Connect the output of the PSE to the RJ45 connector (J1) on the DC1788B-B board with a CAT5e or CAT6 Ethernet cable.
3. After connection has been established, verify that the LED (D3) is lit. This indicates the PSE has successfully detected and powered the PD.
Auxiliary Supply Input
1. Refer to Figure 3 to evaluate the DC1788B-B with a DC/DC converter and an auxiliary DC power supply.
2. Connect the auxiliary supply to the AUX+ to AUX– in-puts. Check to make sure the voltage polarity is correct before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the LED (D3) is lit.
Figure 2. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and a Type 2 PSE
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DEMO MANUAL DC1788B
Dc1788B-B quick start proceDure
Figure 3. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and an Auxiliary DC Power Supply
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DEMO MANUAL DC1788B
NOTE: Handle the DC1788B-C by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 4 to evaluate the DC1788B-C with a DC/DC converter. If a resistive load is used to evaluate the DC1788B-C, connect the load by hand between VOUT+ and VOUT– after the LED (D3) is lit. It is recommended to disconnect the resistive load before powering down the DC1788B-C, so at the next turn on the load is discon-nected. If the load is not connected and disconnected by hand properly, the PD may not power on. Contact field applications engineers for further details.
2. Connect the output of the PSE to the RJ45 connector (J1) on the DC1788B-C board with a CAT5e or CAT6 Ethernet cable.
3. After connection has been established, verify that the LED (D3) is lit. This indicates the PSE has successfully detected and powered the PD.
Auxiliary Supply Input
1. Refer to Figure 5 to evaluate the DC1788B-C with a DC/DC converter and an auxiliary DC power supply.
2. Connect the auxiliary supply to the AUX+ to AUX– in-puts. Check to make sure the voltage polarity is correct before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the LED (D3) is lit.
Figure 4. Setup Diagram for the DC1788B-C with a DC/DC Converter and a Type 1 PSE
Dc1788B-c quick start proceDure
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DEMO MANUAL DC1788B
Dc1788B-c quick start proceDure
Figure 5. Setup Diagram for the DC1788B-C with a DC/DC Converter and an Auxiliary DC Power Supply
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DEMO MANUAL DC1788B
quick start proceDure
Figure 6. DC1788B-A Efficiency at Various PoE Load Currents (without LED D3)
Figure 7. Thermal Image. DC1788B-A with 90W Load. Top View
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DEMO MANUAL DC1788B
quick start proceDure
Figure 8. Thermal Image. DC1788B-A with 90W Load. Bottom View
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DEMO MANUAL DC1788B
parts listITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit ComponentsDC1788B General BOM
1 1 C1 Cap., X7R, 0.1µF, 100V, 10%, 0805 TDK, C2012X7R2A104K2 1 C3 Cap., X7R, 47nF, 100V, 10%, 0805 AVX, 08051C473KAT2A3 1 CG1 Cap., X7R, 1nF, 2KV, 10%, 1808 TDK, C4520X7R3D102K4 4 CT1, CT2, CT3, CT4 Cap., X7R, 0.01µF, 10%, 200V, 0805 AVX, 08052C103KAZ2A5 1 D2 Diode, SMBJ58A, SMB-DIODE DIODES INC., SMBJ58A-13-F 6 8 D4-D7, D17-D20 Diode, MMSZ5242BS, SOD-323 DIODES INC., MMSZ5242BS7 8 D8-D11, D13-D16 Diode, MMBD4148, SOT23 FAIRCHILD, MMBD4148 8 4 Q3-Q6 Trans., MMBT3904, SOT23 FAIRCHILD, MMBT39049 4 Q9-Q12 Trans., MMBT3906, SOT23 FAIRCHILD, MMBT3906
10 1 R12 Res., Chip, 8.2Ω, 5%, 0603 VISHAY, CRCW06038R20JNEA11 1 R13 Res., Chip, 3.3k , 5%, 0603 VISHAY, CRCW06033K3JNEA12 1 R14 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA13 8 R18-R21, R43-R46 Res., Chip, 100k, 5%, 0402 VISHAY, CRCW0402100KJNEA14 8 R23, R25, R27, R29, R34, R36, R38, R40 Res., Chip, 4.3k , 5%, 0402 VISHAY, CRCW04024K30JNEA15 8 R24, R26, R28, R30, R35, R37, R39, R41 Res., Chip, 3.6k , 5%, 0402 VISHAY, CRCW04023K60JNEA16 4 RT1-RT4 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA17 2 U2, U3 Quad MOSFETs, FDMQ8203 FAIRCHILD, FDMQ8203
DC1788B-A BOM1 1 Q1 Trans., FDMC86102, POWER33 FAIRCHILD, FDMC861022 1 R10 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA3 1 R15 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA4 1 R31 Res., Chip, 10k, 1%, 0805 VISHAY, CRCW080510K0FKEA5 2 RC1, RC6 Res., Chip, 140Ω, 1%, 0805 VISHAY, CRCW0805140RFKEA6 2 RC2, RC8 Res., Chip, 76.8Ω, 1%, 0805 VISHAY, CRCW080576R8FKEA7 2 RC3, RC10 Res., Chip, 49.9Ω, 1%, 0805 VISHAY, CRCW080549R9FKEA8 2 RC4, RC5 Res., Chip, 34.8Ω, 1%, 0805 VISHAY, CRCW080534R8FKEA9 1 RC7 Res., Chip, 46.4Ω, 1%, 0805 VISHAY, CRCW080546R4FKEA
10 1 RC9 Res., Chip, 64.9Ω, 1%, 0805 VISHAY, CRCW080564R9FKEA11 1 RC11 Res., Chip, 118Ω, 1%, 0805 VISHAY, CRCW0805118RFKEA12 1 T1 XFMR, Würth 749022016 WÜRTH, 74902201613 1 U1 IC, LT4275AIDD, DFN10DD LINEAR TECHNOLOGY, LT4275AIDD
Optional Circuit Components1 0 C2 Cap., OPT, 0402 OPT3 0 C5 Cap., OPT, 0603 OPT4 0 D1 Diode, OPT, SMA OPT5 0 D12 Diode, OPT, SOD-123 OPT6 0 E5,E6 TP, OPT OPT7 0 Q2 Trans., FDN8601, SOT23 FAIRCHILD, FDN86018 0 Q7,Q8 Trans., OPT, SOT23 OPT9 0 R9, R22, R33, R42 Res., 0603, OPT OPT6 0 R16, R17, R32 Res., 0805, Opt OPT2 0 RV1-RV4 Varistor, Opt SANKOSHA, SD4-90, OPT
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DEMO MANUAL DC1788B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBERHardware for Demo Board Only
1 1 C4 Cap., 22µF, 100V, OS-CON SUN ELECT., 100CE22BS2 1 CG2 Cap., X7R, 1nF, 2kV, 10%, 1808 TDK, C4520X7R3D102K3 1 D3 LED, LN1351C-(TR), J-Type-LN1351CTR PANASONIC, LN1351C-(TR)4 3 E1, E2, E4 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 5 1 E3 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 6 2 J1, J2 Conn., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF 7 18 JP1-JP18 HDR, 1x2 2mm, HD1X2-079 SAMTEC, TMM-102-02-L-S8 1 R11 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA9 1 RMPS1 Res., Chip, 5.1k, 5%, 2512 VISHAY,CRCW25125K10JNEA
10 4 RT5-RT8 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA11 1 Fab, Printed Circuit Board DEMO CIRCUIT 1788B
DC1788B-B BOM1 1 C5 Cap., X5R, 0.1µF, 25V, 10%, 0603 TDK, C1608X5R1E105K2 1 D1 Diode, B1100A, 100V, SMA DIODES INC., B1100A3 1 D12 Diode, 30V, Zener, SOD-123 CENTRAL SEMI, CMHZ5256B4 1 E3 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 5 2 E5, E6 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 6 1 Q2 Trans, FDN8601, SOT23 FAIRCHILD, FDN86017 2 Q7, Q8 Trans, MMBTA42, 300V, SOT23 FAIRCHILD, MMBTA428 1 R9 Res., Chip, 82.5k, 1%, 0603 VISHAY, CRCW060382K5FKEA9 1 R10 Res., Chip, 20k, 1%, 0603 VISHAY, CRCW060320KFKEA
10 2 R15, R22 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA11 1 R16 Res., Chip, 34.8Ω, 1%, 0805 VISHAY, CRCW080534R8FKEA12 1 R32 Res., Chip, 10k, 5%, 0805 VISHAY, CRCW080510K0JNEA13 1 R33 Res., Chip, 56k, 5%, 0603 VISHAY, CRCW080556K0JNEA14 1 R42 Res., Chip, 62k, 5%, 0402 VISHAY, CRCW040262K0JNED15 1 RMPS1 Res., Chip, 4.7k, 5%, 2512 VISHAY, CRCW25124K70JNEG16 1 T1 XFMR, Würth 749022017 WÜRTH, 74902201717 1 U1 IC, LT4275BIDD, DFN10DD LINEAR TECHNOLOGY, LT4275BIDD
Optional Circuit Components1 0 C2 Cap., OPT, 0402 OPT2 0 JP1-JP18 HDR, 1x2 2mm, Opt OPT3 0 Q1 Trans., Opt OPT4 0 R17, R31 Res., 0805, Opt OPT5 0 RC1-RC11 Res., 0805, Opt OPT6 0 RV1-RV4 Varistor, Opt Sankosha, SD4-90, OPT
Hardware for Demo Board Only1 1 C4 Cap., 22µF, 100V, OS-CON SUN ELECT., 100CE22BS2 1 CG2 Cap., X7R, 1nF, 2KV, 10% 1808 TDK, C4520X7R3D102K3 1 D3 LED, LN1351C-(TR), J-Type-LN1351CTR PANASONIC, LN1351C-(TR)4 3 E1, E2, E4 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 5 1 E3 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 6 2 J1, J2 Conn., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF 7 18 JP1-JP18 HDR, 1x2 2mm, HD1X2-079 SAMTEC, TMM-102-02-L-S
parts list
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DEMO MANUAL DC1788B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER8 1 R11 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA9 1 RMPS1 Res., Chip, 5.1k, 5%, 2512 VISHAY, CRCW25125K10JNEA
10 4 RT5-RT8 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA11 1 Fab, Printed Circuit Board DEMO CIRCUIT 1788B
DC1788B-C BOM1 1 C5 Cap., X5R, 0.1µF, 25V, 10%, 0603 TDK, C1608X5R1E105K2 1 D1 Diode, B1100A, 100V, SMA DIODES INC., B1100A3 1 D12 Diode, 30V Zener, SOD-123 CENTRAL SEMI, CMHZ5256B4 2 E5,E6 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 5 1 Q2 Trans., FDN8601, SOT23 FAIRCHILD, FDN86016 2 Q7,Q8 Trans., MMBTA42, 300V, SOT23 FAIRCHILD, MMBTA427 1 R9 Res., Chip, 82.5k, 1%, 0603 VISHAY, CRCW060382K5FKEA8 1 R10 Res., Chip, 20k, 1%, 0603 VISHAY, CRCW060320KFKEA9 1 R22 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
10 1 R32 Res., Chip, 10k, 5%, 0805 VISHAY, CRCW080510K0JNEA11 1 R33 Res., Chip, 56k, 5%, 0603 VISHAY, CRCW060356K0JNEA12 1 R42 Res., Chip, 62k, 5%, 0402 VISHAY, CRCW040262K0JNED13 1 RC1 Res., Chip, 140Ω, 1%, 0805 VISHAY, CRCW0805140RFKEA14 1 RC2 Res., Chip, 76.8Ω, 1%, 0805 VISHAY, CRCW080576R8FKEA15 1 RC3 Res., Chip, 49.9Ω, 1%, 0805 VISHAY, CRCW080549R9FKEA16 1 RMPS1 Res., Chip, 4.3k, 5%, 2512 VISHAY, CRCW25124K30JNEA17 1 T1 XFMR, Würth 749023015 WÜRTH, 74902301518 1 U1 IC, LT4275CIDD, DFN10DD LINEAR TECHNOLOGY, LT4275CIDD
Optional Circuit Components1 0 C2 Cap., OPT, 0402 OPT2 0 E3 TP, Turret, 0.094", Opt OPT3 0 JP2, JP4, JP6, JP8, JP9-JP18 HDR, 1x2 2mm, Opt OPT4 0 Q1 Trans., Opt OPT5 0 R15 Res., 0603, Opt OPT6 0 R16, R17, R31 Res., 0805, Opt OPT7 0 RC4-RC11 Res., Opt OPT8 0 RV1-RV4 Varistor, Opt SANKOSHA, SD4-90, OPT
Hardware for Demo Board Only1 1 C4 Cap., 22µF, 100V, OS-CON SUN ELECT., 100CE22BS2 1 CG2 Cap., X7R, 1nF, 2KV, 10% 1808 TDK, C4520X7R3D102K3 1 D3 LED, LN1351C-(TR), J-Type-LN1351CTR PANASONIC, LN1351C-(TR)4 3 E1, E2, E4 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 5 2 J1, J2 Conn., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF 6 4 JP1, JP3, JP5, JP7 HDR, 1x2 2mm SAMTEC, TMM-102-02-L-S7 1 R11 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA8 1 RMPS1 Res., Chip, 5.1k, 5%, 2512 VISHAY, CRCW25125K10JNEA9 4 RT5-RT8 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
10 1 Fab, Printed Circuit Board DEMO CIRCUIT 1788B
parts list
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DEMO MANUAL DC1788B
schematic Diagram5 5
4 4
3 3
2 2
1 1
DD
CC
BB
AA
37V
- 57V
DEMO
CIR
CUIT
1788
B
1. A
LL R
ESIS
TORS
AND
CAP
ACIT
ORS
ARE
0603
2. A
LL R
ESIS
TORS
TOL
ERAN
CE R
ATIN
G AR
E 5%
NOTE
1: U
NLES
S OT
HERW
ISE
SPEC
IFIE
D
37V-
57V
IN F
ROM
LTPO
E++
PSE
OUT
TO P
HYJU
MPE
R SE
LECT
IONS
POE
CLA
SS C
LASS
++
CLA
SSPO
WER
* SEE
OPT
ION
TABL
ES O
N SH
EET
2
ASSY
A,C
A,C
A,C
A,C A A A A A
0 1 2 3 4 4 ***
4 ***
4 ***
4 ***
13W
3.84
W6.
49W
13W
25.5
W38
.7W
52.7
W70
W90
W
JP1
JP3
JP5
JP7
JP9
JP11
JP13
JP15
JP17
JP2
JP4
JP6
JP8
JP10
JP12
JP14
JP16
JP18
***AN
LTP
OE +
+ P
D W
ILL
BE C
LASS
IFIE
D AS
CLA
SS 4
BY
AN IE
EE 8
02.3
AT
COM
PLIA
NT P
SE.
*
****
RCLA
SS JU
MPER
S
** ** ** ** ** ** ** **
** ** ** ** ** ** ** **
RCLA
SS++
RCLA
SS
VPORTN
RCLASS
RCLASS++
DATA
1DA
TA2
SPAR
E1SP
ARE2 VP
ORTP
VPOR
TNAUX+
SIZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
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OMER
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OLOG
Y HA
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MAT
IC
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OGY
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S.SC
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www.
linea
r.com 1
Wedn
esda
y, Fe
brua
ry 06
, 201
31
2
LTPO
E + +
POW
ERED
DEV
ICE
KAUN
G H.
KAUN
G H.
N/A
LT42
75XI
DDSI
ZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
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S EN
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ERIN
G FO
R AS
SIST
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.
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CIR
CUIT
IS P
ROPR
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RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
www.
linea
r.com 1
Wedn
esda
y, Fe
brua
ry 06
, 201
31
2
LTPO
E + +
POW
ERED
DEV
ICE
KAUN
G H.
KAUN
G H.
N/A
LT42
75XI
DDSI
ZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
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T EF
FORT
TO
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www.
linea
r.com 1
Wedn
esda
y, Fe
brua
ry 06
, 201
31
2
LTPO
E + +
POW
ERED
DEV
ICE
KAUN
G H.
KAUN
G H.
N/A
LT42
75XI
DD
REVI
SION
HIS
TORY
DESC
RIPT
ION
DATE
APPR
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ECO
REV
KAUN
G H.
PROD
UCTI
ON1
01-0
7-13
__
REVI
SION
HIS
TORY
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RIPT
ION
DATE
APPR
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REV
KAUN
G H.
PROD
UCTI
ON1
01-0
7-13
__
REVI
SION
HIS
TORY
DESC
RIPT
ION
DATE
APPR
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ECO
REV
KAUN
G H.
PROD
UCTI
ON1
01-0
7-13
__
CT3
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*RM
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12
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JP14
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TP5
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58 7123
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75
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E6AU
X-*
E6AU
X-*
15dc1788bfa
DEMO MANUAL DC1788B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram5 5
4 4
3 3
2 2
1 1
DD
CC
BB
AA
DEMO
CIR
CUIT
1788
B
-A*
U1
-B -C
LT42
75AI
DDLT
4275
BIDD
LT42
75CI
DD
T174
9022
016
D1 OPT
B110
0AB1
100A
Q1FD
MC8
6102
OPT
OPT
R9 OPT
82.5
K82
.5K
R10 0 20
K
E5 OPT
STUF
F
E6 OPT
7490
2201
774
9023
015
ASSY
20K
R22
OPT
100K
100K
R32
OPT
10K
10K
R33
OPT
56K
56K
R31
10K
OPT
OPT
R42
OPT
62K
62K
D12
OPT
CMHZ
5256
B
CMHZ
5256
B
OPT
C5 0.1u
F0.
1uF
STUF
FST
UFF
STUF
FST
UFF
E3 OPT
STUF
FR1
510
0K
OPT
JP1,3
,5,7
JP2,
4,6,
8JP
9-JP
18
RMPS
1
STUF
F
STUF
FOP
TOP
TOP
T
OPT
OPT
5.1K
4.7K
4.3K
R16
34.8
100K
OPT
OPT
STUF
FST
UFF
OPT
140
OPT
140
76.8
76.8
34.8
RC4
OPT
49.9
49.9
OPT
RC1
RC2
RC3
OPT
34.8
RC5
OPT
OPT
140
RC6
OPT
OPT
46.4
RC7
OPT
OPT
76.8
RC8
OPT
OPT
64.9
RC9
OPT
OPT
49.9
RC10
OPT
OPT
118
RC11
OPT
OPT
-AASSY
-B -C
**
Q2 OPT
FDN8
601
FDN8
601
MM
BTA4
2
Q7, Q
8OP
TM
MBT
A42
NOTE
2: U
NLES
S OT
HERW
ISE
SPEC
IFIE
D1.
ALL
RES
ISTO
RS A
RE 04
022.
ALL
RES
ISTO
RS T
OLER
ANCE
RAT
ING
ARE
5%
V1
SPAR
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TA1
SPAR
E1DA
TA2
V2
DATA
1DA
TA2
SPAR
E1SP
ARE2
SPAR
E2
SPAR
E1
DATA
2
DATA
1
VPOR
TP
VPOR
TN
AUX+
SIZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
DESI
GN A
CIRC
UIT
THAT
MEE
TS C
USTO
MER-
SUPP
LIED
SPE
CIFI
CATI
ONS;
HOW
EVER
, IT R
EMAI
NS T
HE C
USTO
MER'
S RE
SPON
SIBI
LITY
TO
VERI
FY P
ROPE
R AN
D RE
LIAB
LE O
PERA
TION
IN T
HE A
CTUA
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PLIC
ATIO
N. C
OMPO
NENT
SUB
STIT
UTIO
N AN
D PR
INTE
DCI
RCUI
T BO
ARD
LAYO
UT M
AY S
IGNI
FICA
NTLY
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ECT
CIRC
UIT
PERF
ORMA
NCE
OR R
ELIA
BILI
TY. C
ONTA
CT L
INEA
RTE
CHNO
LOGY
APP
LICA
TION
S EN
GINE
ERIN
G FO
R AS
SIST
ANCE
.
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
www.
linea
r.com 1
Wedn
esda
y, Fe
brua
ry 06
, 201
32
2
LTPO
E + +
POW
ERED
DEV
ICE
KAUN
G H.
KAUN
G H.
N/A
LT42
75XI
DDSI
ZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
DESI
GN A
CIRC
UIT
THAT
MEE
TS C
USTO
MER-
SUPP
LIED
SPE
CIFI
CATI
ONS;
HOW
EVER
, IT R
EMAI
NS T
HE C
USTO
MER'
S RE
SPON
SIBI
LITY
TO
VERI
FY P
ROPE
R AN
D RE
LIAB
LE O
PERA
TION
IN T
HE A
CTUA
LAP
PLIC
ATIO
N. C
OMPO
NENT
SUB
STIT
UTIO
N AN
D PR
INTE
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ARD
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UT M
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FICA
NTLY
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UIT
PERF
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NCE
OR R
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BILI
TY. C
ONTA
CT L
INEA
RTE
CHNO
LOGY
APP
LICA
TION
S EN
GINE
ERIN
G FO
R AS
SIST
ANCE
.
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
www.
linea
r.com 1
Wedn
esda
y, Fe
brua
ry 06
, 201
32
2
LTPO
E + +
POW
ERED
DEV
ICE
KAUN
G H.
KAUN
G H.
N/A
LT42
75XI
DDSI
ZE
DATE
:
IC N
O.RE
V.
SHEE
TOF
TITL
E:
APPR
OVAL
S
PCB
DES.
APP
ENG.
TEC
HN
OLO
GY
Fax:
(408
)434
-050
7
Milp
itas,
CA 95
035
Phon
e: (4
08)4
32-1
900
1630
McC
arth
y Blvd
.
LTC
Conf
iden
tial-F
or C
usto
mer
Use
Onl
y
CUST
OMER
NOT
ICE
LINE
AR T
ECHN
OLOG
Y HA
S MA
DE A
BES
T EF
FORT
TO
DESI
GN A
CIRC
UIT
THAT
MEE
TS C
USTO
MER-
SUPP
LIED
SPE
CIFI
CATI
ONS;
HOW
EVER
, IT R
EMAI
NS T
HE C
USTO
MER'
S RE
SPON
SIBI
LITY
TO
VERI
FY P
ROPE
R AN
D RE
LIAB
LE O
PERA
TION
IN T
HE A
CTUA
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PLIC
ATIO
N. C
OMPO
NENT
SUB
STIT
UTIO
N AN
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INTE
DCI
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LAYO
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AFF
ECT
CIRC
UIT
PERF
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NCE
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TY. C
ONTA
CT L
INEA
RTE
CHNO
LOGY
APP
LICA
TION
S EN
GINE
ERIN
G FO
R AS
SIST
ANCE
.
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O LI
NEAR
TEC
HNOL
OGY
AND
SCHE
MAT
IC
SUPP
LIED
FOR
USE
WIT
H LI
NEAR
TEC
HNOL
OGY
PART
S.SC
ALE
= NO
NE
www.
linea
r.com 1
Wedn
esda
y, Fe
brua
ry 06
, 201
32
2
LTPO
E + +
POW
ERED
DEV
ICE
KAUN
G H.
KAUN
G H.
N/A
LT42
75XI
DD
R42
*R4
2*
VPOR
TPVP
ORTP
R31*
0805
R31*
0805
D11
MM
BD41
48D1
1M
MBD
4148
1 3
R29
4.3K
R29
4.3K
R24
3.6K
R24
3.6K
C5*
25V
0603
C5*
25V
0603
R21
100K
R21
100K
R45
100K
R45
100K
D15
MM
BD41
48D1
5M
MBD
4148
1 3
R32* 08
05
R32* 08
05
D5M
MSZ
5242
BSD5
MM
SZ52
42BS
21
R46
100K
R46
100K
Q3 MM
BT39
04Q3 M
MBT
3904
1
23
D8 MM
BD41
48D8 M
MBD
4148
1 3
N-CH
U3-4
FDM
Q820
3
N-CH
U3-4
FDM
Q820
3
G412
S4 10S4 11
D3_4 16
R40
4.3K
R40
4.3K
R26
3.6K
R26
3.6K
D14
MM
BD41
48D1
4M
MBD
4148
1 3
P-CH
U2-2
FDM
Q820
3
P-CH
U2-2
FDM
Q820
3
G2 4S25
S26
D1_214
Q5 MM
BT39
04Q5 M
MBT
3904
1
23
P-CH
U2-3
FDM
Q820
3
P-CH
U2-3
FDM
Q820
3
G3 9S37
S38
D3_415
D10
MM
BD41
48D1
0M
MBD
4148
1 3
D17
MM
SZ52
42BS
D17
MM
SZ52
42BS
21
R34
4.3K
R34
4.3K
Q12
MM
BT39
06Q1
2M
MBT
3906
1
2 3
R19
100K
R19
100K
R39
3.6K
R39
3.6K
R22*
0603
R22*
0603
R41
3.6KR41
3.6K
Q8*
Q8*
R37
3.6K
R37
3.6K
N-CH
U2-4
FDM
Q820
3
N-CH
U2-4
FDM
Q820
3
G412
S4 10S4 11
D3_4 16
Q10
MM
BT39
06Q1
0M
MBT
3906
1
2 3
D16
MM
BD41
48D1
6M
MBD
4148
1 3
R35
3.6K
R35
3.6K
D9 MM
BD41
48D9 M
MBD
4148
1 3
R43
100K
R43
100K
D19
MM
SZ52
42BS
D19
MM
SZ52
42BS
21
V2V2
R25
4.3K
R25
4.3K
R18
100K
R18
100K
P-CH
U3-3
FDM
Q820
3
P-CH
U3-3
FDM
Q820
3
G3 9S37
S38
D3_415
Q9 MM
BT39
06Q9 M
MBT
3906
1
2 3
R38
4.3K
R38
4.3K
R20
100K
R20
100K
V1V1
Q11
MM
BT39
06Q1
1M
MBT
3906
12 3
N-CH
U2-1
FDM
Q820
3
N-CH
U2-1
FDM
Q820
3
G11
S1 2S1 3
D1_2 13
R23
4.3K
R23
4.3K
D7M
MSZ
5242
BSD7
MM
SZ52
42BS
21
N-CH
U3-1
FDM
Q820
3
N-CH
U3-1
FDM
Q820
3
G11
S1 2S1 3
D1_2 13
R30
3.6KR3
03.
6K
Q4 MM
BT39
04Q4 M
MBT
3904
1
23
Q6 MM
BT39
04Q6 M
MBT
3904
1
23
D4M
MSZ
5242
BSD4
MM
SZ52
42BS
21
D18
MM
SZ52
42BS
D18
MM
SZ52
42BS
21
Q7*
Q7*
1
23
AUX
AUX
R44
100K
R44
100K
R36
4.3K
R36
4.3K
R27
4.3K
R27
4.3K
D13
MM
BD41
48D1
3M
MBD
4148
1 3
D12*
D12*
21
R33* 0603
R33* 0603
D6M
MSZ
5242
BSD6
MM
SZ52
42BS
21
P-CH
U3-2
FDM
Q820
3
P-CH
U3-2
FDM
Q820
3
G2 4S25
S26
D1_214
R28
3.6K
R28
3.6K
D20
MM
SZ52
42BS
D20
MM
SZ52
42BS
21
16dc1788bfa
DEMO MANUAL DC1788B
Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2012
LT 0313 REV A • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
