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AOZ7645LQI-13High Efficiency Flyback Converter
General DescriptionThe AOZ7645LQI-13 is a flyback receiver in primary sidethat targeted for power supply solution. It receives theON time information signal from secondary sideconverter to drive integrated main MOSFET in primaryside. The integrated high-voltage (HV) device providesfast start-up function.
The AOZ7645LQI-13 features include multiple protectionfunctions such as VDD under-voltage lockout, cycle-by-cycle current limit, VDD over-voltage protection,secondary rectifier short-circuit protection, current sensepin open-circuit protection and internal over-temperatureprotection.
The AOZ7645LQI-13 is available in a 6mm×6mm QFN-17L package.
Features Integrated HV start-up device Integrated with HV MOSFET 100kHz maximum start-up switching frequency VDD over-voltage protection Under-voltage lockout (6.7V/15.5V) Current sense leading edge blanking time Cycle by cycle current limit Secondary rectifier short-circuit protection CS pin open-circuit protection Internal over-temperature protection Thermally enhanced 17-pin 6x6 QFN
Applications Smart charger Adapter TV and monitor applications Open frame power supply
Function Protection Behavior
Internal OTP Auto recoveryHOCP Auto recovery
Open CS Pin Auto recoveryOpen Pro Pin LatchVPRO OVP Latch
VDD OVPLatch LatchTransmission Fail Latch
Typical Application
RXN
DRAIN
CS
PGND
VDD
HV
PRO
SOURCE
RXP TXNTXP
SOURCEDRAIN DETCSSECN
CSSECPFB
VO
VDD
TXVDDRT
Isolator
VOUT
RTN
AOZ7645
SCL SDA FTB
VBUS
GND
FTB
SDA
SCL
TONC
SGND
MGATE
CGATE
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AOZ7645LQI-13
Ordering Information
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Pin Configuration
17-Pin 6mm x 6mm QFN(Top View)
Pin Description
Part Number Ambient Temperature Range Package Environmental
AOZ7645LQI-13 -40°C to +125°C QFN 6x6A-17L Green Product
Pin Number Pin Name Pin Function
1 CS Current sense input pin.2 SGND Signal GND
3,7,8,12 SOURCE Source of the MOSFET.4 PGND Power GND.5 CGATE The gate pin of controller.6 MGATE The gate pin of the integrated MOSFET
9,10 DRAIN Drain of the integrated MOSFET.11 HV High voltage start-up current source.13 VDD The VDD is the bias-supply input pin to the controller.14 NC No connection.15 PRO Protection pin.16 RXN ON time information receiver pin.17 RXP ON time information receiver pin.
1
7
5
4
3
2
8
17 111213141516
9
10
HV
SO
UR
CE
VD
D
NC
PR
O
RX
N
RX
P
SOURCE
SOURCE
SOURCE
CS
SGND
CGATE
PGND DRAIN
DRAIN
6MGATE
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AOZ7645LQI-13
Absolute Maximum RatingsExceeding the Absolute Maximum Ratings may damage thedevice.
Notes:
1. Devices are inherently ESD sensitive, handling precautions are required. Human body model rating: 1.5kΩ in series with 100pF.
2. 1x1inch, 2-layer PCB, follow JEDEC standard.
Recommended Operating ConditionsThe device is not guaranteed to operate beyond the MaximumRecommended Operating Conditions.
Parameter Rating
VHV -0.3V to 500VVDRAIN -0.7V to 700VVDD,VCGATE -0.3V to 40VVCS, VRXP, VRXN, VPRO -0.3V to 7VVMGATE -0.3V to 20VJunction Temperature (TJ) +150°CStorage Temperature (TS) -65°C to +150°CESD HBM(1) 4kVESD CDM(1) 1kV
Parameter Rating
Supply Voltage (VDD) 8V to 33VAmbient Temperature (TA) -40°C to +125°CPackage Thermal Resistance 25°C/W(2)
Electrical CharacteristicsVDD=15V, TA = -25°C to 85°C, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
MOSFET
RDS(ON) ON State Resistance Static, IDRAIN = 1A, VDD = 10V, TJ = 25°C 0.6 0.75 ΩHVIHV Supply Current from HV Pin VHV = 100V, VDD = 0V, converter OFF 3.6 4.8 mAIHV_LC Leakage Current from HV Pin VHV = 500V, VDD = 18V, converter ON 0.8 µAVDD
VDD_OVP VDD Over-Voltage Protection Level 34 36 38.2 V
tD_OVPVDD Over-Voltage Protection Debounce Time(1) 20 µs
VDD_ON Turn-ON Threshold Voltage 14.0 15.5 17.0 VVDD_UVLO Turn-OFF and Under Voltage Lock Out 6.2 6.7 7.2 VIDD_OP Operation Current VDD = 15V, converter ON, fS = 80kHz 0.6 1.2 1.8 mAIDD_SKIP Skip Mode Operation Current VDD = 7V 500 550 µA
IDD_DIS Disable Mode Operation Current VDD = 15V, VDD_OVP is enabled or no GATE output 90 150 µA
Frequency
fOSC Start-up Operation FrequencyVPRO = 1V 100 kHz
fOSC1 VPRO = 0.5V 50 kHzProtection Function
VPRO_MIN Min. Clamp Voltage IPRO = -0.1mA 0.1 0.2 0.25 VVDISH Disable Voltage Level (High) 1.4 1.5 1.6 VtDISHBN Blanking Time 0.6 0.8 1 µstDISHDB VDISH Debounce Cycles 4 CyclesGate Drive
VG_CLAMP GATE Clamping Voltage VDD = 15V 12 VtLEB Leading Edge Blanking Time 300 350 420 nstPD Propagation Delay Time 50 100 ns
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AOZ7645LQI-13
Soft-start
tSS_OFF Soft-Start Time for Shut Down 18 24 mstSS_CS Soft-Start Time for Current Limit 5 7 9 msCurrent LIMIT
VCSLGeneral Continuous Operation Limited Current Sense Level IPRO = 120µA 285 300 315 mV
VCSH Fast Over Current Protection Limit 0.75 VtOCPH Fast OCP for Auto Restart VCS > 750mV and happening continuous 4 CyclesReceiver
tRDDelay Time for RX Rising Signal to GATE ON 100 ns
tFDDelay Time for RX Falling Signal to GATE OFF 100 ns
Over temperature protection
TSD Thermal Shutdown TJ Rising 145 °C
TSDRThermal Shutdown Recovery Threshold TJ Falling 125 °C
Electrical Characteristics (Continued)VDD=15V, TA = -25°C to 85°C, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
Rev. 1.0 March 2020 www.aosmd.com Page 4 of 11
AOZ7645LQI-13
Functional Block Diagram
BIAS
DriverLogic
PRO Detection
Circuit
OVP Detection
Current Limit
HV VDD
RXP
RXN
UVLO
Reset and Shutdown Logic
OTP
VDD
Fault
Receiver
SGND
Latch Function
Drain
Source
Fault
PGND CGATE MGATE
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AOZ7645LQI-13
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Typical Characteristics
Figure 1. Soft Start Time for Current Limit vs. Temperature
Figure 2. Soft Start Time for Shut Downvs. Temperature
Figure 3. Gate Clamping Voltage vs. Temperature Figure 4. Minimum of the Start-up Operation Frequency vs. Temperature
Figure 5. Maximum of the Start-up Operation Frequency vs. Temperature
Figure 6. Minimum of the Turn-on Period vs. Temperature
TS
S_
CS
(m
S)
Temperature (°C)
-40 5 80 125
9
8.5
8
7.5
7
6.5
6
5.5
5-25 -10 20 35 50 65 95 110
TS
S_
OF
F (
mS
)
Temperature (°C)
-40 5 80 125
24
22
20
18
16
14
12-25 -10 20 35 50 65 95 110
VG
_CL
AM
P (V
)
Temperature (°C)
-40 5 80 125
12.3
12.2
12.1
12
11.9
11.8
11.7-25 -10 20 35 50 65 95 110
f OS
C1
(kH
z)
Temperature (°C)
-40 5 80 125
55
54
53
52
51
50
49
48
47
46
45
-25 -10 20 35 50 65 95 110
f OS
C (k
Hz)
Temperature (°C)
-40 5 80 125
105
104
103
102
101
100
99
98
95-25 -10 20 35 50 65 95 110
96
97
TP
D+
TL
EB
(ns
)
Temperature (°C)
-40 5 80 125-25 -10 20 35 50 65 95 110
490
470
450
430
410
390
370
350
AOZ7645LQI-13
Rev. 1.0 March 2020 www.aosmd.com Page 7 of 11
Typical Characteristics
Figure 7. Leading Edge Blanking Time vs. Temperature
Figure 8. The Blanking Time of the Disable Voltage Level vs. Temperature
Figure 9. General Continuous Operation Current Sense Limit vs. Temperature
Figure 10. VDD Over-Voltage Protection Levelvs. Temperature
Figure 11. Turn-OFF and Under Voltage Lock Out vs. Temperature
Figure 12. Turn-ON Threshold Voltage vs. Temperature
t LE
B(n
s)
Temperature (°C)
-40 5 80 125
400
390
380
370
360
350
340
330
320
310
300-25 -10 20 35 50 65 95 110
t DIS
HB
N(µ
s)
Temperature (°C)-40 5 80 125
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6-25 -10 20 35 50 65 95 110
VC
SL
(mV
)
Temperature (°C)
-40 5 80 125
315
310
305
300
295
290
285-25 -10 20 35 50 65 95 110
VD
DO
VP
(V)
Temperature (°C)
-40 5 80 125
38
37.5
37
36.5
36
35.5
35
34.5
34-25 -10 20 35 50 65 95 110
UV
LO
(V
)
Temperature (°C)
-40 5 80 125
7.2
7.1
7
6.9
6.8
6.7
6.6
6.5
6.4-25 -10 20 35 50 65 95 110
VD
D_
ON
(V)
Temperature (°C)
-40 5 80 125
17
16.5
16
15.5
15
14.5
14-25 -10 20 35 50 65 95 110
AOZ7645LQI-13
Rev. 1.0 March 2020 www.aosmd.com Page 8 of 11
Detailed Description
HV Start-Up
There is a high-voltage (HV) device which isdesigned as a current source to charge the VDDcapacitor during start-up. This current source willbe turned off for reducing the power consumptionafter the AOZ7645LQI-13 is powered on. The HVpin should be connected to the input terminalsthrough the rectifier diodes and a series resistor,the series resistor is recommended to be 10kΩ.
Soft Start
The AOZ7645LQI-13 has an internal soft startfeature to limit inrush current and ensure the outputvoltage ramps up smoothly to the regulationvoltage. If the AOZ7645LQI-13 never receives theON time information from the secondary sideconverter, the AOZ7645LQI-13 will be shut downafter 18ms (tSS_OFF) from start-up.
ON Time Receiver
The AOZ7645LQI-13 receives the ON timeinformation from the secondary side converterthrough the RXP and RXN pins and send the ONtime signal to the driver. The ON time width of theswitching pulse varies according to the ON timesignal.
VDD Over-Voltage Protection
The output voltage can be sensed roughly from theVDD pin. When the VDD voltage exceeds the VDDOVP level (VDD_OVP), the converter will be shutdown after the VDD OVP debounce time (tD_OVP)and then return to the start state.
PRO Protection
The output voltage can be sensed indirectly bymonitoring the auxiliary winding voltage. When thePRO voltage during turn-off period exceeds thePRO disable voltage level (VDISH), the converterwill be shut down after the VDISH debounce cycles(tDISHDB) and then return to the start state.
Cycle-by-Cycle Current Limit
The AOZ7645LQI-13 detects the primary currentthrough CS pin, and the CS peak voltage of eachswitching cycle is limited to VCSL. The voltageacross the current-sensing resistor RCS is fed intothe CS pin for current limit detection.
When the fault occurs due to transformer shortcircuit or secondary rectifier short circuit, and the
large current will flow through the main MOSFET atturn-on period, and this will cause damage onpower components. In order to protect the system,Fast over current protection function is added. Ifthe CS voltage reaches VCSH, the converter will beshut down after four consecutive cycles and thenreturn to the start state.
CS Pin Open-Circuit Protection
The CS pin features open-loop protection to passthe CS pin single fault testing. When the CS pin isopened, the CS will be pulled high by internalcircuit and CS pin voltage will higher than VCSHand the converter will be shut down after fourconsecutive cycles and then return to the startstate.
Over-Temperature Protection
The AOZ7645LQI-13 provides an internal OTPprotection function. If the junction temperaturereaches the OTP threshold, the AOZ7645LQI-13will stop switching until the junction temperaturedecreases below the OTP recovery temperature.
AOZ7645LQI-13
Rev. 1.0 March 2020 www.aosmd.com Page 9 of 11
Package Dimensions, QFN6x6A-17L, EP1_S
RECOMMENDED LAND PATTERN
UNIT: mmNOTECONTROLLING DIMENSION IS MILLIMETER. CONVERTED INCH DIMENSIONS ARE NOT NECESSARILY EXACT.
PIN#1 DOT BY MARKING
D
EA
1A
A
0.00
0
1.535
1.3402.700
2.700
0.0000.125
0.125
2.60
02.
250
2.20
0
2.50
0
1.51
3
1.38
0
0.33
0
2.70
0
2.25
0
0.50
0
0.25
0
1.6252.600
0.625
2.200
A2
0.2501.340
3.150
3.1502.825
2.600
3.15
0
C 0.25
E5L1
L2 LD2
eb
E2
D1
E1
E4
L3
D3
E3
L4
L5
D4D5
D6
D7
D8
E7
E6
1
18
b1
AOZ7645LQI-13
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Tape and Reel, QFN6x6A-17L, EP1_S
AOZ7645LQI-13
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Part Marking
Part No. Description Code
AOZ7645LQI-13 Green Product AYLD
Part Number Code
Assembly Lot CodeYear Code & Week Code
AOZ7645LQI-13(6mm x 6mm QFN)
P N X O
Y W L T
1. Life support devices or systems are devices orsystems which, (a) are intended for surgical implant intothe body or (b) support or sustain life, and (c) whosefailure to perform when properly used in accordancewith instructions for use provided in the labeling, can bereasonably expected to result in a significant injury ofthe user.
2. A critical component in any component of a lifesupport, device, or system whose failure to perform canbe reasonably expected to cause the failure of the lifesupport device or system, or to affect its safety oreffectiveness.
LIFE SUPPORT POLICY
ALPHA AND OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.As used herein:
LEGAL DISCLAIMER
Applications or uses as critical components in life support devices or systems are not authorized. AOS does not assume any liability arising out of such applications or uses of its products. AOS reserves the right to make changes to product specifications without notice. It is the responsibility of the customer to evaluate suitability of the product for their intended application. Customer shall comply with applicable legal requirements, including all applicable export control rules, regulations and limitations.
AOS' products are provided subject to AOS' terms and conditions of sale which are set forth at:http://www.aosmd.com/terms_and_conditions_of_sale