AOZ7645LQI-13 · HV PRO SOURCE RXP TXP TXN DRAIN DET SOURCE CSSECN CSSECP FB VO VDD TXVDD RT...

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

Rev. 1.0 March 2020 www.aosmd.com of 11

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


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


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


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


AOZ7645LQI-13


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


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


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


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


Tape and Reel, QFN6x6A-17L, EP1_S

AOZ7645LQI-13


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

AOZ7645LQI-13 · HV PRO SOURCE RXP TXP TXN DRAIN DET SOURCE CSSECN CSSECP FB VO VDD TXVDD RT...

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Transcript of AOZ7645LQI-13 · HV PRO SOURCE RXP TXP TXN DRAIN DET SOURCE CSSECN CSSECP FB VO VDD TXVDD RT...