AOZ7635QI-03High Efficiency Flyback Converter

General DescriptionThe AOZ7635QI-03 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 AOZ7635QI-03 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 AOZ7635QI-03 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 (6.8V/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

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Typical Application

RXN

DRAIN

CS

PGND

VDD

HV

PRO

SOURCE

RXP TXNTXP

SOURCEDRAIN DETCSSECN

CSSECPFB

VO

VDD

TXVDDRT

Isolator

VOUT

RTN

AOZ7635

SCL SDA FTB

VBUS

GND

FTB

SDA

SCL

TONC

SGND

MGATE

CGATE

AOZ7635QI-03

Ordering Information

AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.

Pin Configuration

Pin Description

Part Number Ambient Temperature Range Package Environmental

AOZ7635QI-03 -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

SOURCE

VDD

NC

PRO

RXN

RXP

SOURCE

SOURCE

SOURCE

CS

SGND

CGATE

PGND DRAIN

DRAIN

6MGATE

17-Pin 6mm x 6mm QFN(Top View)

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AOZ7635QI-03

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 500V

VDRAIN -0.7V to 700V

VDD,VCGATE -0.3V to 40V

VCS, VRXP, VRXN, VPRO -0.3V to 7V

VMGATE -0.3V to 20V

Package Power Dissipation TBD

Junction Temperature (TJ) +150°C

Storage Temperature (TS) -65°C to +150°C

ESD HBM(1) 4kV

ESD CDM(1) 1kV

Parameter Rating

Supply Voltage (VDD) 8V to 33V

Ambient Temperature (TA) -40°C to +125°C

Package 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 0.9 1.15 Ω

HV

IHV Supply Current from HV Pin VHV = 100V, VDD = 0V, converter OFF 1.0 2.0 mA

IHV_LC Leakage Current from HV Pin VHV = 500V, VDD = 18V, converter ON 0.8 µA

VDD

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 V

VDD_UVLO Turn-OFF and Under Voltage Lock Out 6.2 6.7 7.2 V

IDD_OP Operation Current VDD = 15V, converter ON, fS = 80kHz 1.2 1.5 1.8 mA

IDD_SKIP Skip Mode Operation Current VDD = 7V 500 550 µA

IDD_DIS Disable Mode Operation CurrentVDD = 15V, VDD_OVP is enabled or no GATE output

70 100 µA

FREQUENCY

fOSCStart-up Operation Frequency

VPRO = 1V 100 kHz

fOSC1 VPRO = 0.5V 50 kHz

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AOZ7635QI-03

Note:

3. Guaranteed by design.

PROTECTION FUNCTION

VPRO_MIN Min. Clamp Voltage IPRO = -0.1mA 0.15 0.2 0.25 V

VDISH Disable Voltage Level (High) 1.4 1.5 1.6 V

tDISHBN Blanking Time 0.6 0.8 1 µs

tDISHDB VDISH Debounce Cycles 4 Cycles

GATE DRIVE

VG_CLAMP GATE Clamping Voltage VDD = 15V 12 V

TLEB Leading Edge Blanking Time 300 350 400 ns

TPD Propagation Delay Time 50 100 ns

SOFT-START

TSS_OFF Soft-Start Time for Shut Down 18 24 ms

TSS_CS Soft-Start Time for Current Limit 5 7 9 ms

CURRENT LIMIT

VCSLGeneral Continuous Operation Limited Current Sense Level IPRO = 120µA 285 300 315 mV

VCSH Fast Over Current Protection Limit 0.75 V

TOCPH Fast OCP for Auto Restart VCS > 750mV and happening continuous 4 Cycles

RECEIVER

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

Thermal Shutdown TJ Rising 145 °C

OTPRECThermal 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

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AOZ7635QI-03

Functional Block Diagram

BIAS

DriverLogic

PRO Detection Circuit

OVP Detection

Current Limit

HV VDD

PRO

CS

PGND CGATE

RXP

RXN

DRAIN

UVLO

Fault

OTP

VDD

Fault

Transmitter&

Receiver

LDO

SGND MGATE

SOURCE

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AOZ7635QI-03

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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_C

S (

mS

)

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_O

FF

(m

S)

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 (

kHz)

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

490

470

450

430

410

390

370

350-25 -10 20 35 50 65 95 110

AOZ7635QI-03

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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 (

ns)

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 (

µs

)

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

AOZ7635QI-03

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Detailed Description

HV Start-Up

There is a high-voltage (HV) device which is designed asa current source to charge the VDD capacitor duringstart-up. This current source will be turned off forreducing the power consumption after the AOZ7635QI-03 is powered on. The HV pin should be connected to theinput terminals through the rectifier diodes and a seriesresistor, the series resistor is recommended to be 10kΩ.

Soft Start

The AOZ7635QI-03 has an internal soft start feature tolimit inrush current and ensure the output voltage rampsup smoothly to the regulation voltage. If the AOZ7635QI-03 never receives the ON time information from thesecondary side converter, the AOZ7635QI-03 will be shutdown after 16ms (tSS_OFF) from start-up.

ON Time Receiver

The AOZ7635QI-03 receives the ON time informationfrom the secondary side converter through the RXP andRXN pins and send the ON time signal to the driver. TheON time width of the switching pulse varies according tothe ON time signal.

VDD Over-Voltage Protection

The output voltage can be sensed roughly from the VDDpin. When the VDD voltage exceeds the VDD OVP level(VDD_OVP), the converter will be shut down after the VDDOVP debounce time (tD_OVP) and then return to the startstate.

PRO Protection

The output voltage can be sensed indirectly bymonitoring the auxiliary winding voltage. When the PROvoltage during turn-off period exceeds the PRO disablevoltage level (VDISH), the converter will be shut downafter the VDISH debounce cycles (tDISHDB) and thenreturn to the start state.

Cycle-by-Cycle Current Limit

The AOZ7635QI-03 detects the primary current throughCS pin, and the CS peak voltage of each switching cycleis limited to VCSL. The voltage across the current-sensingresistor RCS is fed into the CS pin for current limitdetection.

When the fault occurs due to transformer short circuit orsecondary rectifier short circuit, and the large current willflow through the main MOSFET at turn-on period, andthis will cause damage on power components. In order toprotect the system, Fast over current protection functionis added. If the CS voltage reaches VCSH, the converterwill be shut down after four consecutive cycles and thenreturn to the start state.

CS Pin Open-Circuit Protection

The CS pin features open-loop protection to pass the CSpin single fault testing. When the CS pin is opened, theCS will be pulled high by internal circuit and CS pinvoltage will higher than VCSH and the converter will beshut down after four consecutive cycles and then returnto the start state.

Over-Temperature Protection

The AOZ7635QI-03 provides an internal OTP protectionfunction. If the junction temperature reaches the OTPthreshold, the AOZ7635QI-03 will stop switching until thejunction temperature decreases below the OTP recoverytemperature.

AOZ7635QI-03

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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

AOZ7635QI-03

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Tape and Reel, QFN6x6A-17L, EP1_S

AOZ7635QI-03

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Part Marking

Part No. Description Code

AOZ7635QI-03 Green Product AP03

Part Number Code

Assembly Lot CodeYear Code & Week Code

AOZ7635QI-03(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