PDF《AOZ7648QI-06》

Rev.

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24 AOZ7648QI-06 Secondary Side Control Super Transient Response Converter General Description The AOZ7648QI-06 is a secondary side control flyback converter with super transient control scheme. It supports I2C command for fine accuracy adjustable constant voltage regulation and constant current regulation function. A proprietary constant ON time (COT) control with input feed-forward compensation for fast transient response and good stability. The device features include multiple protection functions such as VDD under-voltage lockout (UVLO), output under-voltage protection (UVP), output over-voltage protection (OVP) and internal over-temperature protection (OTP). The AOZ7648QI-06 is available in a 6mm*6mm QFN- 38L package. Features ? Secondary side CV/CC control ? 145kHz maximum switching frequency ? Constant ON time control with feed-forward compensation ? No loop compensation components required ? Fast output voltage transient response ? Include SSCG (Spread Spectrum Clock Generator) function ? Self-check path of TX/RX transmission function ? Integrated synchronous rectifier ? Include I2C communication Function ? Output under-voltage and over-voltage protection ? Internal over-temperature protection ? Thermally enhanced 38-pin 6x6 QFN Applications ? Smart charger ? Adapter ? TV and monitor applications ? Open frame power supply Typical Application RXN DRAIN CS PGND VDD HV PRO SOURCE RXP TXN TXP SOURCE DRAIN DET CSSECN CSSECP FB VO VDD TXVDD RT Isolator VOUT RTN AOZ7648 SCLSDA FTB VBUS GND FTB SDA SCL TONC SGND MGATE CGATE AOZ7648QI-06 Rev. 1.0 January

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24 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 Part Number Ambient Temperature Range Package Environmental AOZ7648QI-06 -40°C to +125°C QFN 6X6-38L Green Product

24 23

22 21

20 28

29 27

25 26

33 32

37 38

36 34

35 16

17 11

12 18

19 13

15 14

6 7

8 9

10 2

1 3

5 4

31 30 TXP TXN TXVDD VDD TONC SDA FTB SCL FB SGND GATE GATE VO CPG Source Source CPS PGND SGND Drain Drain Source Source Source Source Source Source Drain Drain Drain Source CSSECN CSSECP DET SGND RT Source Source 38-Pin 6mmx6mm QFN (Top View) AOZ7648QI-06 Rev. 1.0 January

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24 Pin Description Pin Number Pin Name Pin Function

1 FTB Fault bar for fault protection signal output.

2 SDA I2 C data signal.

3 SCL I2 C clock signal. 4, 14,

34 SGND Signal ground.

5 FB Feedback input pin.

6 TXP ON time information transmitter pin.

7 TXN ON time information transmitter pin.

8 TXVDD Output of 3.8V linear regulator. The TXVDD is the supply pin to the transmission circuitry.

9 VDD The VDD is the bias-supply pin to the controller.

10 TONC On time compensation.

11 VO Output voltage sensing pin and supports converter power.

12 CPG Connect to the gate of load switch N-type MOSFET.

13 CPS Connect to the source of load switch N-type MOSFET.

15 PGND Power ground. 16,

17 GATE Gate driver output for synchronous rectifier MOSFET. 18, 19, 20, 21, 22, 27, 28, 29, 30, 31,

32 SOURCE Source of the synchronous rectifier MOSFET. 23, 24, 25, 26,

33 DRAIN Drain of the synchronous rectifier MOSFET.

35 RT External thermal protection setting.

36 DET The drain voltage of SR MOSFET detection pin.

37 CSSECN Current sense pin.

38 CSSECP Current sense pin. AOZ7648QI-06 Rev. 1.0 January