APR34709

Document number: DS41354 Rev. 5 - 3

2 of 13

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June 2022

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APR34709

Typical Applications Circuit

+

C21

+

C22

APR34709

VCC

AREF

DRAIN

DRAIN

GND

GND

VDET

DRISR

RAREF

C23

R21

C24

VDD

CAREF

C23

Pin Descriptions

Pin Number

Pin Name

Function

1

AREF

Program a voltage reference with a resistor from AREF to GND, to enable synchronous

rectification MOSFET drive signal.

2

DRISR

Synchronous rectification MOSFET drive.

3

VDD

Internal power supply. It provides bias voltage for the internal logic circuit and the MOSFET

driver. Connect this pin to a capacitor.

4

VCC

Power supply, connected with system output.

Input of internal LDO and system output voltage sensing circuit.

5

DRAIN

Drain pin of internal MOSFET. The drain voltage signal can be obtained from this pin.

6

VDET

Synchronous rectification sense input and dynamic function output, connected to DRAIN

through a resistor.

7, 8

GND

Source pin of internal MOSFET, connected to Ground.

Exposed PAD

DRAIN

Drain pin of internal MOSFET. The secondary current should flow from GND (pins 7 and 8)

to this DRAIN pad.