APR348

Document number: DS42016 Rev. 5 - 2

2 of 9

www.diodes.com

March 2021

© Diodes Incorporated

APR348

Typical Applications Circuit

VOUT

VCC

GND

Rx

VDD

DRISR VDET

APR348

Q1

Q2

R1

C1

C2

VOUT

VCC

GND

Rx

VDD

DRISR

VDET

APR348

Q1

R1

C1

Q2

C2

High-Side Application

Low-Side Application

Pin Descriptions

Pin Number

Pin Name

Function

1

VCC

Internal Linear Regulator Input

2

GND

Ground, also used as FET source sense reference for VDET

3

Rx

External fixed resistor for Accurate Turn-On Signal

4

VDD

Linear Regulator Output. It provides bias voltage for the internal logic circuit and the MOSFET driver.

Connect this pin to a capacitor.

5

DRISR

Synchronous Rectification MOSFET Gate Drive

6

VDET

Synchronous Rectification MOSFET Drain Voltage Sense Input

Functional Block Diagram

VCC

VDET

VDET

Power

Management

VCC

Power

Management

VDD

VDET

Sensing

Control

Core

Rx

SR

Driver

Power

ON/OFF

VREF/

IBIAS

DRISR

GND

6

3

2

5

4

1