APR34709

Document number: DS41354 Rev. 5 - 3

1 of 13

www.diodes.com

June 2022

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APR34709

SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER

Description

The

DIODES™ APR34709 is a secondary side Combo IC, which

combines an N-Channel MOSFET and a driver circuit designed for

Synchronous Rectification (SR), supports DCM and Quasi-Resonant

Flyback Topologies.

The N-Channel MOSFET is optimized for low gate charge, low

RDS(ON), fast switching speed and body diode reverse recovery

performance.

The synchronous rectification can effectively reduce the secondary

side rectifier power dissipation and provide high performance solution.

By sensing MOSFET drain-to-source voltage, the APR34709 can

output ideal drive signal with less external components.

It can provide high performance solution for 3.3V to 15V output

voltage application.

The APR34709 is available in SO-8EP package.

Features

•

Synchronous Rectification for DCM Operation Flyback

•

Eliminate Resonant Ring Interference

•

Fast Detector of Supply Voltages

•

Fewest External Components



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)



For automotive applications requiring specific change

control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP

capable, and manufactured in IATF 16949 certified facilities),

please contact us or your local Diodes representative.

https://www.diodes.com/quality/product-definitions/

Pin Assignments

SO-8EP

1

2

3

4

8

7

6

5

DRISR

VDET

AREF

VCC

DRAIN

GND

GND

VDD

Top View

Note: The DRAIN pin of internal MOSFET is exposed PAD, which is at the bottom

of IC (the dashed box). The secondary current should flow from GND (pins 7 and

8) to this exposed PAD.

Applications

•

Adapters/chargers for cell/cordless phones, ADSL modems, MP3

and other portable apparatus

•

Standby and auxiliary power supplies

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-

free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and

Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

NOT RECOMMENDED FOR NEW DESIGN

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