APR343

Document number: DS36884 Rev. 4 - 2

1 of 12

www.diodes.com

December 2014

© Diodes Incorporated

APR343

A Product Line of

Diodes Incorporated

SECONDARY SIDE SYNCHRONOUS RECTIFICATION CONTROLLER

Description

APR343 is a secondary side MOSFET driver for synchronous

rectification in DCM operation, which integrates the output voltage

detection function for primary side control system.

The synchronous rectification can effectively reduce the secondary

side rectifier power dissipation and provide high performance solution.

By sensing MOSFET drain-to-source voltage, APR343 can output

ideal drive signal with less external components. It can provide high

performance solution for 5V output voltage application.

Same as AP4341, APR343 detects the output voltage and provides a

periodical signal when the output voltage is lower than a certain

threshold. By fast response to secondary side voltage, APR343 can

effectively improve the transient performance of primary side control

system.

The APR343 is available in SOT25 package.

Features



Synchronous Rectification for DCM Operation Flyback



Eliminate Resonant Ring Interference



Fast Detector of Supply Voltage



Fewest External Components



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



Halogen and Antimony Free.

“Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

3

4

5

DRISR

GND

VCC

AREF

VDET

SOT25

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) compliant.

2. See http://www.diodes.com/quality/lead_free.html

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.

Typical Applications Circuit

+

R20

C21

C20

GND

VDET

DRISR

VCC

AREF

T1

Q2

R21

R22

C22

APR343

5

1

3

4

2