APR343 Datasheet, PDF (1/12 Pages) Diodes Incorporated – SECONDARY SIDE SYNCHRONOUS RECTIFICATION CONTROLLER

A Product Line of
Diodes Incorporated
APR343
SECONDARY SIDE SYNCHRONOUS RECTIFICATION CONTROLLER
Description
Pin Assignments
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
(Top View)
DRISR 1
GND 2
VCC 3
5 VDET
4 AREF
Applications
SOT25
 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)
 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
T1
+
C20
Q2
C22
R21
5
1
3
VDET DRISR VCC
APR343
AREF
4
R20
GND
2
R22
C21
APR343
Document number: DS36884 Rev. 4 - 2
1 of 12
www.diodes.com
December 2014
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