A Product Line of
Diodes Incorporated
APR34309C
SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER
Description
Pin Assignments
NEW PRODUCT
APR34309C is a secondary side Combo IC, which combines an NChannel MOSFET and a driver circuit designed for synchronous
rectification (SR) in DCM operation. It also integrates output voltage
detect function for primary side control system.
(Top View)
The N-Channel MOSFET has been 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, APR34309C can output
ideal drive signal with less external components. It can provide high
performance solution for 5V output voltage application.
Same as AP4341, APR34309C 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,
APR34309C can effectively improve the transient performance of
primary side control system.
1
8
GND
VDET
2
7
GND
AREF
3
6
GND
VCC
4
5
DRAIN
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(pin 6,7,8) to
this exposed PAD.
SO-8EP
Applications
The APR34309C 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
DRISR
•
Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3
and Other Portable Apparatus
Standby and Auxiliary Power Supplies
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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
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