SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER - Diodes
Description
NEW PRODUCT
APR34709
SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER
Description
The APR34709 is a secondary side Combo IC, which combines an NChannel 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.
Pin Assignments
(Top View)
AREF 1 DRISR 2
VDD 3 VCC 4
8 GND 7 GND 6 VDET 5 DRAIN
It can provide high performance solution for 3.
3V to 15V output voltage application.
The APR34709 is available in SO-8EP package.
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.
SO-8EP
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)
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.
Typical Applications Circuit
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