Secondary-side MOSFET driver cuts costs in aux. 5-12V PSUs

Secondary-side MOSFET driver cuts costs in aux. 5-12V PSUs

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The APR345 secondary-side MOSFET driver (Diodes Inc.) is positioned as the smallest available, lowest BOM cost solution for synchronous rectification in 5V to 12V power supplies.
By Graham Prophet


This device is suitable for line-powered adapters and chargers for consumer products such as smartphones and tablets, PVRs and IPTV boxes, cable and xDSL modems, datacom equipment and other portable consumer/home appliances, providing power conversion for standby and auxiliary power supplies.


In conjunction with an external MOSFET, the APR345 driver provides synchronous secondary-side rectification control that supports various flyback circuit topologies operating in CCM, DCM and quasi-resonant modes. By sensing the external MOSFET’s drain-to-source voltage and driving the MOSFET to reduce the voltage drop, the APR345 reduces power dissipation and improves overall system efficiency. It is packaged in SOT26 and needs a minimum of external components; it is priced at $0.37 (1000).





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