Addressing the need for higher integration and efficiency in portable chargers, Diodes Incorporated has introduced two synchronous rectifiers: the APR3415 and APR34330. These devices combine a driver circuit with an internal MOSFET to provide cost effective rectification with reduced power dissipation and using fewer external components. Target applications include adapters/chargers for cellular and cordless phones, ADSL modems, MP3 players, and similar portable consumer products and home appliances.
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The APR3415 and APR34330 are synchronous rectification switchers for 5V output-voltage applications operating in discontinuous conduction mode. Synchronous rectification can reduce secondary-side power dissipation, while the devices’ ability to sense the MOSFET drain-to-source voltage enables an optimized drive signal using fewer external components. The internal N-channel MOSFET has been optimized for low gate charge, low RDS(ON), fast switching speed and reverse recovery, which helps these devices provide a fast response to secondary-side voltage and can also improve the transient performance of a primary-side control system.
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