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MOSFET driver for synchronous rectification supports CCM, DCM, and QR operation

Diodes has introduced the APR348,a secondary-side, multi-mode synchronous rectification MOSFET driver designed for AC-DC rectification circuits in general consumer applications, notebooks, and USB adapters.

The APR348 is capable of driving the external MOSFET in both high-side and low-side secondary-side synchronous-rectifier configurations. Flexible and efficient, the device supports secondary-side output voltages up to 20V in continuous conduction mode (CCM), discontinuous conduction mode (DCM), and quasi-resonant (QR) flyback modes.

Manufacturers often choose an external MOSFET when implementing synchronous rectification as it provides greater efficiency converters. As the APR348 requires very few additional external components, engineers can still deliver extremely small and efficient power supply designs that meet the demands of the consumer sector.

A key design feature of the APR348 is fast turn-on and turn-off times, which reduces power loss and ensures safe operation when in CCM mode. The device also features a blanking period to set the minimum turn-on period for the MOSFET; this significantly improves performance by limiting the impact of voltage ringing.

The APR348 also features a light load (LL) mode, which uses an internal timer to skip cycles when there is no load or only a light load detected at the output. This design delivers lower standby power at no load. In addition, high-side switching does not require an additional transformer winding, reducing the bill of materials cost.

Author
Neil Tyler

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