The RT7220A is a high performance Synchronous Rectifier (SR) controller for flyback converters operating in Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM) and Quasi-Resonant (QR) mode. This SR controller senses the drain voltage of MOSFET to determine SR gate on/off so as to minimize turn-off dead-time and enhance efficiency.
The RT7220A is designed to support a wide output voltage range of 3V to 22V, and an HV LDO is especially built-in for the MOSFET gate driver to operate at low output voltage.
Furthermore, the RT7220A offers a Green Mode operation, in light load condition, in which the RT7220A counts the gate pulse of MOSFET to determine the timing for entering green mode and to reduce operation current under 160μA.
The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 105°C.
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