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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. <br /><br />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. <br /><br />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.<br /><br />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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RT7220A Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Suitable for High/Low-Side SR Control of Flyback in CCM, DCM and Quasi-Resonant Mode </li><li>Suitable for 3V to 22V V<sub>OUT</sub> Range </li><li><1.2mA Operating Current in Normal Mode (Without SR Driver) </li><li><160μA Operating Current in Green Mode </li><li>Built-in HV LDO to Supply SR Driver when V<sub>OUT</sub> Lower than 5V </li><li>Automatic Tracking Control to Optimize Efficiency </li><li>300kHz Maximum Operation Frequency </li><li>Protection <ul class="lv2"> <li></li><li>SR Gate Driver with 6V Clamp </li><li>SR Gate Initial Output Low Clamping Voltage before Start-Up </li><li>Optional Minimum Period Protection </li><li>Optional SR Minimum Off-Time </li><li>VG Fast Turn-Off (The Total Delay is Less than 35ns) </li></ul> </li></ul></div>
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RT7220A Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Travel Adapters with Fast Charge Protocols (e.g., FCP, SCP, AFC and QC2.0/QC3.0) </li><li>Travel Adapters with USB PD Type-C Control </li><li>Netcom Adapters </li></ul></div>
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