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 such a special design to support a wide output voltage range of 3V to 22V, and especially a HV LDO is built-in for the MOSFET gate driver at low output voltage.

Furthermore, the RT7220A offers a Green Mode operation, in light load condition, by which the RT7220A counts the gate pulse of MOSFET to determine the timing for entering green mode and to reduce operation current under 160μA.

应用

Travel Adapters with Fast Charge Protocols (e.g., FCP, SCP, AFC and QC2.0/QC3.0)

Travel Adapters with USB PD Type-C Control

Netcom Adapters

关键特性

Suitable for High/Low-Side SR Control of Flyback in CCM, DCM and Quasi-Resonant Mode

Suitable for 3V to 22V VOUT Range

<1.2mA Operating Current in Normal Mode (Without SR Driver)

<160μA Operating Current in Green Mode

Built-in HV LDO to Supply SR Driver when VOUT Lower than 5V

Automatic Tracking Control to Optimize Efficiency

300kHz Maximum Operation Frequency

Protection

SR Gate Driver with 6V Clamp

SR Gate Initial Output Low Clamping Voltage before Start-Up

Optional Minimum Period Protection

Optional SR Minimum Off-Time

VG Fast Turn-Off (The Total Delay is Less than 35ns)