PWM Controller for Programmable Power Converter (USBPD)

The RT7755GEF series is specifically designed to work with controllers, such as the RT7206, to provide a total solution for USB PD or a programmable power adapter. This RT7755GEF not only provides a high power efficiency control scheme, but also gives a 50mW very low standby power control under 5V standby condition.

The RT7755GEF is such a special design to achieve a wide-range of output voltage by utilizing several innovations, including (1) By using DMAG pin, the RT7755GEF senses output voltage to adjust loop gain for system stability, to adjust output overvoltage protection threshold voltage to protect external devices, and to adjust current limit to meet Limited Power Source (LPS) safety requirements; (2) The RT7755GEF is also equipped with comprehensive protection features, including bulk-capacitor brown-in/brown-out protection, VDD overvoltage protection (VDD OVP), output overvoltage/undervoltage protection (Output OVP/UVP), secondary rectifier short-circuit protection (SRSP), and external over-temperature protection (External OTP); (3) For constant output power regulation, a resistor connected to CS pin can be used to achieve accurate line compensation across the universal input voltage range; and (4) The RT7755GEF also provides various features to protect against any failures occurring at the secondary-side component, such as the RT7206 or a shunt regulator.

In applications, it is suggested that the RT7755GEF be used with a secondary controller RT7206 to realize a robust and safe design to prevent all potential fault conditions due to misconnection of various devices, cables, plugs and receptacles.