PWM Controller for Programmable Power Converter (USBPD)

The RT7752GxP series with Quasi-Resonant mode (QR) is specifically designed to work with controllers, such as the RT7202, to provide a total solution for USB PD or a programmable power adapter. The RT7752GxP can achieve high efficiency, meet safety standards, and consume less than 50mW of power in a 5V standby condition.

The RT7752GxP includes several innovations in order to provide a solution with a wide range of output voltage. By utilizing the DMAG pin, the RT7752GxP senses output voltage to adjust loop gain for system stability, to adjust output over-voltage protection threshold voltage for protection of external devices, and to adjust current limit to meet Limited Power Source (LPS) safety requirements.

The RT7752GxP is also equipped with comprehensive protection features, including Bulk-Capacitor brown-in /brown-out protection, VDD over-voltage protection (VDD OVP), output over-voltage/under-voltage protection (Output OVP/UVP), secondary rectifier short-circuit protection (SRSP), and external over-temperature protection (External OTP). 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. The RT7752GxP also provides various features to protect against failures occurring at the secondary-side component, such as the RT7202 or a shunt regulator.

The RT7752GxP and the RT7202 work together to realize a robust and safe design to prevent all the potential fault scenarios, which may arise from versatile and unknown connections to various devices, cables, plugs and receptacles.