STMicroelectronics introduces reference designs that support energy efficient Power Delivery and PPS

     STMicroelectronics has introduced a USB Type-C Power Delivery 3.0 reference design that supports programmable power supplies (PPS) with a maximum output power of 27W and zero power consumption without connecting a charging cable to accelerate easy-to-use, small, and efficient power adapter design. USB PPS helps save power, reduce device charging time and heat dissipation, and reduce bill of materials costs on the device side.

     The STEVAL-USBPD27S reference design integrates the STM32G071 microcontroller (MCU), the state-of-the-art PWM controller STCH03, and the TCPP01-M12 USB Type-C protection IC, among which, The STM32G071 integrates a fully functional USB Type-C Power Delivery controller in a single chip. This reference design allows users to quickly develop a USB fast charging source adapter that meets the Level 4 minimum average operating energy efficiency and standby power consumption of less than 40mW as specified in the European CoC V5 Tier-2 energy efficiency standard and the US energy efficiency standard DOE Level VI.

     The STM32G071 MCU handles the functions of the entire digital control section, including the sub-side VBUS voltage control algorithm, as well as ST's proprietary adaptive synchronous rectification algorithm, which improves charging efficiency. VBUS control algorithm conforms to USB Type-C power supply and PPS specifications, and realizes cable voltage drop compensation to accurately control the power supply voltage. PPS can gradually adjust the output voltage value between 3.3V-11V in 20mV steps and the current limit value in 50mA steps to minimize the power conversion loss during charging.

     As an McU-based solution, the reference design provides users with additional design flexibility to implement additional customer-specific application layers, introducing upgrades and improvements to the USB Power Delivery standard.

     The power stage of the STEVAL-USBPD27S circuit board uses ST's highly integrated STCH03 PWM controller with built-in high voltage start circuit, constant current output regulation on the primary side and advanced power management functions. Designed as a quasi-resonant zero-voltage switch (ZVS) flyback converter, STCH03 ensures high energy efficiency, ultra-low standby power consumption and excellent dynamic performance.

     STD7N65M6 MDmesh M6 Primary side High Voltage STPOWER MOSFET optimizes switching performance in both soft and hard switching modes, resulting in extremely high energy efficiency for application designs.

     Finally, the TCPP01-M12 provides ±8kV ESD electrostatic discharge protection for USB VBUS pins and configuration channel (CC) pins, complying with IEC 61000-4-2 Level 4 safety requirements. There is also short circuit protection between VBUS pins and CC pins, as well as protection against equipment damage caused by misuse of broken wires.