STMicroelectronics STEVAL-USBPD45C

Overview

STEVAL-USBPD45C from STMicroelectronics is a 45 W USB Power Delivery 3.0-compliant AC-DC adapter reference design with single Type-C source port, universal 90–264 VAC input, and three fixed PDOs (5 V/3 A, 9 V/3 A, 15 V/3 A). It implements flyback topology with adaptive synchronous rectification, achieves >50% efficiency at 250 mW load, and meets CoC v5 Tier 2 and DOE standby power requirements (<35 mW).

For engineers reviewing the STEVAL-USBPD45C datasheet, STEVAL-USBPD45C pinout, STEVAL-USBPD45C application, or STEVAL-USBPD45C equivalent, this reference design supports rapid validation of USB PD 3.0 firmware stack (X-CUBE-USB-PD), high-efficiency flyback control (STCH03 + STM32F051), and certified Type-C port management (STUSB1602A) in compact 73×51×25 mm form factor.

Technical Context

The design splits functionality across two boards: STEVAL-USBPD45P handles primary-side flyback conversion using STCH03 PWM controller and STF7N80K5 800 V MOSFET, while STEVAL-USBPD45I hosts STM32F051 MCU and STUSB1602A to execute USB PD 3.0 protocol, manage VBUS enable/discharge, and drive synchronous rectification via STL40N75LF3.

Adaptive SR control is implemented directly by the STM32F051 using real-time VDS sensing and load feedforward, eliminating external gate drivers. ESD protection exceeds IEC61000-4-2 Level 4 (>30 kV on VBUS, >20 kV on CC lines), and surge immunity reaches 35 A (8/20 µs) per IEC61000-4-5.

Key Specifications

Availability

STEVAL-USBPD45C is available at Aetrix Electronics and suitable for USB PD 3.0 reference validation, embedded power supply qualification, and industrial USB-C adapter development requiring stable component supply and full-stack firmware integration.

Supply support for STEVAL-USBPD45C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power devices, and sensors for automotive, industrial, and consumer applications.

This reference design belongs to ST's USB Power Delivery ecosystem, built to accelerate time-to-market for certified, high-efficiency USB-C adapters using ST's integrated controllers (STUSB1602A), MCUs (STM32F051), and power semiconductors (STF7N80K5, STL40N75LF3).

FAQ

Does STEVAL-USBPD45C support programmable PDOs or only fixed profiles?

No, STEVAL-USBPD45C implements only three fixed PDOs (5 V/3 A, 9 V/3 A, 15 V/3 A) as defined in its hardware configuration and X-CUBE-USB-PD firmware. It does not support variable or programmable PDOs - the power rules are hard-coded to comply with USB PD 3.0 Source Fixed Supply definition.

What firmware is preloaded and how is it updated?

The STM32F051 MCU ships with STSW-USBPD45CFW firmware, which integrates X-CUBE-USB-PD stack and is PD 3.0 certified. Firmware updates are performed via SWD interface using ST-LINK/V2 or compatible debuggers; no bootloader or UART-based update mechanism is implemented on this board.

Can the STEVAL-USBPD45C be modified to support sink functionality?

No - the hardware is source-only: VBUS_EN_SRC is active, VBUS_EN_SNK is unpopulated and not routed, and the STUSB1602A is configured exclusively for source mode. The PCB lacks sink-side power path components (e.g., load switch for VBUS discharge during role swap), making sink operation electrically and firmware-incompatible.

Is the 45 W rating sustained across all output voltages?

Yes - the design delivers rated 3 A continuously at 5 V, 9 V, and 15 V, verified under thermal limits (70°C case temperature). At 15 V, full 45 W output requires ≥90% efficiency in flyback stage and ≤2.5 W loss in SR MOSFET and controller, achieved via adaptive gate timing and low-R_DS(on) STL40N75LF3.