STMicroelectronics STEVAL-ISA147V2

Overview

STEVAL-ISA147V2 from STMicroelectronics is an evaluation board designed to demonstrate the STM32F334R8 microcontroller in high-resolution digital power control applications. It integrates a 72 MHz Arm® Cortex®-M4 core with FPU, 64 KB Flash, 16 KB SRAM, and the HRTIM1 peripheral delivering 217 ps timing resolution across 10 PWM channels - enabling precise gate driving for resonant LLC and PFC topologies.

For engineers reviewing the STEVAL-ISA147V2 datasheet, STEVAL-ISA147V2 pinout, STEVAL-ISA147V2 application, or STEVAL-ISA147V2 equivalent, this board serves as a validated reference for digital power supply design, HRTIM-based PWM synchronization, isolated current/voltage sensing integration, and real-time control loop implementation using STM32's analog peripherals (3× DACs, 3× comparators, 1× op-amp).

Technical Context

The board implements a complete 150 W digitally controlled AC-DC adapter based on the STM32F334R8 MCU, leveraging its integrated HRTIM1 for dual-phase interleaved PFC and resonant half-bridge LLC control with hardware fault protection (5 fault inputs) and synchronous event chaining. The design uses the MCU's dedicated analog front-end - including rail-to-rail comparators, programmable gain amplifier, and 12-bit DACs - to close voltage and current loops without external signal conditioning.

It supports full system-level debugging via SWD and includes isolated gate drivers (STGAP2S), reinforced isolation for feedback paths, and configurable current-sense amplifiers (TSC102) with selectable gain. All critical timing paths - from ADC sampling to PWM update - are synchronized within the HRTIM's deterministic latency window (<100 ns jitter).

Key Specifications

Availability

STEVAL-ISA147V2 is available at Aetrix Electronics and suitable for digital power supply development, industrial SMPS validation, and embedded power controller prototyping requiring stable component supply and production-ready reference designs.

Supply support for STEVAL-ISA147V2 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, specializing in microcontrollers, power management ICs, sensors, and automotive-grade solutions.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series, purpose-built to accelerate adoption of STM32 digital power control capabilities - specifically targeting high-efficiency, high-frequency switched-mode power supplies with real-time adaptive regulation.

FAQ

Does STEVAL-ISA147V2 support firmware updates over USB or UART?

No. The board lacks onboard USB-to-serial or bootloader circuitry. Firmware is programmed exclusively via the SWD interface using ST-LINK/V2 or compatible debug probes. No UART-based DFU or USB CDC functionality is implemented - all code deployment and debugging require SWD connection and STM32CubeIDE or Keil µVision.

Can the HRTIM outputs on STEVAL-ISA147V2 drive MOSFETs directly?

No. HRTIM outputs are logic-level (3.3 V CMOS) and must interface with external gate drivers. The board uses STGAP2S isolated gate drivers to translate HRTIM PWM signals into high-current, level-shifted gate drive capable of driving 600 V GaN or SiC MOSFETs with fast turn-on/turn-off and active Miller clamping.

What is the maximum switching frequency supported by the PFC stage on this board?

The interleaved boost PFC stage operates up to 200 kHz, constrained by the HRTIM's minimum pulse width (≈2 ns) and gate driver slew rate. At 200 kHz, the design maintains >96% efficiency at full load with THD <5% and meets EN 61000-3-2 Class D harmonic limits.

Is the STEVAL-ISA147V2 compliant with safety standards for production use?

The board is a development tool, not a certified end-product. It implements reinforced isolation and creepage/clearance per IEC 62368-1 for evaluation purposes only. For production, users must perform full safety certification (UL/EN 62368-1, IEC 60950-1) on their final system, including layout review, transformer validation, and insulation testing.