STMicroelectronics STEVAL-ISA132V1

Overview

STEVAL-ISA132V1 from STMicroelectronics is an evaluation board implementing a single-stage 24 V, 170 W continuous / 300 W peak LLC resonant converter without PFC, based on the L6699 controller, STB13N60M2 600 V/11 A MDmesh™ M2 MOSFETs, and STPS20H100CG dual 10 A Schottky rectifier. It operates from 190–264 VAC input, achieves >92% efficiency at 230 VAC full load, and meets EN55022 Class-B and EN60950-1.

For engineers reviewing the STEVAL-ISA132V1 datasheet, STEVAL-ISA132V1 pinout, STEVAL-ISA132V1 application, or STEVAL-ISA132V1 equivalent, key selection criteria include its LLC topology validation capability, thermal-limited peak power delivery (300 W), burst-mode low-noise operation, adaptive dead-time control, and pre-compliant EMI performance in a 90 × 90 mm form factor.

Technical Context

The board implements a self-oscillating LLC resonant half-bridge architecture using the L6699 dual-gate driver with integrated adaptive dead-time adjustment and anti-capacitive mode protection. Startup employs a "safe-start" sequence to prevent hard switching under varying line/load conditions.

Thermal management relies on an NTC sensor near output diodes to enable time-limited 300 W peak operation, while burst mode activation below light load ensures <0.6 W no-load consumption and eliminates audible noise during restart transitions.

Key Specifications

Availability

STEVAL-ISA132V1 is available at Aetrix Electronics and suitable for LLC topology validation, high-efficiency AC-DC adapter development, and industrial 24 V power supply qualification requiring stable component supply and repeatable thermal test platforms.

Supply support for STEVAL-ISA132V1 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, designing and manufacturing microcontrollers, power devices, analog ICs, and silicon solutions for automotive, industrial, and consumer markets.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series, purpose-built to accelerate design-in of ST's proprietary power controllers (e.g., L6699), MDmesh™ MOSFETs, and high-current Schottky diodes in resonant converter topologies.

FAQ

What is the maximum continuous output power of the STEVAL-ISA132V1 under standard conditions?

The STEVAL-ISA132V1 delivers 170 W continuous output power at 24 V when operated at 30 °C ambient temperature and within the 190–264 VAC input range. This rating reflects thermal equilibrium with natural convection cooling and accounts for derating of the STPS20H100CG diodes and STB13N60M2 MOSFETs per their respective SOA curves.

Does the board include power factor correction (PFC)?

No, the STEVAL-ISA132V1 implements a single-stage LLC resonant converter without active or passive PFC. It is designed for applications where high efficiency and compact size are prioritized over unity power factor, such as enclosed industrial power supplies where input current distortion is managed at system level.

How does the "safe-start" feature prevent hard switching?

The L6699 controller executes a controlled soft-start sequence that ramps gate drive frequency from above resonance downward, ensuring zero-voltage switching (ZVS) initiation. This avoids simultaneous conduction in the half-bridge MOSFETs and eliminates voltage/current stress spikes during power-up across line and load variations.

Can the board be used for EMI pre-compliance testing?

Yes - the STEVAL-ISA132V1 meets conducted emissions limits per EN55022 Class-B without additional filtering, making it suitable for early-stage EMI pre-compliance verification. Layout, snubber design, and transformer shielding have been optimized to suppress common-mode noise paths typical in LLC converters.