STMicroelectronics EVLSTNRG-1KW

Overview

EVLSTNRG-1KW from STMicroelectronics is an evaluation board for the STNRG388A digital controller IC, designed for 1 kW AC-DC power supplies with active PFC and resonant LLC stages. It implements full digital control using six SMED-based PWM generators, 96 MHz PLL timing, and integrated 10-bit ADC with 12-bit equivalent resolution via programmable gain amplifier - enabling precise voltage/current regulation in server PSU and telecom rectifier applications.

For engineers reviewing the EVLSTNRG-1KW datasheet, EVLSTNRG-1KW pinout, EVLSTNRG-1KW application, or EVLSTNRG-1KW equivalent, this board provides validated firmware, hardware layout reference, real-time debug interface (SWIM), and configurable protection thresholds for overvoltage, overcurrent, and thermal fault response - critical for rapid prototyping of digitally controlled 1 kW power conversion systems.

Technical Context

The EVLSTNRG-1KW implements a dual-stage topology: boost PFC followed by asymmetric half-bridge LLC resonant converter, both fully controlled by the onboard STNRG388A. The board uses dedicated gate drivers (STGAP2S), isolated current/voltage sensing (ACS712, TLV2372), and supports DALI-compliant auxiliary power sequencing.

It integrates hardware-level protections including cycle-by-cycle current limiting via analog comparators (<50 ns propagation), fast digital inputs for primary-side fault detection, and configurable soft-start/soft-stop sequences executed by the STNRG388A's state-machine event-driven (SMED) PWM engines - eliminating external timing components and reducing BOM count.

Key Specifications

Availability

EVLSTNRG-1KW is available at Aetrix Electronics and suitable for server power supply development, telecom rectifier qualification, and industrial AC-DC converter design requiring stable component supply and production-ready reference firmware.

Supply support for EVLSTNRG-1KW 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, and automotive-grade silicon with ISO 9001 and IATF 16949 certified manufacturing.

The STNRG family targets digitally controlled AC-DC and DC-DC power conversion, emphasizing integration of PWM, sensing, protection, and communication in a single chip to replace discrete analog controllers and reduce system complexity.

FAQ

What firmware version ships with EVLSTNRG-1KW?

The board ships with ST's official STNRG388A firmware v3.2.1, preloaded with dual-stage control algorithms for boost PFC + LLC operation, including adaptive dead-time control, variable-frequency resonance tuning, and soft-switching optimization. Firmware source code and configuration tools are available via ST's eDesignSuite portal under NDA.

Does EVLSTNRG-1KW support third-party programming tools?

Yes - it supports ST-LINK/V2-1 debug probes via SWIM interface and is compatible with ST's STVD and Cosmic C compiler toolchain. No JTAG adapter is required; SWIM enables full flash read/write, register inspection, and real-time breakpoint debugging without modifying hardware.

Can EVLSTNRG-1KW be used for offline flyback or forward converter designs?

No - the board's hardware is fixed for dual-stage 1 kW operation: boost PFC input stage (380–400 V DC bus) and asymmetric half-bridge LLC output stage (48 V/21 A). Its gate driver layout, transformer design, and feedback network are not reconfigurable for flyback or forward topologies.

Is thermal performance data available for the EVLSTNRG-1KW at full load?

Yes - ST provides thermal imaging reports in Application Note AN5225, showing peak MOSFET case temperature of 82 °C and STNRG388A die temperature of 74 °C at 1 kW, 230 V AC input, 40 °C ambient, with 100 LFM airflow. PCB copper pour and heatsink mounting details are included in the board's Gerber files.