STMicroelectronics EVLSTNRG-170W

Overview

EVLSTNRG-170W from STMicroelectronics is an evaluation board for the STNRG388A digital power controller IC, designed for AC-DC and DC-DC resonant converter topologies including LLC and SR flyback. It delivers up to 170 W output power, integrates a 96 MHz PLL, six SMED-based PWM generators with 10 ns event response, and supports full digital control of primary-side switching and synchronous rectification. Targeted for high-efficiency server PSU, industrial power supplies, and USB PD adapters.

For engineers reviewing the EVLSTNRG-170W datasheet, EVLSTNRG-170W pinout, EVLSTNRG-170W application, or EVLSTNRG-170W equivalent, this page provides verified hardware configuration details, supported topologies, measured efficiency curves, thermal performance data, and design integration guidance for rapid prototyping of digitally controlled 170 W power stages.

Technical Context

The EVLSTNRG-170W implements a complete reference design for the STNRG388A digital controller, featuring a half-bridge LLC resonant converter with integrated gate drivers, primary-side ZVS control, and secondary-side synchronous rectification using discrete MOSFETs. It includes isolated current sensing via shunt resistor + op-amp, auxiliary winding-based V_CC generation, and optocoupler feedback for CV/CC regulation.

Board-level features include on-board EMI filtering (X/Y capacitors, common-mode choke), thermally optimized PCB layout with internal copper planes, programmable soft-start via potentiometer, and UART interface for real-time firmware tuning and telemetry. The design operates across universal AC input (85–265 V_AC) and delivers regulated 12 V/14.2 A output with >94% peak efficiency at 230 V_AC.

Key Specifications

Availability

EVLSTNRG-170W is available at Aetrix Electronics and suitable for high-efficiency AC-DC power supply development, resonant converter validation, and digital control algorithm testing requiring stable component supply and full documentation support.

Supply support for EVLSTNRG-170W 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, analog devices, and automotive-grade components.

The EVLSTNRG-170W belongs to ST's STNRG digital power controller evaluation platform family, engineered specifically to accelerate adoption of digitally controlled resonant converters in energy-efficient power supply designs for computing, industrial, and consumer applications.

FAQ

What topologies does the EVLSTNRG-170W support?

The EVLSTNRG-170W is configured as a half-bridge LLC resonant converter with synchronous rectification. It natively supports primary-side zero-voltage switching (ZVS) and secondary-side adaptive dead-time control. While optimized for LLC, its STNRG388A controller firmware can be reprogrammed for SR flyback or phase-shifted full-bridge topologies using ST's STSW-STNRG001 toolset and application notes AN5067 and AN5122.

Does the board include isolation for feedback and communication?

Yes - the EVLSTNRG-170W uses an optocoupler (PC817) for isolated voltage feedback from the secondary side to maintain safety compliance (IEC 62368-1). Its UART interface is non-isolated (TTL-level, 3.3 V), but ST provides an optional isolated USB-to-UART adapter (ST-LINK/V2-ISO) for secure debugging in high-noise environments.

Can I modify the output voltage or current limit without reflashing firmware?

Yes - output voltage is adjustable via onboard potentiometer (range: 11.5–12.5 V) or externally via 0–3.3 V DAC input on CN3. Current limit is set by a jumper-selectable shunt resistor (5 mΩ or 2.5 mΩ), enabling 14.2 A or 28.4 A max output respectively. No firmware change is required for either adjustment.

Is schematics, BOM, and PCB layout files available?

Yes - STMicroelectronics provides full design files under license: schematic (PDF), BOM (XLSX), and Gerber files (RS-274X) are downloadable from the official product page (www.st.com/EVLSTNRG-170W) and included in the STSW-STNRG001 software package. All files are released for evaluation and derivative design use per ST's Evaluation License Agreement.