STMicroelectronics EVLCMB1-90WADP

Overview

EVLCMB1-90WADP from STMicroelectronics is an evaluation board for a 90 W dual-stage AC-DC power supply featuring integrated PFC and LLC resonant control, built around the STCMB1 combo controller (SO20W) and SEA05L CV/CC LED driver, with full safety-rated isolation via SFH617A-4 optocoupler and EMI-compliant common-mode choke (L1) and X/Y capacitors.

For engineers reviewing the EVLCMB1-90WADP datasheet, EVLCMB1-90WADP pinout, EVLCMB1-90WADP application, or EVLCMB1-90WADP equivalent, this board enables rapid validation of high-efficiency, low-THD, constant-voltage/constant-current LED driver designs compliant with IEC 61000-3-2 Class C and EN 55022 Class B emission limits.

Technical Context

The board implements a two-stage architecture: an active boost PFC stage (U1 STCMB1) operating in transition mode (TM) with >98% efficiency at full load, followed by an isolated LLC resonant DC-DC stage (T1, 600 µH, 170 kHz) delivering regulated 19 V output. Input range is 85–265 V_AC, with peak efficiency of 92.5% at 230 V_AC/90 W.

Control is fully integrated: U1 handles PFC voltage loop, LLC frequency modulation, and overvoltage/overcurrent protection; U2 provides secondary-side CV/CC regulation with analog dimming interface; isolation feedback uses U3 SFH617A-4 with CTR ≥100% and V_ISO = 5.3 kV_RMS.

Key Specifications

Availability

EVLCMB1-90WADP is available at Aetrix Electronics and suitable for LED lighting systems, industrial signage drivers, and medical-grade auxiliary power supplies requiring stable component supply, design verification under real-world line conditions, and compliance-ready reference implementation.

Supply support for EVLCMB1-90WADP 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, power ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

This board belongs to ST's "STCMB" family of integrated PFC+LLC controllers, engineered specifically for compact, high-power-density, safety-certified AC-DC LED drivers targeting UL 8750 and IEC 62368-1 compliance.

FAQ

What is the primary function of the EVLCMB1-90WADP evaluation board?

The EVLCMB1-90WADP is a fully assembled, safety-isolated evaluation platform for validating 90 W AC-DC LED driver designs using ST's STCMB1 PFC+LLC combo controller and SEA05L secondary-side CV/CC regulator. It demonstrates complete system behavior-including THD, efficiency, startup timing, and fault response-under real input line and load conditions.

Can the board be modified for different output voltages or currents?

Yes - output voltage is set by resistive divider R11/R46 on U2's FB pin; current limit is adjusted via R80 (6 mΩ sense resistor) and U2's ISENSE configuration. The transformer T1 (600 µH, 19 V) and feedback optocoupler U3 are fixed, but secondary winding taps or alternate transformers can be substituted following ST Application Note AN4762.

Does EVLCMB1-90WADP include FCC or CE certification documentation?

The board itself is not certified as a final product, but it is pre-aligned to meet EN 55022 Class B conducted/radiated emissions and IEC 61000-3-2 Class C harmonic limits. Full certification requires end-product-level testing; ST provides test reports, layout files, and EMI debug guidelines in UM2277 (User Manual).

What safety certifications does the board support out-of-the-box?

The board implements reinforced isolation per IEC 62368-1: creepage/clearance ≥8 mm between primary and secondary, Y1 capacitors (C20/C21), 5.3 kV_RMS optocoupler (U3), and double-insulated transformer T1. It satisfies basic insulation requirements for UL 8750 (LED equipment) and IEC 61347-2-13 (LED drivers), pending end-product construction review.