STMicroelectronics EVAL6562-375W

Overview

EVAL6562-375W from STMicroelectronics is an evaluation board designed to demonstrate the L6562 transition-mode PFC controller in high-efficiency, IEC61000-3-2-compliant AC-DC power supplies up to 375W. It implements a continuous conduction mode (CCM)-assisted TM boost pre-regulator with 400V DC output, <9.2% THD at 265VAC full load, and >96% efficiency at 220VAC/375W, using STP12NM50 MOSFET and custom boost inductor.

For engineers reviewing the EVAL6562-375W datasheet, EVAL6562-375W pinout, EVAL6562-375W application, or EVAL6562-375W equivalent, this board provides validated reference design data-including measured PF >0.915, OVP threshold accuracy ±1.2%, THD optimizer waveform validation, and thermal performance on 7°C/W heatsink-for rapid prototyping of EN61000-3-2 Class D-compliant 300–375W SMPS in desktop PCs, monitors, and entry-level servers.

Technical Context

The EVAL6562-375W implements a single-stage, transition-mode (TM) boost PFC pre-regulator controlled by the L6562 IC, featuring proprietary THD optimization circuitry that reduces zero-crossing conduction dead-angle via dynamic multiplier offset. Its input stage accepts universal AC (85–265VAC), delivers regulated 400VDC output, and integrates active OVP with dual static/dynamic thresholds (2.25V ±0.15V and 40µA ±3µA).

Board-level design includes a 7°C/W heatsink for STP12NM50, 0.33Ω current-sense resistor, 750kΩ/1.5MΩ feedback divider, and optimized EMI filter (B82732 47mH + B81133 X2 caps). The L6562's totem-pole gate driver (−600/+800mA) directly drives the MOSFET without external buffer, while its 1% internal 2.5V reference enables precise output regulation across −40°C to +125°C junction temperature.

Key Specifications

Availability

EVAL6562-375W is available at Aetrix Electronics and suitable for desktop PC power supplies, industrial AC-DC adapters, and entry-level server front-end designs requiring stable component supply, fast design validation, and compliance-ready PFC reference implementation.

Supply support for EVAL6562-375W 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, delivering silicon solutions for automotive, industrial, and power applications since 1987.

The EVAL6562 series belongs to ST's Power Management Evaluation Platform product line, engineered to accelerate time-to-market for energy-efficient, regulatory-compliant AC-DC conversion systems targeting IEC61000-3-2 and Energy Star certification.

FAQ

What is the maximum validated output power of EVAL6562-375W?

The EVAL6562-375W board is fully characterized and validated at 375W continuous output power with 400VDC output, achieving >96% efficiency and PF >0.915 at 220VAC/265VAC full load. Thermal measurements confirm MOSFET junction temperature remains below 85°C with the provided 7°C/W heatsink under these conditions.

Does EVAL6562-375W support universal AC input?

Yes. EVAL6562-375W accepts 85–265VAC input without hardware modification, leveraging the L6562's extended VCC range (10.3–22V), wide-input multiplier (0–3V linear range), and THD optimizer circuit that maintains <9.2% THD across the full mains range, meeting IEC61000-3-2 Class D requirements.

How is overvoltage protection implemented on this board?

EVAL6562-375W uses the L6562's dual-mode OVP: dynamic OVP triggers at 40µA ±3µA error amplifier output current (corresponding to ~40V overvoltage), while static OVP activates when COMP pin saturates low during no-load or light-load conditions. Both modes force gate drive low and reduce quiescent current to <2.2mA to preserve hold-up time.

Can EVAL6562-375W be modified for different output voltages?

Yes-output voltage is set by the R1/R2 feedback divider on pins INV and GND. To change from 400VDC, recalculate R1 = ∆Vo / 40µA and R2 = R1 × 2.5 / (Vo − 2.5); for example, 380V requires R1 = 950kΩ and R2 = 6.34kΩ. The L6562's 1% reference and OVP current tolerance ensure ±1.2% absolute OVP accuracy across all valid Vo settings.