STMicroelectronics EVL6562A-400W

Overview

EVL6562A-400W from STMicroelectronics is an evaluation board implementing a 400 W, wide-input (90–265 Vac), fixed-off-time (FOT) controlled boost PFC pre-regulator using the L6562A controller. It delivers regulated 400 Vdc output with ≤10 V_pk-pk 2f_L ripple, 22 ms hold-up time to 300 V, and ≥90% efficiency at 90 Vac full load - targeting ATX PSUs and flat-panel display power supplies.

For engineers reviewing the EVL6562A-400W datasheet, EVL6562A-400W schematic, EVL6562A-400W application, or EVL6562A-400W equivalent, this board enables rapid validation of FOT-based TM PFC design at 400 W using cost-optimized control architecture, compliance verification against EN61000-3-2 Class D and JEITA-MITI, and thermal/EMI performance assessment under real-world line and load conditions.

Technical Context

The EVL6562A-400W implements a continuous conduction mode (CCM) boost PFC stage driven by the L6562A in Fixed-Off-Time control mode - enabling stable high-power operation without requiring complex current-sense compensation or high-bandwidth error amplifiers. This architecture avoids the instability and component count penalties typical of conventional transition-mode controllers at >250 W.

It integrates a custom PQ40+30 ferrite boost inductor (500 µH, 1 mm gap), dual STP12NM50FP MOSFETs in interleaved gate drive configuration, and comprehensive EMI filtering (CM choke L1, DM choke L3, X2/Y2 capacitors). Input rectification uses D15XB60 bridge and STTH8R06 ultrafast diode; output holds 400 Vdc for ≥22 ms after AC loss.

Key Specifications

Availability

EVL6562A-400W is available at Aetrix Electronics and suitable for ATX power supply units, flat-panel display power systems, and industrial auxiliary power supplies requiring stable component supply, pre-validated PFC reference design, and regulatory compliance documentation.

Supply support for EVL6562A-400W 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer applications.

The EVL6562A-400W belongs to ST's Power Management Evaluation Board portfolio, developed to accelerate adoption of its L6562A FOT PFC controller in cost-sensitive, high-efficiency AC-DC front-end designs up to 500 W.

FAQ

What is the primary purpose of the EVL6562A-400W evaluation board?

The EVL6562A-400W is a fully assembled, tested reference design for a 400 W active PFC pre-regulator using ST's L6562A controller in Fixed-Off-Time mode. It demonstrates how to achieve Class-D harmonic compliance, high efficiency, and robust hold-up performance in compact form factor - not a production-ready module but a design validation tool for engineers building AC-DC power supplies.

Does this board include the L6562A IC, and what package is used?

Yes, the board integrates one L6562A IC in SO-8 package (U1), as confirmed in the Bill of Material (Table 2, page 7). The SO-8 footprint is standard and compatible with reflow soldering; no adapter or socket is required. All supporting components - including ZCD sensing network, COMP compensation, and GD gate driver circuitry - are optimized per ST's AN2042 application note.

Can the EVL6562A-400W be modified for different output voltages or power levels?

Output voltage is set by resistive divider R10/R11 (510 kΩ each) feeding the INV pin of U1 and is factory-trimmed for 400 Vdc. Scaling to 380 V or 420 V requires recalculating that divider per L6562A's 2.5 V reference. Power scaling beyond 400 W is not recommended due to thermal limits of the PQ40 inductor (L4), STP12NM50FP MOSFETs, and 330 µF/450 V bulk capacitor - all selected for 400 W continuous operation at 50 °C ambient.

Is EMI filter design documented, and does it meet Class B without external modifications?

Yes - the board includes complete common-mode (L1, C1/C3/C13) and differential-mode (L3, C4/C5/C6) filtering, validated per EN55022 Class B in the "Typical performance" section (pages 4–5). Layout follows ST's recommended creepage/clearance rules, and no external filter additions are needed for compliance when operated within specified input range (90–265 Vac) and ambient temperature (≤50 °C).