STMicroelectronics EVL400W-80PL

Overview

EVL400W-80PL from STMicroelectronics is a 12 V / 33 A (400 W) AC/DC demonstration board implementing a two-stage architecture: CCM boost PFC using L4985A and LLC resonant half-bridge using L6699D, with synchronous rectification via SRK2001. It delivers >89% full-load efficiency (80 PLUS Platinum), <150 mW no-load consumption at 230 Vac, and meets EN61000-3-2 Class-D harmonics and EN55022 Class-B EMI standards.

For engineers reviewing the EVL400W-80PL datasheet, EVL400W-80PL pinout, EVL400W-80PL application, or EVL400W-80PL equivalent, this board serves as a validated reference design for high-efficiency, wide-input (90–264 Vac), low-light-load AC/DC adapters targeting server power supplies, industrial computing, and energy-sensitive embedded systems.

Technical Context

The board implements a front-end Continuous Conduction Mode (CCM) boost PFC stage controlled by the L4985A - a peak-current-mode controller featuring a proprietary THD-optimized multiplier emulator and quasi-fixed-frequency operation enabled by an off-time modulator. Its integrated high-voltage startup and X-cap discharge circuitry reduce external component count.

The downstream LLC resonant converter uses the L6699D double-ended controller to regulate output voltage via variable-frequency modulation; its self-adaptive deadtime logic, synchronized to half-bridge node transitions, maximizes transformer magnetizing inductance and minimizes primary current under light load - directly enabling >50% efficiency at 250 mW.

Key Specifications

Availability

EVL400W-80PL is available at Aetrix Electronics and suitable for server power supply development, industrial PC power design, and energy-efficient embedded adapter qualification requiring stable component supply, pre-validated topology implementation, and regulatory-compliant reference data.

Supply support for EVL400W-80PL 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

This demonstration board belongs to ST's "EVAL" series of application-specific reference designs - engineered to accelerate time-to-market for high-efficiency AC/DC power conversion by providing fully tested schematics, layout files, BOMs, and compliance documentation.

FAQ

What is the primary purpose of the EVL400W-80PL?

The EVL400W-80PL is a complete, assembled 400 W AC/DC demonstration board intended for evaluation and design-in of high-efficiency, wide-input-range power supplies. It validates ST's two-stage PFC + LLC architecture with synchronous rectification and provides all necessary documentation, test data, and layout guidance for rapid prototyping.

Which STMicroelectronics ICs are integrated on this board?

The board integrates three key ST ICs: the L4985A CCM boost PFC controller on the primary control board, the L6699D LLC resonant half-bridge controller also on the primary control board, and the SRK2001 synchronous rectifier driver on the secondary control board - each selected for optimized efficiency and light-load performance.

Does the board include safety and EMC certification documentation?

Yes - the EVL400W-80PL design complies with EN60950 safety standard and meets EN55022 Class B conducted/radiated emissions limits. The official data brief (DB4742 Rev 2) includes test reports, schematic diagrams, BOMs, and layout guidelines required for derivative product certification.

Can this board be used for production-level power supply manufacturing?

No - the EVL400W-80PL is a demonstration and evaluation board, not a certified production module. While its design is production-ready and transferable, users must perform full safety, EMC, and reliability validation on their own PCB layout and mechanical implementation before commercial deployment.