STMicroelectronics EVL90WADP-LLCSR

Overview

EVL90WADP-LLCSR from STMicroelectronics is a 90 W LLC resonant converter demonstration board for high-end portable computer power supplies, featuring universal AC input (90–264 Vac), 19 V/4.75 A regulated DC output, >92% peak efficiency at 115 Vac, <260 mW no-load consumption, and ENERGY STAR® EPA rev. 2.0 compliance.

For engineers reviewing the EVL90WADP-LLCSR datasheet, EVL90WADP-LLCSR application, EVL90WADP-LLCSR bill of material, or EVL90WADP-LLCSR equivalent, this board serves as a validated reference design integrating L6563H PFC controller, L6599A LLC resonant controller, and SRK2000A synchronous rectification driver for high-efficiency secondary-side power delivery.

Technical Context

The board implements a two-stage architecture: an active PFC front-end using the L6563H (operating in transition mode) delivers a regulated 400 V bus to an LLC resonant half-bridge stage controlled by the L6599A, which employs fixed 50% duty cycle and variable-frequency control up to 130 kHz.

Synchronous rectification on the center-tapped secondary is managed by the SRK2000A, sensing drain-source voltage (DVS1/DVS2) to precisely time MOSFET gate drive, reducing conduction losses versus diode rectification and enabling heatsink elimination at 90 W.

Key Specifications

Availability

EVL90WADP-LLCSR is available at Aetrix Electronics and suitable for high-efficiency AC-DC adapter development, ENERGY STAR®-certified power supply qualification, and LLC resonant topology validation requiring stable component supply and reference-grade performance data.

Supply support for EVL90WADP-LLCSR 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 specializing in power management, analog, MCU, and automotive ICs, with over 45 years of innovation in energy-efficient power conversion solutions.

This demonstration board belongs to ST's Power Supply Evaluation Platform product line, designed to accelerate adoption of high-efficiency resonant topologies in notebook adapters, ultra-slim power supplies, and eco-design-compliant external power supplies.

FAQ

What is the primary purpose of the EVL90WADP-LLCSR board?

The EVL90WADP-LLCSR is a fully assembled, tested reference design demonstrating a 90 W LLC resonant converter with synchronous rectification for high-end portable computer adapters. It validates system-level integration of L6563H (PFC), L6599A (LLC controller), and SRK2000A (SR driver), delivering >92% efficiency and sub-500 mW no-load consumption per ENERGY STAR® requirements.

Does the board include schematics, layout files, and BOM?

Yes - the official AN3014 application note (DocID16064 Rev 3) provides complete electrical schematics (Figure 2), transformer and PFC coil winding specifications, thermal maps (Figures 16–17), conducted emission test data, and a full bill of materials (Table 5), all intended for direct engineering reuse and design verification.

Can EVL90WADP-LLCSR be used for regulatory pre-compliance testing?

Yes - the board was tested for EN61000-3-2 Class D harmonics (Figures 4–5), EN55022 Class B conducted emissions (Figures 18–19), and thermal performance (Figures 16–17), with results documented in AN3014. It serves as a pre-compliance benchmark for final product certification when implemented with identical magnetics, layout, and component selection.

Is firmware or software configuration required to operate the board?

No - the EVL90WADP-LLCSR is an analog-controlled hardware reference design with no microcontroller or programmable firmware. All functions - including PFC startup sequencing, LLC frequency modulation, burst-mode light-load operation, and SR timing - are implemented via dedicated pins and external passive components as specified in the AN3014 schematic and design notes.