GaN design for heatsink-free 250W resonant converter

May 13, 2021 // By Nick Flaherty
GaN design for heatsink-free 250W resonant converter
​STMicroelectronics has released the first reference design for its MasterGaN1 power packages, enabling a 250W resonant converter with no heatsink

The EVLMG1-250WLLC reference design is a 250W resonant converter with a 100mm x 60mm board outline and 35mm maximum component height. This is based around the MasterGaN1 system-in-package, which contains one half-bridge STDRIVE gate driver connected to two 650V normally-off GaN transistors with matched timing parameters, 150mΩ on-resistance (Rds(on)), and 10A maximum current rating. The logic inputs are compatible with signals from 3.3V to 15V.

MasterGaN1 is suitable for high-efficiency soft-switching topologies including resonant converters, active clamp flyback or forward converters and bridgeless totem-pole PFC (power-factor correction) in AC-DC power supplies, DC-DC converters, and DC-AC inverters up to 400W.

The primary side runs without needing a heatsink a result of the efficiency of the GaN power transistors. GaN’s switching performance allows a higher operating frequency than ordinary silicon MOSFETs, permitting smaller magnetic components and capacitors for greater power density and reduced bill of materials.

Designed for a nominal 400V supply, the EVLMG1-250WLLC provides a 24V/10A output and achieves maximum efficiency above 94 percent. The integrated safety features mean the converter output is protected against short circuit and overcurrent. There is also brown-out protection and an input-voltage monitor that permits sequencing within an array of DC-DC converters and prevents a motor from starting under low-voltage conditions.

ST’s MasterGaN family comprises pin-compatible integrated half-bridge products including symmetrical and asymmetrical configurations, housed in a 9mm x 9mm low-profile GQFN package.  Containing circuitry rated up to 650V, the packages have over 2mm creepage distance between high-voltage and low-voltage pads. MasterGaN modules are available in various power ratings, allowing engineers to scale their designs with minimal hardware changes.

The EVLMG1-250WLLC is available now from and distributors for $230.00.

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