ST’s MasterGaN Reference Design Demonstrates Heatsink-Free 250W Resonant Converter


STMicroelectronics has released the first reference design for its MasterGaN power packages, illustrating how the new highly integrated devices rise power density, boost energy efficiency, simplify design, and speed up a time to market.

The EVLMG1-250WLLC reference design is a 250W deep converter with a 100mm x 60mm board outline and 35mm maximum component height which features the MasterGaN1, containing one half-bridge STDRIVE gate driver ideally 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 heatsink-free, leveraging the high efficiency of the GaN power transistors. In addition, GaN’s superior switching performance allows a higher operating frequency than usual silicon MOSFETs, permitting smaller magnetic components and capacitors for greater power density and lessen the bill of materials.

Designed for a nominal 400V supply, the EVLMG1-250WLLC offers a 24V/10A output and attains maximum efficiency above 94%. Benefiting from MasterGaN’s integrated safety features, the converter output is protected against short circuits and overcurrent. There is also brown-out protection and an input-voltage monitor that allow 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.

For more information please go to STMicroelectronics