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

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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 st.com and distributors, for $230.00.

For more information please go to STMicroelectronics