New half-bridge evaluation board simplifies GaN transistor circuit design

06-11-2015 | GaN Systems | Design & Manufacture

GaN Systems has announced a new half-bridge evaluation board which
demonstrates the performance of its GaN enhancement mode power
semiconductors in real power circuits. The fully-functional GS66508T-EVBHB
Eval Board is easily configured into any half bridge-based topology,
including Boost and Buck modes.

The board comes with a Quick Start instruction guide and YouTube video
links to have the installation up and running in minutes. The Eval Board
can be used in synchronous Boost or Buck conversion, as well as pulsed
switching to evaluate transistor waveforms. The kit has full
documentation, including Bill-of-Materials component part numbers, PCB
layout and thermal management, and gate drive circuit reference design
which is also useful for system engineers to use in their products.

Designed to provide electrical engineers with a complete working power
stage, the evaluation board consists of two 650V, 30A GS66508T GaN FETs,
half bridge gate drivers, a gate drive power supply, and heatsink. The
GS66508T high power transistors are based on GaN Systems’ proprietary
Island Technology® and belong to its 650V family of high density devices
which achieve extremely efficient power conversion with fast switching
speeds of >100V/nS and ultra-low thermal losses.

GaN Systems is the only company to have developed and productised a
comprehensive portfolio of GaN power transistors with voltage ratings of
100V and 650V and current ratings from 7A to 250A. GaN Systems’ Island
Technology die design, combined with the extremely low inductance and
thermal efficiency of GaNPX packaging, provides its GaN FETs with 45x
improvement in switching and conduction performance over traditional
silicon MOSFETs and IGBTs.

The 30A/55m? GS66508T GaN power transistors are top-side cooled and
feature near-chip-scale, thermally-efficient GaNPX packaging. 98.7% power
conversion efficiency at 1.5kW is shown in the product documentation and
can be reproduced in the owner’s lab, says the company.

The Eval Board provides footprints for output power inductors and
capacitors to allow users to configure the board into desired Boost or Buck
operational modes. Access to the transistor junction temperature is
provided by both thermocouple pads and thermal camera imaging ports. Power
input should be 9VDC to 12VDC, with an absolute maximum of 15V. On-board
voltage regulators create +5V for the logic circuit and +6.5V for the gate
driver. There are three operational modes: pulse test mode; buck/standard
half bridge mode and boost mode.

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