GaN Talk a blog dedicated to crushing silicon
Term: Hyperscale
2 post(s) found

How to Design an eGaN FET-Based Power Stage with an Optimal Layout

How to Design an eGaN FET-Based Power Stage with an Optimal Layout
Oct 24 2018

Motivation

eGaN FETs are capable of switching much faster than Si MOSFETs, requiring more careful consideration of PCB layout design to minimize parasitic inductances. Parasitic inductances cause higher overshoot voltages and slower switching transitions. This application note reviews the key steps to design an optimal power stage layout with eGaN FETs, to avoid these unwanted effects and maximize the converter performance.

Impact of parasitic inductance on switching behavior

As shown in figure 1, three parasitic inductances can limit switching performance 1) power loop inductance (Lloop), 2) gate loop inductance (Lg), and 3) common-source inductance (Ls). The chip-scale package of eGaN FETs eliminates any significant inductance within the transistor itself, leaving the printed circuit board (PCB) as the main contributor. Each parasitic inductance is a consequence of the total area encompassed by the dynamic current path and its return loop. (See WP009: Impact of Parasitics on Performance).

48V-to-1V Conversion – the Rebirth of Direct-to-Chip Power

48V-to-1V Conversion – the Rebirth of Direct-to-Chip Power
Jul 28 2017

This post was originally published May 26, 2017 on the PowerPulse.net web site . Learn more about eGaN technology and EPC GaN solutions for 48 V to Point-of-Load.

During last week’s PCIM Europe event in Nuremberg, Germany, direct 48V-to-1V power conversion architectures were a significant topic, mostly outside of the exhibit floor. Vicor was quietly showing its latest generation of 48V direct-to-chip power components. Ericsson Power Modules and Efficient Power Conversion were holding invitation-only meetings where future designs of 48V direct to load power conversion architectures were the focus of the discussions. By the end of 2017, several vendors are expected to be offering dc-dc converters delivering 48V-to-1V direct conversion.