6 Pairs of VMOS output stage for the modular high end audio amplifier

Project presentation

Abstract

The amplifier output stage presented here is part of my modular audio amplifier system. It is designed to be equipped with six pairs of vertical MOSFETs in TO-247 housing, for example IRFP240 and IRFP9240. Of course, different pin compatible transistors can be used as well.

Design presentation

Design considerations

This output stage is basically like the four pairs vertical MOSFET output stage, just with two extra pairs of transistors for higher safe operating area.

Schematic

Assembly

Summary

For even higher required output power, this is the output stage to use. The overall module size is only 20mm larger than the four vertical MOSFET pairs stage, but it features six pairs instead. This means that the module is both high power and compact.