Okay, so I'm starting to work again on this project after a long hiatus. It's a class D full bridge amp intended to be used for subwoofers so it doesn't need to be exactly hifi, and it uses HIP4081 and discretes. Anyways, I still have a couple of questions about design:
1. How should grounding be done? Currently I have separate ground for the high-current signal, and for driver chip and PWM modulator.
2. Should I use some fast recovery diodes parallel to the body diodes in FETs?
Here's the schematic and layout:
http://koti.mbnet.fi/~jokunen_/classD_schematic.png
http://koti.mbnet.fi/~jokunen_/classD_layout.png
1. How should grounding be done? Currently I have separate ground for the high-current signal, and for driver chip and PWM modulator.
2. Should I use some fast recovery diodes parallel to the body diodes in FETs?
Here's the schematic and layout:
http://koti.mbnet.fi/~jokunen_/classD_schematic.png
http://koti.mbnet.fi/~jokunen_/classD_layout.png
Looking at your PCB layout, the ground forms a loop. diagonally make a cut at the 60degree point on the board. That will ensure one return point for your ground and not two routes.
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