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Old 14th February 2009, 03:16 AM   #1
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Default Remote mounting fets

I have an amp that has a heavy board (car audio class D) and between that and vibration it causes fet legs to break with a cascading effect. There is no way to better secure the board but is there a way to remote mount the fets to the sink using a copper braid between the PCB and the legs to isolate vibration/movement ? Has anyone done this and if so could you paste up some pics? I know thinks like this exist especially if you look at alternator/electrical motor brushes it is done this way. Only thing I need to make sure is if the braid can handle the current. I was looking at copper desoldering braid. Any and all input welcome...
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Old 14th February 2009, 07:47 AM   #2
Bakmeel is offline Bakmeel  Netherlands
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In general, it is not adviseable to add lengths of wire to switching mosfets. Especially in high frequency the added wire inductance can cause you nasty problems such as ringing, added dissipation etc.

However, I have seen it before in DC/DC converter applications switching at 130kHz.

1. Keep the wires as short as possible. Generally no more than 3 - 4 cm.

2. Keep Gate, Drain and Source wires close to one another to minimise loop inductance. Do not twist the wires tightly however... This will only add inductance.

Good luck!
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