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Remote mounting fets
Remote mounting fets
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Old 14th February 2009, 04:16 AM   #1
Safe_Cracker is offline Safe_Cracker  United States
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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, 08:47 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!
More Power Igor! More Power!
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