I have 3 mosfets:
a) 1 for line powered flyback convertor switching, Peak Drain Voltage is 500V b) 1 for high side of 12V DC motor control (for free wheeling) c) 1 for low side of 12V DC motor control
The circuit is such that when the power supply is on, battery charges and the motor is disabled and when the power supply is off, the motor may be running on battery.
So at any instant, either (a) is on or (b) and (c) are on.
- I would like to mount all 3 mosfets on a single heat sink, using mica insulators.. Is this ok?
- Somehow if I could mount all 3 on the metal case, it would be great, but there is an issue of safety .. Any advise on how to do this safely?
- This box is going to be used in a vehicle, so I plan to air-seal it for protection against moisture, water and dust [that's why avoiding separate heat sinks while using case as heat sink is better]. I assume that the heat dissipation out of the box will be a problem. Any ideas for this?