Hi Guys,
I have a design that uses 4 x p-channel mosfets in parallel to share a load up to 80 amps. They are driven by a single source with a frequency of no more than 500 hz. But even at 65 Hz, the design generates a great deal of heat.
I have been using a similar design using n-channel mosfets, that has worked fine. The heat peaks well below acceptable threshold even at 100 amps. I'm using the same basic circuit board design with the only change being the p-channel fets and of course the drive circuitry.
With the n-channel, I used mosfet driver chips, one for each pair of mosfets. Each pair of fets is on opposite sides of the pcb. They attach to the sides of the case which is a big aluminum heat sink.
I suspect my drive circuitry is at fault, or perhaps my selection of mosfet chip, which was selected based on lowest on resistance in its class. I'm no EE so was hoping someone could help me figure out how to reduce the heat on this design.
Does anyone have an idea on what I need to improve to reduce the heat generated?
Thanks.
I have a design that uses 4 x p-channel mosfets in parallel to share a load up to 80 amps. They are driven by a single source with a frequency of no more than 500 hz. But even at 65 Hz, the design generates a great deal of heat.
I have been using a similar design using n-channel mosfets, that has worked fine. The heat peaks well below acceptable threshold even at 100 amps. I'm using the same basic circuit board design with the only change being the p-channel fets and of course the drive circuitry.
With the n-channel, I used mosfet driver chips, one for each pair of mosfets. Each pair of fets is on opposite sides of the pcb. They attach to the sides of the case which is a big aluminum heat sink.
I suspect my drive circuitry is at fault, or perhaps my selection of mosfet chip, which was selected based on lowest on resistance in its class. I'm no EE so was hoping someone could help me figure out how to reduce the heat on this design.
Does anyone have an idea on what I need to improve to reduce the heat generated?
Thanks.