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TT_Man - 22 May 2008 16:40 GMT

Any one know why ESc's ( high current) are built with multiple MOSFETS and
not just a couple of 50A jobs? Seems technically entirely feasible....

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The Natural Philosopher - 22 May 2008 22:44 GMT

> Any one know why ESc's ( high current) are built with multiple MOSFETS and
> not just a couple of 50A jobs? Seems technically entirely feasible....

Generally cost/performance is better with a lot of smaller ones.

You ned 6 anyway to do the three phases..sometmes its easier if the bulk
of your sales are 25A ones and 25A ones ae cheap and low resitance,to
bang in 12 of what you buy in bulk, rather than order 6 specials.

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TT_Man - 23 May 2008 00:06 GMT

>> Any one know why ESc's ( high current) are built with multiple MOSFETS
>> and not just a couple of 50A jobs? Seems technically entirely
[quoted text clipped - 4 lines]
> of your sales are 25A ones and 25A ones ae cheap and low resitance,to bang
> in 12 of what you buy in bulk, rather than order 6 specials.

Just had a thought...maybe they have a single PCB, with options to add more
mosfets to increase the current rating... That would make good commercial
sense.
Thanks.

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Bill Kolofa - 23 May 2008 15:53 GMT

It takes 2 to 3 times as many P-Channel fets as it does N-channel fets to
achieve the same RDSon. So, many speed controls use 12 fets in total. (9)
P-channel and (3) N-channel.

> Any one know why ESc's ( high current) are built with multiple MOSFETS and
> not just a couple of 50A jobs? Seems technically entirely feasible....

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Model Forum / Radio Controlled / Air Models / May 2008

ESC's