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MD30C with 25 kHz PWM signal

PostPosted: Mon Mar 29, 2021 7:31 am
by Koskinkirva
I have a idea of using car radiator fan to cool my PC. For this I plan to use MD30C motor driver which should be compatible with car rad fans which are all basically 12V DC brushed motors. The problem is that MD30C supports PWM frequencies up to 20 kHz (by the specs), while PC motherboard and dedicated PC fan controllers all output PWM signal at 25 kHz.

Is it possible to use MD30C with 25 kHz PWM signal? If not, what is a limiting factor here? Maybe it is possible to make a modification to MD30C so it can support 25 kHz PWM?

Re: MD30C with 25 kHz PWM signal

PostPosted: Tue Mar 30, 2021 11:11 am
by waiweng83
The MD30C can be driven from 25kHz PWM signal, however, the current handling capability will be reduced due to the switching loss of the MOSFET.
You can try it out and as long as the motor current consumption is well below 30A continuously, it should be fine.