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Author Topic: pwm 5 amps  (Read 2121 times)

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Tobias

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pwm 5 amps
« on: May 29, 2010, 20:38:51 PM »
What is the best way to hook up a pwm coil 5amps to a microcontroller where could I find a good circuit? I am using a irf530 mosfet hooked directly to the pin of my microcontroller picaxe and it gets very hot, know that that is not the correct way of doing it...

Thanks Toby

kam

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Re: pwm 5 amps
« Reply #1 on: May 29, 2010, 21:52:19 PM »
Maybe you need a mosfet driver. Do you haev a pull-up resistor? I suppose so. This need to be small, smaller than 1K. And also, the frequency (if you use a resistor) must not be very high, otherwise the overheat is normal. Check for mosfet drivers in maxi, harris etc. IRF530 is enough for 5 amps. You need also a heatsink.