Mosfet Driver getting heated up

Thread Starter

Siddhi Mehta

Joined Nov 27, 2015
1
I am trying to make a 3phase mosfet driver for motor.But i only need the low input signals from mosfet driver as high input signals are provided by separate controller.

I am using

HCPL-250L Optocoupler : which will take Vcc of 5V and input signal of 12V which is connect in series with a resistor of 570Ohms.

Mosfet IRFP4468PbF (https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjiheragJDLAhXFWxoKHYa7D7cQFggqMAA&url=http://www.irf.com/product-info/datasheets/data/irfp4468pbf.pdf&usg=AFQjCNFs3x7ABpje21K0wBXZpuEfzIfAoQ&bvm=bv.115277099,d.d2s) : which has a resistor connected of 0.18ohms and has input of 12V

Mosfet Driver HIP4086 (https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjY_P-UgZDLAhULmBoKHWBUDkgQFggcMAA&url=https://www.intersil.com/products/HIP4086&usg=AFQjCNFP90-9NFC3UZzyHGDOY1u96g80OA&bvm=bv.115277099,d.d2s) : Which has RDEL of 10Kohms. no bootstrap connect. Vdd of 12V.

The problem: While doing ym first test, I got output from driver of 12V which was perfect. But after a while, doing my second test the mosfet driver gave output of 2.5V and started to heat up. So now i am confuse what went wrong?

  • Shoudl i include a bootstrap to have floating voltage?
  • change the resistor value which is connected to mosfet?
  • Change RDEL value?
I am not very good in electronic so any kind of help would be good.

Thank you,

Kind Regards,
 
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