Problem regarding MOSFET (IRF540)

[Kashif_932]

Hope you people would be allright...


i have generated pwm through SG3525 IC and then i have given its output to IR2110 to make it 12 volt pwm by which i am driving MOSFET (IRF540) at 10 to 40% duty cycle. when i place CHOPPER at the source of this MOSFET then MOSFET gets too much heated..

(drain voltage for MOSFET is 12 to 17 voltage)

without palcing chopper it's working fine but with chpper it gets heated....


can anyone guide me why MOSFET(IRF540) is getting heat???



i would be highly thankul to you people....

 

[cl10greg]

The general rule of thumb for heating MOSFETs is either from linear region use, not enough current for switching, or actual conduction (on resistance).

1.) Can you show the circuit?
2.) What is your load that you are driving?
3.) What is the switching frequency?

The problem could lie within the speed you are switching at and the 500mA the chip is able to source. You need to find out how fast you need to switch the device to ensure that it is all the way on and off and then how much current that takes.

 

[--BawA--]

Which topology are you using a full bridge or pushpull ?