MOSFET High frequency Switching IR2110 / IR2118

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sac1991

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I am using this driver circuit to test IR2110/ IR2118 ICs

https://4.bp.blogspot.com/-Dk7PjN576ek/UPvn4v8I1NI/AAAAAAAAAaI/pyhB2pXQcEw/s1600/IR2110+-+4.png

At low frequency everything is working fine. But when I am switching at high frequency(100kHz) IC is getting damaged. With increase in frequency, during turn on ringing is appearing in the voltage waveform ( I have connected a single resistor and mosfet to test the ICs).

My guess is IC damage is happening due to stray inductance of the breadboard and wire connectors. So it may work fine in the PCB.I want to know is anyone have worked on these kind of driver IC at 100kHz or above. Any suggestion and new ideas will be helpful.
 

Hi,

another IR2110 related thread....

The circuit is the standard circuit, as given in the datasheet.

With increase in frequency, during turn on ringing is appearing in the voltage waveform
Click to expand...
ringing .. in which node?

My guess is IC damage is happening due to stray inductance of the breadboard and wire connectors.
Click to expand...
I´d say a breadboard isn´t useful with a power switching circuit...

As you already wrote.. it is likely that the circuit works without problems at a good designed PCB.

***
But on the other side I wonder how the IC can become damged.
I recommend to install overvoltage protection across DS of the FET. See if this improves the situation.

Load: you say resistor. Maybe a "wire wound" power resistor? Wire wound reistors are not suitable for higher frequencies, because of ther large series inductance.
This inductance may cause voltage spikes when switched OFF.

Klaus
 
Thanks a Lot. I was using a wire wound power resistor. I didn't thought about its inductance.
 

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