Spikes in the output of IR2110

[SandeshKanchodu]

I was trying to implement an inverter with an h-bridge configuration using IR2110(the standard configuration of this). But I got spikes during the transition. Switching frequency was 50kHz. Please help!! Thanks in advance.

 

[KlausST]

Hi,

IR2110 issues are one of the most discussed topics here. Go through existing threads.

Show your complete schematic (source of driving signal, IR2110, H-bridge, load)
Show a scope picture of the "spikes" and show exactly where you connected the scope.
Show a photo of your circuit including wiring.

Klaus

 

[Easy peasy]

buffering the o/p helps a lot, you need minimum inductance in the wiring on the fets too ...

 

[SandeshKanchodu]

Thanks for the reply..... I could remove the spikes by increasing the gate resistance...... Can someone help me as to why the spike was removed and what is the optimal value of gate resistance and how to calculate it.....

 

[Easy peasy]

try 47 ohm on, and reverse diode (schottky) for off ...

 

[KlausST]

Hi,

Without tho requested informations (post#2) we can only guess:
I assume it's caused by stray inductance ... caused by bad PCB layout or wiring.
(But if you read through other H-bridge driver problems ... you will know that already ;-) )

Klaus