Gate Driver ICs Forum Discussions

[User16966]

Hello All,

I'm using IGCM20F60GA to drive a three phase motor.

It is working very well.

Now I'm trying to use the CIPOS as two leg full bridge.

In order to spin the dc motor in one direction I keep phase V high in full conduction.
and I modulate phase U low.

It is possible for the power module to work like this?

I suspect we can have some problem with bootstrap circuit.

Can anyone help me to understand why this configuration is not working?

[Srivatsa · Accepted solution]

Hi

We see no issue in using only two legs of the IGCM20F60GA. What is the switching frequency / duty cycle and the bootstrap capacitor value? Make sure there is sufficient time to charge the bootstrap capacitor or use lower values. Also look at any undervoltage conditions.
The under-voltage detection operates with a rising supply threshold of typical VBSUV+ = 12.1V and a falling threshold of VBSUV- = 10.4V.

Best regards,

Srivatsa