UCC21530-Q1: why gate driver output pulses and the input pulses are different?

suresh rajaram

Part Number: UCC21530-Q1

As you can see that there are two waveform in the oscilloscope. Top one is the output of the gate driver first channel output OUTA (yellow in color) and the below one is the driver input given from the STM microcontroller ( blue in color). why the yellow one has less number of pulses than the blue one?

9 months ago

0 Hiroki Honda 9 months ago

TI__Expert 3351 points

Hi Suresh,

Thank you for your interest in this part!

Would you be able to provide some details of the schematic and waveform captures of VDDA and OUTB if channel B is also being driven?

This will be greatly helpful in finding the source of the issue.

Regards,

Hiroki

0 suresh rajaram 9 months ago in reply to Hiroki Honda

Prodigy 50 points

VDDA is 15v and VSSA is -8.7v. I haven't taken the output of OUTB. I shall measure and post it later. Interestingly the pspice simulation works fine. But only the problem is in the real hardware.

0 suresh rajaram 9 months ago in reply to suresh rajaram

Prodigy 50 points

Sorry to mention that the channel B is not being driven.

0 suresh rajaram 9 months ago in reply to suresh rajaram

Prodigy 50 points

Is there any private channel where i can explain my schematic. I cannot post it in public.

+1 Hiroki Honda 9 months ago in reply to suresh rajaram

TI__Expert 3351 points

Hey Suresh,

I reached out to you privately to help through email. Closing the thread here.

Thanks!

Hiroki

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UCC21530-Q1: why gate driver output pulses and the input pulses are different?