UCC21530: UCC21530EVM-286 Performance problem

yingjiao LI

Part Number: UCC21530
Other Parts Discussed in Thread: ALLIGATOR

We used four boards of this model. After the computer test, one of the boards was abnormal and did not respond, and there was no output after the PWM input was given. Could you please help confirm the reason

thank you

over 1 year ago

0 Hiroki Honda over 1 year ago

TI__Expert 8686 points

Hi Yingjiao,

Thank for your interest in our products and reaching out on E2E!

Some immediate thoughts that come to mind:

Are the jumpers in the same configuration?
Are the probes/alligator clamps making contact with other pins?
What is the order in which the board is powered up?
- Ideally want to power up the supplies first before giving any inputs to avoid exceeding datasheet specifications
- Measure resistance between output side pins (VDDx-VSSx, VDDx-OUTx, OUTx-VSSx)
  - Check for shorts

Regards,
Hiroki

0 yingjiao LI over 1 year ago in reply to Hiroki Honda

Expert 1375 points

Is the output port of the op amp equipped with TVS

0 Hiroki Honda over 1 year ago in reply to yingjiao LI

TI__Expert 8686 points

Hi Yingjiao,

Do you mean the gate driver output?

The gate driver output diodes can be modeled as such:

Exceeding the datasheet specs can cause damage to these diodes.

Regards,

Hiroki

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UCC21530: UCC21530EVM-286 Performance problem