• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 63 subscribers
  • Views 113 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC21530: UCC21530 -40 Working ıssue.

sadik TAHTA
Prodigy 20 points
Part Number: UCC21530

Tool/software:

Hello;

We are using UCC21530 IC for isolated half bridge gate deriver. I had test on our hardware in -40 celsius and gate deriver IC OUTA  stay low while INA and INB have input PWM signal also OUTB have PWM signal but OUTA stay low in -40 degree.  How to fix this problem.

  • 0
    TI__Expert 8686 points

    Hi Sadik,

    Thanks for reaching out with this.

    A couple questions to better understand on my end:

    • Have you tried an ABA swap test? Does this issue follow a specific device?
    • Could you try measuring the pin-to-pin impedances on the device to see if there could be damage?
      • VDDA - VSSA
      • OUTA - VSSA
      • VDDA - OUTA

    Looking forward to hearing back.

    Regards,

    Hiroki

  • 0 in reply to Hiroki Honda
    Prodigy 20 points

    Hi Hirkoki;

    We had tried ABA swap test and fail IC still not working on the good hardware. We measure pin to pin impedance.

    Working IC  Fail IC
    VSSA-VDDA 362K 350K
    VA-VDDA 370K 356K
    VSSA-VA 388K 388K
    INA-GND 183K 190K
    INB-GND 190K 190K

    IC ıssued date 21 oct 2020.

  • 0 in reply to sadik TAHTA
    TI__Expert 8686 points

    Hi Sadik,

    Thank you for sharing these helpful details.

    That helps clarify that there is no obvious damage on OUTA.

    Would you be able to provide any waveforms of this issue?

    I am wondering if this is related to bootstrap circuit or noise on VDDA.

    Regards,

    Hiroki

  • 0 in reply to Hiroki Honda
    Prodigy 20 points

    Hi;

    Finally We found the problem that is about low voltage supply;

    pin 3 and pin 5 supply directly connect to the +15V but pin 8 supply connect to the after FB15 ferrite that broke the IC.