• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 166 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.

Original question:

UCC21750-Q1: Driver Safety with respect to DESAT pin

UCC21750: does the DESAT feature need the non 100% duty operation to trigger?

Hank Lin
Intellectual 1685 points
Part Number: UCC21750


Tool/software:

Dear team,

May I know, according to user guide 2.2.3 Overcurrent and Short Circuit Soft Turn OFF Test

Why do we find that if Duty adjust to fully turn on (99.99%) to EVM, desaturation function couldn’t be triggered?

is this related to the description?

Best regards,

Hank Lin

  • +1
    TI__Expert 6730 points

    Hi Hank, 

    If the duty cycle is very low and the output does not stay high for long enough, the leading edge blanking time and deglitch time will come into play and basically prevent DESAT from triggering. Duty cycle being very high should not affect DESAT triggering. 

    Could you help provide the following waveforms in your setup to help us understand it better? 

    • Input signal 
    • Vgs/output signal
    • DESAT
    • nFLT

    Thanks, 

    Vivian