• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 660 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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:

ISO5852S: Desat level shift

ISO5852S: Desat level shift

vladimir vladimir1
Intellectual 565 points
Part Number: ISO5852S

Hello.

I finally assembled the stand on ISO5852. I conduct experiments to protect IGBT against short circuits. On the 1st chart - a soft short circuit, on the 2nd graph - a hard short circuit. Yellow - Uge (+15V on,-15V -off), green-collector current(0.2mV/A), and blue - voltage on the 2 legs of the chip (Desat pin). In the first case, the protection operates as expected - when the voltage reaches 9V, the transistor turns off. In the second experiment, it turns off when the voltage at pin + 25V. Why does not it turn of transistor at 9V ???

  • 0
    TI__Intellectual 1665 points

    Hi Vladimir,

    In order for us to better understand your system, could you please share the schematic of your testing circuits and brief description of the testing process? What are the signals of UCE, IC, and IC_rog? Thanks. 

    With Regards,

    Xiong

  • 0 in reply to Xiong Li
    TI__Guru**** 189399 points
    Hi Vladimir,

    Since we haven't heard back from you, we must assume you've solved your issue. If you want to post how you solved it to help other Community members, that would be great!

    If you haven't solved it, please provide the info Xiong requested, and we will work with you to solve it.