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UC2825: Idea for disable setting

Satoshi
Guru 19645 points
Part Number: UC2825

I need to add disable circuit for UC2825(Push-pull) due to measure abnormal prevention. 

I think that UC2825's CT pin left short by external circuit, UC2825 will be disable. (oscillation will stop)

Is this idea no problem?

If there the other good idea, please let me know. 

Best regards,

Satoshi

  • 0
    TI__Genius 13660 points
    Hi Satoshi,

    I have asked one of my colleagues to answer this question, but please understand that response may be delayed due to holidays. Thank you.

    Regards,
    Teng
  • 0 in reply to Teng Feng
    TI__Expert 3095 points
    Hi Satoshi,
    Normal methods for shutting down the UC2825 are either:
    a) Pull the ILIM/SD pin up above 1.4V.
    b) Pull the Soft Start pin down below 1.1V. This can easily be done using an external transistor or gate fed through a series diode.
    I recommend using the second option since once the fault is cleared this will allow the part to start normally.
    Thanks
    Joe Leisten