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UA78M: OTP and internal thermal- overload protection

David Woo
Prodigy 530 points
Part Number: UA78M

We have below some questions on the internal thermal-overload protection of UA78M33IKVURG3. Please help.

1. Is there OTP function on UA78M33IKVURG3? 

2. If there were OTP function or similar,  what value is the value when over-temperature triggered?

3. What is the exact function mechanism of the “internal thermal-overload protection” as stated in the data sheet? How does the IC work when overload or over temperature happen?

Could the operation be explained how the current or load can be limited when temperature was too high? What is the exact relation or values?

  • 0
    TI__Mastermind 29260 points

    Hi David,

    I am reviewing your question and will reply back within 2 business days.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 29260 points

    Hi David,

    This component is very old (1970's) and simulation models did not exist when it was designed.
    So the data we have for it is not as comprehensive as the data we have for our newer components.

    I reviewed some of the archives and there was a hand analysis completed in the past.
    The calculated trip point for the thermal shutdown is around 200C, but I do not have a tolerance to provide.
    The thermal shutdown is merely present to prevent a gross failure of the die.
    It is not meant to be a condition where the hardware will operate near, for any long term conditions.

    The OTP will shut down the IC when it trips.

    Thanks,

    - Stephen