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SN754410 - Thermal shutdown

Hirotaka Matsumoto
Guru 27585 points
Other Parts Discussed in Thread: SN754410

Hi all

Would you mind if we ask SN754410?

<Question1>
How much is TJ temperature which the device start to protect(operate) the thermal shutdown function?
Over 150C or less that 150C?

<Question2>
During the thermal shutdown function operating, the output stops(low level). 
After that, will the output return automatically? or latch-off?
(So, is the output in case of after the thermal shutdown function Auto-retry or Latch-off?)

We could not find it on the datasheet.
We need your help.

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 26065 points
    Hi Hirotaka

    We need to check the develop group of this device and get back later.

    Best regards,
  • 0 in reply to Wilson Zuo
    TI__Mastermind 26065 points
    The answer of your first question should be less than 150C. The MAX junction temperature should be 150C.
    In datasheet 9.4, it says the thermal shut down will put the outputs into HIGH-Z state. So it is not LOW or HIGH the output transisters are all in OFF state.

    Best regards,
  • 0 in reply to Wilson Zuo
    Guru 27585 points

    Wilson san,

    Thank you for your prompt reply.

    We got that thermal shut down Tj should be less than 150C.
    So how much is the exact value? Less than 150C but over 145C?

    And then, after the thermal shutdown mode released, it is not Latch-off, is it?(auto retry?)

    Kind regards,

    Hirotaka Matsumoto

  • 0
    TI__Guru**** 165176 points
    Hirotaka san,

    I did not find any test data for temperature shutdown. However, I know the standard target design is for 170C. The actual value may be a little different. The temperature shutdown protects the device from immediate damage during output shorts.

    The output becomes high Z when overheated. When in high-Z state the device will begin cooling and the device will automatically turn back on.
    If the overload is still present, then the device will alternate between on and off as needed to maintain a constant temperature.
  • 0 in reply to Ron Michallick
    Guru 27585 points

    Ron san,

    Thank you for your prompt reply and your cooperation always!

    OK, we got it.

    Kind regards,

    Hirotaka Matsumoto