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e-Fuse / Latch-off by overvoltage

ACGUY
Guru 11170 points
Other Parts Discussed in Thread: TPS24750, TPS24720

Hi,

Does TI have e-Fuse that will be latch-off by overvoltage?

Regards,

ACGUY

  • 0
    TI__Guru** 107361 points
    Hi Acguy,

    Thanks for reaching out!.
    We have parts which cuts-off output for overvoltage event and resumes operation when overvoltage event is cleared. We don't have part which gets latch-off by overvoltage. Can you let me know the application use case. why you don't want the eFuse resume operation when input overvoltage event is cleared?

    Thanks
    Rakesh
  • 0 in reply to Rakesh
    TI__Guru 71526 points

    What about using the TPS24750: www.ti.com/product/TPS24750 as a possibility (or the TPS24720 with EXT FET)?

    ~Leonard 


  • 0 in reply to LeonardEllis
    TI__Guru** 107361 points
    Hi Leonard ,

    These devices also resumes operation when overvoltage event is cleared and does not latch-off by overvoltage event.

    Regards,
    Rakesh
  • 0 in reply to Rakesh
    Prodigy 5 points

    Power Tip 38, by Robert Kollman, shows how to use an SCR transistor configuration to latch off an OFFLINE power supply for output over voltage. The concept of using an NPN PNP latch can be applied to many circuits.

    Power Tip 38 can be found on YOUTUBE and on TI.COM. Search and it can be found. 

    Power Tip 38: Simple Latch Circuit Protects Power Supplies

    The Q4Q5 circuit is triggered by the zener conduction D5 D6 which turns on the opto, which engages the latch, which pulls down VCC on the PWM controller.

    The latch will stay engaged until full power is removed and the latch current get close to zero.

  • 0 in reply to Ed Walker
    Guru 11170 points
    Hello everyone,

    Thank you for many advices.
    I will try external circuit for latch-off by overvoltage.

    Many thanks,
    ACGUY