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TPS92629-Q1: Ground fault mode

Taku Murayama
Intellectual 1830 points
Part Number: TPS92629-Q1

Tool/software:

Hi,

I would like to ask about the operation of the TPS92629QDGNRQ1 during ground fault mode.
During the ground fault mode, the current is limited to I (Retry). If the EN pin is controlled from on to off to on, will the set current flow again?
If there is a description in the data sheet, please let us know the person where it is written.

BR,

Taku

  • 0
    TI__Expert 4405 points

    Hello, Team,

    We think what will happen is something like below:

    After toggling the EN while on short-to-GND condition, the IC will first try to run the set current value and then limits it to Iretry (what we want to confirm is whether they will first try to run the set value or will limit the current from the beginning.)

    Best,
    Masaru

  • 0 in reply to Masaru Oinaga
    TI__Genius 10120 points

    Hi Masaru,

    No, it's supposed to be always low when it is in the fault status. you can easily do the test based on the EVM board. Thanks!

  • 0 in reply to Hailee Xu
    TI__Expert 4405 points

    Hi, 

    So, the fault would not be cleared after toggling EN? Is it because when EN turns on, it will first check whether the output is in short condition?

    Here's the modification I made from the previous image; let us know if its correct understanding (does current even go up to Iretry?):

    Masaru

  • 0 in reply to Masaru Oinaga
    TI__Genius 10120 points

    Hi Masaru,

    Sorry for the misunderstanding caused. The EN/PWM could work as Enable function or PWM function.

    If it works as Enable function, when you re-toggle the EN, the device will release the FLT pin, and re-detect the fault, the FLT will be pulled to the fault voltage level. for the output current, when FLT is released, the current will be the set value, then limits to the low value-Iretry.

    but if you are running in the PWM mode via EN/PWM pin, the FLT will be always in the fault voltage and the output current will be low until the fault is removed. Thanks!