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TPS92611-Q1: about the Low-Dropout Mode

qinlei
Intellectual 430 points
Part Number: TPS92611-Q1

Tool/software:

hello

About the IC  Low-Dropout Mode, i have some question.

two case:

① the VDIAGEN= H, The diagnosis is valid. 

 When I gradually reduce the input voltage, I think eventually the open circuit protection will be triggered, The fault pin will be pulled low， Will the LED be turned off when the open circuit is triggered?

②the VDIAGEN= L, The diagnosis is not valid. 

When I gradually reduce the input voltage, I think eventually the open circuit protection will be triggered,Will the fault pin still be pulled low? Will the LED be turned off when the open circuit is triggered? 

Can one fail all fail  be achieved by connecting FAUlt pins together in this case?

③and i have another quesiton, if i use PWM control, I think the open circuit detection will be detected under the condition of PWM high level. How long can the detection time be judged as a fault?

thank you

best regards 

  • 0
    TI__Genius 10120 points

    Hi Lei,

    The DIAGEN is used to enable or disable the open-load diagnostic function, it will affect the open-load detection.

    ①When the DIAGNEN is high, the LED won't be turned off, but FAULT pin will be pulled down.

    ②When the DIAGEN is low, the LED won't be turned off, but the FAULT pin won't be pulled down.

    In the case ①, if multiple devices are connected via a same FAULT bus, the output channel of other devices will be turned off since the FAULT pin is pulled low;

    In the case ②, since no open-load fault is detected, other device won't be affected.

    Please see the blew detection time for open-circuit.

    BR,

    Hailee.