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TPS1H200A-Q1: Open Load Detection

Koji Hayashi92
Mastermind 6970 points
Part Number: TPS1H200A-Q1

Hi TI-team

My customer wants to know about "Open Load Detection"

Is this feature only detection, not protection ?

Does the Fault signal just go low ?

Does the OUT behavior change at the time of detection ?

 

Best Regards,

Koji Hayashi

  • 0
    TI__Expert 3575 points

    Hi Koji Hayashi, 

    Is this feature only detection, not protection?

    This feature asserts the Fault signal low and lets the user know that the load is off. The device will not turn off when Open Load is detected. Since there is no current going through the device, the channel is left ON in order to recover the device when the fault is removed. This feature could alert the system when there is a fault. That being said, you are correct, this feature lets the user know of an open load. 

    Does the Fault signal just go low? 

    The Fault signal asserts low when an open load is detected 

    Does the OUT behavior change at the time of detection?

    The switch will remain enabled when the open load is detected. 

    If this answers your query, Please click "This resolved my issue" button.

    Sincerely 

    Francisco Lauzurique 

  • 0 in reply to Francisco Lauzurique
    TI__Expert 3575 points

    Apologies, for some reason the image was not included. 

  • 0 in reply to Francisco Lauzurique
    Mastermind 6970 points

    Hi Francisco-san

    Thank you for response.

    >The switch will remain enabled when the open load is detected. 

    Are you saying that the behavior of the output depends on the load at the time ?

    My customer use Auto-Retry mode.

    At first, Auto-Retry was repeated with the output open (however, the capacitor has about 10uF).

    Next, they changed the current limit to 6A, and the desired output came out (no Auto-Retry operation).

    After that, they changed the current limit back to 600mA, and the desired output came out, but without Auto-Retry operation.

    Why does it Auto-Retry at the first 600mA but not when they change it to 6A and then to 600mA ?

     

    Best Regards,

    Koji Hayashi

  • 0 in reply to Koji Hayashi92
    TI__Expert 3575 points

    Hi Koji Hayashi, 

    Would you be able to provide me with the portion of the schematic for the High side switch?

    In addition, do you have waveforms measurements of the issue above that you could provide me with in order to begin the debugging for this issue?   

    Sincerely, 

    Francisco Lauzurique

  • 0 in reply to Francisco Lauzurique
    Mastermind 6970 points

    Hi Francisco-san

    Thank you for response.

    I've asked my customer for a schematic and waveform.

    Please wait for a while.

    Also, since I can't upload to the forum (due to customer information), please register as a friend or let me communicate directly.

     

    Best Regards,

    Koji Hayashi

  • 0 in reply to Koji Hayashi92
    TI__Expert 3575 points

    Hi Koji Hayashi, 

    This can be taken offline. Can you share your email with me in order to begin offline communication? Thank you very much. 

    Sincerely, 

    Francisco Lauzurique