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Original question:

TPS1211-Q1: TPS12110-Q1 OV not uesd

TPS1211-Q1: TPS12110AQDGXRQ1

?? ?
Prodigy 40 points
Part Number: TPS1211-Q1

Tool/software:

Hello, experts from TI,
I found that there is a problem with the OV hysteresis function when using TPS12110. The OV threshold I set is 33.4V,
But when the VIN is at 33.4V, 12110 will close and then automatically reopen. It seems that the OV detection delay did not work, which will cause my external MOS DS to burn out.

  • 0
    Prodigy 40 points

    Is there any way to set the closing voltage to 34V and the reopening voltage to 18V?
    Or can the OV function be disabled?

  • 0 in reply to ?? ?
    TI__Expert 8610 points

    Hello, 

    I see with the values you have chosen I am calculating close to 1.178V at OV pin, this is just below/ very close to the OV threshold. If you can adjust your resistors to an OV value > 1.18 like 1.2V or even 2V, you can see if this will help you. 

    If you do not want to use OV you can connect it to GND. 

    Thank you, 

    Sarah

  • 0 in reply to Sarah Raines
    Prodigy 40 points

    What I am concerned about is that when the voltage on the OV pin is greater than 1.178V, the external MOS will be turned off. When the voltage on the OV pin is lower than what, the MOS will be turned back on? Can the hysteresis voltage be increased a bit? In order to achieve a sufficiently small voltage drop on VIN before turning on the external MOS. For example, as mentioned earlier, turn off 34V and then turn it back on (restore) when it drops to 14V.

  • 0 in reply to ?? ?
    TI__Expert 8610 points

    I see. This is not a directly adjustable parameter, however you can rely on a form of voltage monitoring and using your INP/EN controls to keep device off until you have reached desired 14V. Or you can consider adjusting your OV level to be closer to an ideal operating range so the hysteresis is not an issue. 

    Thanks,

    Sarah