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TPS61193-Q1: threshold 2 of VIN_OVP

Takao Yamamoto5
Expert 1690 points
Part Number: TPS61193-Q1

Dear all,

Can I think 'VOUT > VSET_DCDC + 6~10V' as 'OUTx voltage > LOW~MID_COMP + 6~10V'?

I think like this because Vout is regulated by feedback from OUTx voltage in order to operate between headroom window.

Best regards,

  • 0
    TI__Expert 4565 points
    Yamamoto-san,

    Yes, your understanding is right. Boost target voltage is set to make OUTx voltage between LOW and MID comparator, and OVP fault will be triggered when this voltage becomes too high(+6~10V). Another OVP case can be detected by FB pin directly without OUTx voltage. If Vout is raised by high Vin level or shorted to higher voltage rail, so Vout is even higher than its max Vout decided by FB resistors, OVP fault can be also detected.
    Hope this helps, and you can also send me an email as I mentioned before. I'm supporting all automotive LED drivers in JP area.
  • 0 in reply to Sung Ho Yoon
    Expert 1690 points
    Hi Yoon-san,

    Thank you for your answer.
    I would like to check one thing about your mention 'Another OVP case can be detected by FB pin directly without OUTx voltage.'.

    Do you mean that the over voltage fault detection has three ways?
    1. Vin > 42V
    2. Vout > Vset_dcdc + 6~10V
    3. Vout > Vout_max (←this is detected by FB setting)

    I will send you an email from next questions. Thank you for your support.

    Best regards,
  • 0 in reply to Takao Yamamoto5
    TI__Expert 4565 points

    Yamamoto-san,

    Your understanding is correct.

    For #3 case above, as an example, if max Vout is set to 25V by FB resistor divider, and Vin is higher than 35V, it will cause much higher FB voltage by high Vin resulting high Vout, and trigger OVP fault as well.