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TPS630250 / Short circuit protection

S.Satoshi
Guru 21685 points
Other Parts Discussed in Thread: TPS630250, TPS63060

Hi,

Please let me ask about short circuit protection of TPS630250.

  1. Please let me know when short circuit protection start to work. Is it started after output voltage has reached 90% of its nominal value?
  2. The datasheet describes that "When the output voltage does not increase above 1.2V, the device assumes a short circuit at the output", then which does it monitor VOUT or FB pin?

Best Regards,

Sonoki

  • 0
    TI__Expert 8420 points
    1.No, it starts working when Vout is arround 1V to 1.2V
    2. VOUT pin
  • 0 in reply to Sabrina
    Guru 21685 points

    Hi Sabrina,

    Let me ask one more question for your answer #1. You commented that the short circuit protection will start to work around 1V to 1.2V, but then I believe that the Vout can't rise at power-up with hard shorted condition. How do you think about it?

    Best Regards,

    Sonoki

  • 0 in reply to S.Satoshi
    TI__Expert 8420 points
    Actually the short circuit protection is only a current limiting feature during start up to avoid current to run away. It does not shut down the device.
    Thus the converter starts in this condition and once the comparator detects that Vout>1.2V the current flowing out of the device is no more limitted.

    The same during operation: if there is a short circuit, the short circuit protection will immediatly start to limit the current flow
  • 0 in reply to Sabrina
    Guru 21685 points

    Hi Sabrina,

    Let me ask one more another question.

    The description of short circuit protection in datasheet page 9 states that the input current is limited to 4A, but I believe that it's limited to "Average input current limit". And so the limit will depend on input voltage and temperature like Fig.5 in datasheet. Is my understanding correct?

    I guess it because there is following description in TPS63060 datasheet.

    During a short-circuit situation on the output, the device maintains the current limit below 2 A typically (minimum average inductance current).

    Best Regards,

    Sonoki

  • 0 in reply to S.Satoshi
    TI__Expert 8420 points
    Yes, the device limits the average input current to 4A during short-circuit. As you said the input current depends on the operating conditions but will not go above 4A if a short-circuit is detected.
  • 0 in reply to Sabrina
    Guru 21685 points
    Hi Sabrina,

    Thank you for your comment. I understand that the average input current may be over 4A at normal operation as Fig.5, but it will not go above 4A at short circuit condition. Is my understanding correct?

    Best Regards,
    Sonoki
  • 0 in reply to S.Satoshi
    TI__Expert 8420 points
    Yes correct