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TPS53513: OCP threshold when TRIP pin is shorted to GND or floated while running

keita.shoji
Prodigy 210 points
Part Number: TPS53513

Hi,

We are assessing the failure mode of the converter design. We would like to know if OCP threshold will change when TRIP pin is shorted to GND or floated while the converter is running.

From the datasheet I'm assuming the following behavior:

  • if TRIP is shorted to GND then OCP threshold becomes 0A and converter will eventually shutdown.
  • If TRIP is floated then OCP is effectively disabled and converter will continue running.

Can you clarify that my assumption above is correct or not?

Best regards,

  • +1
    TI__Genius 11315 points

    Hey Keita,

    The part handles the TRIP pin as an analog pin, meaning that it is constantly monitored by the part to check if it is above OCP setting.

    With this being said, according to the calculation on the datasheet, having a 0ohm resistor to GND from the TRIP pin will result in an OCP value of 1.15A.

    When the trip pin is floating, it's theoretical limit is infinite, but the datasheet recommends Rtrip keeps the OCP setting at a max of 12A. Anything more will damage the device. It is only rated for 8A.

    Seeing as this is an analog pin, a change will occur if the resistor is changed during operation. 

    Thanks,
    Caleb