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TLV627432: OCP test

Peter Xu
Expert 4475 points
Part Number: TLV627432

Hi team,

My customer test OCP and the waveforms are attached. When it is shorted, the current keeps at 800mA and the output voltage is pulled down to 62mV. I know that OCP is achieved by cycle-by-cycle detection. But why does the output voltage pull down? My customer still wants to know whether the device has life problem if it runs in OCP mode for a long time. As the temperature is high when OCP occurs, is there any safety problem?

Pic 1: Input current(Yellow line), Output voltage(Blue line) 

Pic 2: SW point waveform in OCP mode

Best Regards,

Peter

  • +1
    TI__Genius 16530 points

    Hello Peter,

    Thank you for using E2E form.

    Peter Xu said:
    why does the output voltage pull down?

    You are applying the using the maximum current limit on the high side FET, which leads to limit the ON time of the high side FET, further leads low VOUT.

    cycle by cycle current protection works as mentioned in the datasheet.

    Peter Xu said:
    My customer still wants to know whether the device has life problem if it runs in OCP mode for a long time. As the temperature is high when OCP occurs, is there any safety problem?

    I don't see thermal shutdown option in this device, if you are running the device in OCP for long time, it might lead to increase the temperature of the device and if the device is operating beyond the recommended operating temperature conditions then their might be some reliability issues. 

    Thank you,

    Regards,

    Moheddin.