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TPS1HC30-Q1: Short-circuit behaviour

Salil Joshy
Prodigy 40 points
Part Number: TPS1HC30-Q1

Tool/software:

Hello,

I am using the HS driver to drive a coil.

The current limit set is 3.5A and latch pin is set to logic high so that there is no retry during fault.

In the condition when the coil is being driven with 1.5A, the output of HS driver is shorted to ground.

The waveform of the current through the HS driver during this short condition does not confirm to the explanation in the datasheet.

The current is seen as discontinuous even though it should not be according to fig 8.13 of datasheet.

Would you please help to explain this condition?

Kind Regards,

Salil 

  • 0
    TI__Genius 10225 points

    Hello, 

    The figure compared to the waveform is for when latch is low which enables the Tretry function. Under that figure in the datasheet it says: 

    In this state, high power is dissipated in the FET, so eventually the internal thermal protection temperature for the FET is reached and the device safely shuts down. Then, if LATCH pin is low, the part waits tRETRY amount of time and turns back on.

    Please test with latch low to ensure this behavior is correct. 

    BR, 

    Alan

  • 0 in reply to Alan Whitehead
    Prodigy 40 points

    Hello,

    Would you please provide details of device behaviour when LATCH pin is high?

    Because in our application, we do not want retry to happen.

    Kind Regards,

    Salil 

  • 0 in reply to Salil Joshy
    TI__Genius 10225 points

    Hello Salil, 

    The Latch off mode functionality is described below.

    Latch-off mode: The device is enabled into an overcurrent event. The DIAG_EN pin is high so that diagnostics can be monitored on SNS and FLT. The output current rises up to the IILIM level and the FLT goes low while the SNS goes to VSNSFH. If the part shuts down due to a thermal fault, either relative thermal shutdown or absolute thermal shutdown, the device does not enable the channel until either the LATCH pin OR the EN pin is toggled.

    Do you have a schematic of your application?

    What load are you using when testing this? E-load in CC mode?

    BR, 

    Alan