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TPS22950: Behaviour not as expected

Andre Lochner
Prodigy 20 points
Part Number: TPS22950

Good day,

I am testing the chip TPS22950CDDCR with Ilim resitor set to 22k. I am expected the device to drop the voltage when current exceed 50-60mA. This seem to happen only if I set my load switch to current higher than 60mA and then power and enable device. When the device is already enabled and powered and I slowly increase the load the device. Over current protection never activates and I can go to 100mA and above and output voltage is still the same at 3.3V. 

From my understanding the over current protection should limit the current and then drop the output voltage. Does does note seem to happen.

Please explain if I am misunderstanding how the device functions

Kind Regards

Andre 

  • 0
    TI__Mastermind 18220 points

    Hi Andre,

    The circuit that detects the overcurrent condition is inherently less accurate at lower currents - you are not misunderstanding the device functionality. What current does it trigger at? When the current limiting starts, the device will limit the current to within the ILIM specification, but the overcurrent threshold specification is actually ILIM,PEAK.

    Thanks,

    Patrick