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TPS1H100-Q1: The instantaneous current exceeds the set value when starting

ni ni
Prodigy 60 points
Part Number: TPS1H100-Q1

Hi：

In our AVM surround view system, we use the TPS1H100-Q1 to control the power supply of four cameras. We set the current limit value of the TPS1H100-Q1 to 600mA, and the instantaneous current value of our single camera is about 500mA, and the steady-state current value is 120mA; the instantaneous current of four cameras together is 1A, and the steady-state current value is 480mA. The current during the start-up of a single camera and four cameras is tested as follows:

With this setting, will the starting current of our camera immediately trigger the overcurrent protection of the TPS1H100-Q1? Does the overcurrent protection of the TPS1H100-Q1 protect when the current reaches the set value or does it require the current to exceed it for a period of time? How long is this time?

Thanks！

  • 0
    TI__Mastermind 19040 points

    Hi Ni Ni,

    When TPS1H100-Q1's current limit value is reached, the device regulates the output voltage in order to limit the current at the ICL setting (600mA) - please see the image below from the data sheet. The device continues to limit the current until the overcurrent condition is removed, the thermal shutdown temperature is hit, or the device is disabled.

    So the device will immediately start limiting the current if it exceeds the ICL setting. This could cause an issue if a camera is running and the others instantaneously start up - this would exceed the ICL and the device would start limiting current, which would subsequently lower the device's VOUT. Perhaps you would consider raising the ICL limit, especially since at 0.5A < ICL < 1.6A, the current limit is spec'd within 20% accuracy, which would bring your current ICL to 480mA min, 600mA typ, 720mA max.

    Thanks,

    Patrick