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TPS2HB50-Q1: Overcurrent Behavior

Alexander Raisle
Prodigy 140 points
Part Number: TPS2HB50-Q1
Other Parts Discussed in Thread: TPS1HC30-Q1, TPS2H160-Q1, TPS4HC120-Q1

Tool/software:

Hello all,

I tried to switch on an capacitive Load which is about 100µF. But in that moment I switch that on overcurrent is detected and the switch will turn off immediately. I checked the power supply, this is not the issue.

Am I right, that I cannot switch a capacitive load with this switch? What do I need to do to switch such kind of a load with TPS2HB50-Q1?

I want to avoid additional losses by adding a resistor in series to limit current.

Thanks in advance!

Best regards, Alex

  • +1
    TI__Mastermind 29210 points

    Hi Alex,

    These "HB" family devices shut off immediately when the overcurrent limit is hit. To charge this cap, you can make increase the current limit when the device is enabled to create an inrush period, either with a FET in series with the ILIM resistor or by pulling the pin to GND for some time until the cap is charged, then turning on the FET or making the pulldown signal Hi-Z to enable the regular steady state current limit.

    Or, you can use TPS2H160-Q1, TPS1HC30-Q1, or TPS4HC120-Q1 with 2 channels paralleled for each load. These devices clamp the current at the current limit until they reach thermal shutdown instead of shutting off immediately, making them better for charging large caps.

    Will either of these work for your application?

    Thanks,

    Patrick