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TPS2491: Using Enable Pin

Part Number: TPS2491
Other Parts Discussed in Thread: TPS1663, TPS2663

Tool/software:

I have an application for which I want soft start to cope with large capacitive loads. I am not sure which of hotswap controllers, eFuse or High side switch are are the best solution for my application.

When input power is connected, the loads are disconnected. Sometime later the module output (actually a h-bridge driver stage) is enabled and the load is connected. There may be a large capacitive load downstream of the H-Bridge.

Input voltage range is 12 - 25 V. Output current when the load is connected is 2.5 A or 5 A max (I would like to consider both).

The TPS2491 looks interesting and the design calculator suggests it can keep my chosen MOSFET in the SOA.

My question is will the hotswap controller work as expected if it is initially held disabled. I.E. power up the module with the H-Bridge and thus the load disabled. Then, some time later, enable the H-Bridge and enable the hot swap controller. Is this close enough to "hotswap" operation to work?

Andrew

  • Hello Andrew,

    Thanks for reaching to E2E.

    You can enable the controller from EN when load is connected.

    You can check TPS2663/TPS1663 smart eFuse with integrated FET.

    It has UVLO pin which can be used to enable the eFuse.

    Thanks 

    Amrit