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TPS2H160-Q1: In-rush current tripping current limit

Tyler Holmvik
Intellectual 891 points
Part Number: TPS2H160-Q1
Other Parts Discussed in Thread: TPS1HTC30-Q1, TPS272C45

Hi, 

My customer is encountering issue where they have two 10W bulbs on the output of the TPS2H160-Q1. With CL = 1.8A, the device goes into constant reset (due to high inrush current). Vs = 24V so steady-state current is around 840mA for the two bulbs. The inrush current of the bulb is about 10x that of steady state, so about 8.4A. When CL = max the current limit does not trip (which is good), but setting CL to max defeats the purpose of the current limit. 

My questions are:

-are there any options here to limit in-rush while still using the TPS2H160-Q1?

- or to prevent the current limit from tripping during in-rush period?

I can propose the TPS272C45 but that does come at a higher cost, which also isn't ideal.

Thanks,

Tyler

  • +1
    TI__Mastermind 34905 points

    Tyler,

    Generally for bulb loads the idea is to set the current limit high enough where the current limit does not trip. For a 10W bulb load, we would typically see inrush currents up to 15A and would recommend the TPS1HB35F-Q1. We have an application note that would go over this here:

    https://www.ti.com/lit/pdf/SLVAF91

    Do note though, that the Hxx, HBxx, and HCxx high-side switches are made primarily for 12V automotive applications. They are not designed to handled 24V automotive transients such as load dump or short-to-ground. For this, we would recommend the TPS1HTC30-Q1.

    We do have some potential roadmap devices in the near future that might be a good fit for this application (please follow-up offline here). 

    The TSP272C45 might work here as you can actually set a separate current limit during the inrush duration via the ILIM pin, however keep in mind that this device is not automotive rated and does not have the relevant AEC qualifications.

  • 0 in reply to Timothy Logan
    TI__Intellectual 891 points

    Thank you for the quick reply.

    This is not for automotive application, so non-Q1 devices will suit the customer's needs. I'll run with the TPS272C45.

    Tyler