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TPS27S100: Current limiting application

Randy Chen
Intellectual 1670 points
Part Number: TPS27S100

Hi,

My customer is looking for a high side power switch solution with current limiting feature. Can you please comment if TPS27S100 is good fit the application?

Design requirements:

1. Operating voltage: 20V

2. Programmable current limit threshold: 4.5A and 6.75A

3. The output current is clamped and the output voltage is dropped when the current limit threshold is hit.

Best regards,

Randy Chen 

  • 0
    TI__Expert 3500 points

    Randy-


    As long as the DC current is below 3A to 4A, the TPS27S100 should be a good fit for this application and can meet all of these requirements! I would definitely recommend this part to your customer. If you have additional questions that are customer specific, please email me at alec.forbes@gmail.com

    Thanks,

    Alec

  • 0 in reply to Alec Forbes
    TI__Intellectual 1670 points

    Hi Alec,

    What if the Nominal DC load current above 4A? Says 6.75A(max) and the current limit threshold set to 6.75A. Any other alternative solution? 

    Best regards,

    Randy Chen

  • 0 in reply to Randy Chen
    TI__Expert 3500 points

    Randy-

    Is the max DC current 6.75A or is the desired current limit setpoint 6.75A? There will have to be a difference between the two values as some margin is needed to avoid false trips. If the device actually needs 6.75A DC current, the best option will be the TPS4H160 with all the channels paralled so that there is an equivalent 40mOhm switch. This document explains the details of that: http://www.ti.com/lit/an/slva949/slva949.pdf.

    If you need lower on-resistance, we do have the TPS1HA08 which can clamp an overcurrent event, but has a fixed current limit at 20A. If you need an adjustable current limit, the TPS2HB16 can output 6.75A current and has an adjustable current limit, but in the event of an overcurrent, will shut off the output rather than clamping the current.

    Hopefully one of those options works for you, let me know if there are any follow up questions.

    Thanks,

    Alec