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TPS1HB16-Q1: Are Smart High Side Switches considered safe as Fuse replacement?

Lukas Maier
Prodigy 20 points
Part Number: TPS1HB16-Q1

Hello,

I am planning to use a Smart High Side Switch like the TPS1HB16-Q1 (https://www.ti.com/product/TPS1HB16-Q1) in a product to drive and protect different loads as seen in the figure below.

I know it is AEC-Q100 qualified for Short Circuit Reliability but does that mean I can use it as a fuse replacement using the adjustable current limit? I read in different application notes that it enables you to use smaller cables, connectors and PCB traces and the figure below doesn't show additional fuses but it is never explicitly mentioned.

Thanks for your help!

From: https://www.ti.com/lit/an/slva859b/slva859b.pdf?ts=1597232222013&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fpower-switches%252Fhigh-side-switches%252Foverview.html

  • 0
    TI__Mastermind 22250 points

    Hi Lukas,

    Welcome to E2E!

    A high side switch is made for rapid changes in impedance at the output. There are also eFuses that can act as a fuse replacement.

    Also, you reference a figure but I am not able to see a figure. Are you referring to a figure in the linked document?

    In addition, see this training presentation for more information on the differences between the eFuse and High Side Switches to ensure it fits your application. 

  • 0 in reply to Anthony P Pham
    Prodigy 20 points

    Thank you!

    Yes sorry I was talking about Figure 1 in this Document. So instead of using a Smart High Side Switch I should use an eFuse at the output for load switching and fuse replacement? Because the documents always show eFuses as Input Power protection and High Side Switches on Outputs. Why are Smart High Side Switches not safe for this but eFuses are, since they are almost identical. Is it the higher reliability and reverse current protection?

  • 0 in reply to Lukas Maier
    TI__Mastermind 22250 points

    Hi Lukas,

    As you've mentioned, there are different purposes for each type of device, the first being eFuses are normally used for input power path protection and High-Side switches for off-board load protection, which you've mentioned. You can find a comparison at this link to see what you need. If you are driving off-board loads and see that the high side switch is suited for your needs, yes Figure 1 works for your needs.

    I can't directly answer your first question as I'd need more information about the  use of the high side switch, but for the second question, I believe the high side switch isn't safe for input is because an eFuse is more advantageous in that it provides over-voltage protection that would affect a load due to a power surge.

    High Side Switches are more to keep a safe disconnect from loads from pulling too much current which is a characteristic based on the operation of the load.