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LMR51610: Power protection for LMR51610

Shashank TS
Prodigy 100 points
Part Number: LMR51610

Tool/software:

Hello,

From the below schematics, is it better to have PTC fuse first and then TVS as shown or vice versa to protect LMR51610. The PTC is rated for 60V, Itrip is 700mA and TVS Vclamp is 69.4V. LMR51610 has max Vin of 70V. Is this ok?

  • 0
    TI__Mastermind 27560 points

    Hi Shashank,

    Your PTC and TVS placement is fine. As noted in the DS, if operating outside of recommended range but within absolute maximum range, the device may not be fully functional and may affect the device performance and reliability. If needed, we have higher input rated devices that could support your application. 

    Thanks,

    Richard

  • 0 in reply to Richard Fu22
    Prodigy 100 points

    Is bidirectional TVS recommended here considering it's for an automotive application and there will not be any negative supply(-V). Do you suggest using bidirectional TVS to protect downstream incase the supply is connected in reverse? In DS I see LMR51610 has max Vin as 71V, I want to know if I need to go for a lesser Vclamp TVS(Now its 69.4V)

  • 0 in reply to Shashank TS
    TI__Mastermind 27560 points

    Hi Shashank,

    The idea is that the Vclamp and Vbr should be in between the maximum input voltage and the absolute max of the device. 

    Bidirectional TVS can help if supply is connected in reverse, but even then, I think there is a chance that there will still be some damage.

    Thanks,

    Richard