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LM7480-Q1: TVS selection for 24-V battery systems

zhirong yang
Prodigy 60 points
Part Number: LM7480-Q1

For the TVS selection for 24-V battery systems, the datasheet page 34 says the breakdown voltage of the TVS+ should be higher than 48-V jump start voltage, how did the 48-V requirement come from? All 24-V battery power automotive system should be higher than this voltage?

  • 0
    TI__Guru 57737 points

    Hi Zhirong,

    The breakdown voltage of the TVS+ should be higher than 48-V jump start voltage, less than the absolute maximum ratings of anode and enable pin of LM7480x-Q1 (70 V) and should withstand 65-V suppressed load dump.

    • In a 24V battery system, there could be a possibility of 48V jump start voltage. Operating a TVS in its Breakdown/Clamp region is not recommended and since jump start is like a DC condition, the  TVS on the positive side is recommended to have its breakdown voltage greater than 48V. 
    • The clamping voltage of the TVS+ during all the transients that can occur in the system should be less than the Absolute Maximum rating of the device which is 70V. 

    Hope I have answered your question.