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TVS2700: Best way to interpolate for different surge shapes

steven heitbrink
Prodigy 30 points
Part Number: TVS2700

Tool/software:

Hi, 

I have a design requirement where I need to survive a IEC 610004-5 pulse with a 1.2/50us surge instead of a 8/20us used like in the data sheet, and the typical test. If I do straight line interpolation between the 8/20us, and the 10/1000us max surge current, it looks like we have some head room.  I'm interpolating between the 2 points given by the decay time vs max surge. So the two points are (20us,40A) and (1000us,4A).

 

My question is: do you think this is a reasonable method to estimate max surge current?

  • 0
    TI__Intellectual 1320 points

    Hi Steven,

    Can you clarify if the 1.2/50us is the voltage waveform or the current waveform? Under IEC 61000-4-5, the surge generator will deliver a 1.2/50us voltage waveform in open circuit, and a 8/20us current waveform in short circuit.

    The datasheet lists 8/20us in reference to the current waveform, as the voltage will be dependent on the device's clamping characteristics once under test.

    Best,

    Chris

  • 0 in reply to Chris Pui
    Prodigy 30 points

    Hi Chris,

    Thanks for pointing that out. The 1.2/50us came out of the UL standard 294. I'm following up with the UL to clarify the meaning.