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TPS2490 Von / Voff Thresholds

Mike Segal
Expert 7255 points
Other Parts Discussed in Thread: TPS2490

Any recommendation on a circuit to increase the Von / Voff thresholds on the TPS2490? 

For example, setting Von ~ 40V and Voff ~ 34V ?

Thanks,

-- Mike --

  • 0
    TI__Genius 9415 points

    There is an app note SLUA337 found on the the TPS2490 product page. I'll attach it if I'm lucky.

    slua337a.pdf
  • 0 in reply to Bob Kando
    TI__Expert 7990 points

    With a somewhat lower accuracy, and some provisions in functionality, it is possible to add a resistor from the output to the EN pin (R1 & R2 per the page 1 schematic)  to add some additional hysteresis to the existing internal hysteresis. 

    Untested values might be something like R1 = 57.6K, R2=2K, Rfeedback=604K.

    If the input voltage is between the thresholds and the output is shorted, the 2490 will be disabled.  Also, this assumes that the output is pulled (fully) low when off.