LM25066A: How to decrease the instaneous overshot of input voltage on LM25062/6

Richard Yang1

Part Number: LM25066A

Hi Team:

There is an potential system risk if using 2 separated Hotswap LM25062 to produce P12VA and P12VB(PSU_P12V_VIN ---->P12VA&P12VB):

Since 2 large current Efuse share one common 12VIN, OV or Over current fault may be triggered when one rail short to GND. You can see the overshot of P12V_VIN may up to 15V.

So any solution could avoid this risk? How to decrease this instantaneous overshot? using A TVS or other solution to decrease it.

Thanks!

over 4 years ago

0 Praveen GD over 4 years ago

TI__Guru 57737 points

Hi Richard,

What is theFast trip threshold that you have set for the two rails ?

Appropriate selection of TVS and placing it close to the Controller should reduce the Vin over shoot.The TVS selected should be such that the clamping voltage for the fast trip threshold should be less than OV trip point voltage value.

You can go through the attached document to select the right TVS.1425.TVS Clamping in Hot-Swap Circuits.pdf

0 Praveen GD over 4 years ago in reply to Praveen GD

TI__Guru 57737 points

Hi Richard,

Is your issue resolved ? In case you do not have more queries, can we close this thread ?

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LM25066A: How to decrease the instaneous overshot of input voltage on LM25062/6