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TPS25981: SCH review

Hailiang Zhang
Expert 6675 points
Part Number: TPS25981

Hi Team，

Customer is going to use TPS25981 for optical module port protection. The application scenario is similar to the following figure,


Here are two question:
1. The CR1 is must or not?
Vin spec of TPS25981 is much higher than 3.3V. Also, as checked with layout engineer, CR1/CR2 too large to place on a limited PCB size.
2. Even if a 3.3V TVS is placed next to Vin, when SCP occurs, will the Vin high voltage trigger XP3R3V_IN sources‘(I mean the 12in to 3.3V DCDC ) OVP?

And, could you pls help review the schematic? Thanks!

Regards，
Hailiang

  • 0
    TI__Guru 62495 points

    Hi Hailiang,

    1. For 3.3V rail TVS can be skipped from VIN abs max violation perspective. But VIN is tied to EN and EN max rating is 6.5V. So it is not looking much probable but EN abs max could get violated.

    2. Did not understand second question? Does DC-DC converter has output side OVP?

    Regards

    Kunal Goel