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TPS25942A implement ORing cotrol

Other Parts Discussed in Thread: TPS25942A

Hi sir,

Currently my customer use TPS25942A implement ORing control for POE, please help us comment this schematic, thanks.

We expect a POE input and a DC input, and set POE priority first,

use POE's PGOOD connect to the DC's DEVSLP, so that DC side into Diode mode when POE power supply as show below FIG.

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Hi Sir,

I design ORing circuit use TPS25942 and setting POE Voltage is pilority first.

In general, when remove POE power, first see Voltage is down and PG also see that, is right?

But after 500us, PG voltage occur pluse effect system voltage drop. (show FIG1.)

Add dumy load 50 ohm to verification, improve a little. (show FIG2)

May I know  why the pulse occurred on the PG??

FIG1.

FIG2.

May I know dV/dT over mean is high/low for Logic?