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TPS2376-H versus TPS2378

David Escandon
Expert 2175 points
Other Parts Discussed in Thread: TPS2376-H, TPS2378

TI Team,

I was wondering if I could get your opinion on the following.

I currently have the TPS2376-H designed into my circuit using the evaluation board reference design. I've added ORing diodes to my design, and have bypassed the DC/DC converter portion of the evaluation.

My question is about using the TPS2378 as an alternative. As you know, this device has the APD feature, which allows an external DC/DC source to provide power. Here are my two queestions:

1. With the APD feature, I shouldn't have to use ORing diodes in my design, right?

2. Will the T2P work for passive PoE, or a non-type 2 injector?

3. What's the best way to implement the power good signal? Should we use the TPS pin?

Your advice is greatly appreciated.

-David

  • 0
    TI__Mastermind 42795 points

    Hi David,

    1. With the APD feature, I shouldn't have to use ORing diodes in my design, right? The ORing diodes are still required for reverse voltage protection.

     2. Will the T2P work for passive PoE, or a non-type 2 injector? T2P will only activate if TPS2378 receives the two-event hardware classification from the PSE or if the APD pin is above 1.5V.

    3. What's the best way to implement the power good signal? Should we use the TPS pin? Use the CDB pin for this purpose. CDB can be used to hold off the dc/dc converter or can act as an active high, power good signal. With a pullup and capacitor to RTN you can set some delay as well.