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TPS2372: TPS2372 - Active bridge question?

Jason Dai
Expert 3720 points
Part Number: TPS2372

Dear E2E,

Customer is asking about active bridge circuit which we did in tps2372-3 (half active bridge) and tps2373-4 (full active bridge) EVM board.

First question is how to select the right topology of active bridge circuit in type 3 and type 4 application?

In half active bridge topology, we found that BJT driver has been removed and directly diven by PoE voltage.

If so, could we remove BJT also in full active bridge topology?

BR,

Jason

  • 0
    TI__Mastermind 41790 points
    Hi Jason,

    1. It depends on the overall efficiency a PoE design is trying to achieve. Typically, it will ~1-2% better efficiency when using a full FET bridge over a diode/FET bridge. So far what I've seen is most Type 3 applications will use FET/diode bridge while most Type 4 will use full FET bridge.

    2. Note it is NOT recommended for full FET bridge to use the similar driving circuit in FET/diode bridge. It has been tested in the past and there could be some conditions of component damage when two FET bridges are parallel (like for all PoE designs).
  • 0 in reply to Darwin Fernandez
    TI__Expert 3720 points
    thanks, my POE master.