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TPS2372: TPS2372

Daniel Campano
Intellectual 470 points
Part Number: TPS2372

Hi,

I'm developing a BT Power device and  I want to use the TP2372-4. I'm trying to make compaltible our  product with complaint injectors and non complaint injector. I'm having problems to figure out how to make the BT power device compatible PoH PSEs and  with  IEEE802.3af/at/bt injectors at the same time. My power device needs to be clasified as class 6 ( it needs 42w at the PD), but if I set my PD as Class 6 it won't be powered up by a PoH ( which can just interoperate with Class 4 or less).  I could place a switch to change the CLSB between Class 6 and Class 4 but I would like to avoid that solution as it relays on end user doing somehting. Is there any way that I could detect the injector being a PoH and change automatically from Class 6 to Class 4?, or any otehr solution that I could use?.

Thanks in advance,

Daniel.

  • 0
    TI__Mastermind 40100 points
    Hi Daniel,

    Because PoH is so different from the IEEE802.3BT standard (particularly in the classification phase), you must use some switch (or relay) to change the class resistor for PoH to work correctly (with Class 4-only resistors) with the TPS2372.

    What I have noticed in general, is that this type of application was prominent while the standard was not published yet (but BT-ready ICs were available in the market). However, now that the standard is available, a lot more end equipment are solely making the end products BT compliant as the main focus is interoperability as non-standard products will be less available. Below is a link to some training regarding PoH and our PoE PD devices for your reference.

    training.ti.com/tps23723-working-noncompliant-high-power-pses-upoe-poe-and-poh