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TPS2373: PoE reference design for a PCB with space limitation.

Samuel Escobar
Prodigy 10 points
Part Number: TPS2373
Other Parts Discussed in Thread: , PMP22477, TIDA-050045

Tool/software:

Greetings,


We are designing a Power over Ethernet (PoE) solution to power our boards. We currently need 3.8V  and 7A to 8A and we need isolation between power stages. We want to use the IEEE 802.3bt protocol, foreshadowing a higher power need in the future.  Looking at the TPS2373 we found some reference design HERE. The thing is we have some space limitation in our PCB and we were wondering if there is a design that would take less space, for example we dont need to have an alternative power port. Also we don't need to have a DCDC that lowers the voltage to 3.8V we can have 12V and then lower it afterwards. Any pointers, suggestions, recommendations are welcome.

Thanks beforehand :D

Samuel

  • 0
    TI__Mastermind 37111 points

    Hi Samuel,

    For PoE PD input power less than 51W and isolated DC/DC design, TPS23730 is recommended in general. Compared with TPS2373, TPS23730 integrated PWM controller so it will be a singe chip solution.

    We have below reference designs may help

    PMP22477, PSR flyback converter, 12V/3.8A output, (you can delete the page 3 power limiting circuit in its schematic)

    TPS23730EVM, active clamp forward converter, 12V/5A output

    TIDA-050045, active clamp forward converter, 5V/10A output, can adjust the error amplifier circuit and transformer, secondary circuit to make it 3.8V to save a step down converter.  

    Best regards,

    Diang