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TPS23753A: Can support 5V @ 2.6A?

ikon
Genius 5355 points
Other Parts Discussed in Thread: TPS23753A, TPS23751, TPS23754EVM-383, TPS23756

Hi Support,

Can TPS23753A support 5V @ 2.6A output?

Since the class 3 standard can provide up to 13W output power.

Cheers.

  • 0
    TI__Mastermind 42795 points

    TPS23753A could be used as a 5V x 2.6A (13W) power supply. But with the efficiency (say 90% for an example) there would be 13/0.9 = 14.4 at the RJ45 input connector which is above a "class 3" or "type 1" requirement (13W max).

    If you need just above the 13W standard, then you need to advertise as a type 2 (up to 25.5W at the RJ45 connector). TPS23753A cannot advertise this power level to the PSE so you would need something like the TPS23751.

  • 0 in reply to Eric Wright
    Genius 5355 points

    Hi Support,

    Any reference design which provide 12V output @ 2.5A?

    Thanks.

  • 0 in reply to ikon
    TI__Mastermind 41760 points
    Hi Shaun,

    The answer is similar to comment on what Eric posted. The maximum power received from the PD through 100m of Ethernet cable is 25.5W. For 12V/2.5A, the power will be 30W and adding efficiency of the PD, will be >30W. This is not IEEE compliant. However, if you're trying to get as much power from the PSE's delivered power, then I recommend looking at TPS23754EVM-383.

    Regards,
    Darwin
  • 0 in reply to Darwin Fernandez
    Genius 5355 points

    Hi Darwin,

    Can I use the J2 (Normal RJ45 Connector, Jack, Modular, 8 POS) and T1 (ETH1-230LD from Coilcraft) in “Pic 1” to replace the J3 (7499511001 from Wurth Electronics) in “Pic 2”.

    Both connection were copied from TI reference design.

    One is from the TPS23756 12V 15W output solution and the other is from TPS23754EVM-383 EVM.

    Thanks.

  • 0 in reply to ikon
    TI__Mastermind 41760 points
    Hi Shaun,
    This mostly depends on the data rate of your application. For 10/100BASET applications, you do what is shown in the TPS23756 reference design. For 1000BASET applications, you can do some form of the TPS23754EVM-383. For example TPS2379EVM below does two separate data transformers.
    www.ti.com/.../tps2379evm-106

    Regards,
    Darwin