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  • TI Thinks Resolved

ISO1212: use in TPS2373's TPH/TPL/BT pin to isolate LED

Part Number: ISO1212

Dear expert,

My customer uses our TPS2373 and TPL/TPH/BT pins LED indicator need to be isolated. But TPS2373 datasheet (P33) suggest them to use photos to isolate. Could you please help check if ISO121x is suitable for this application? If yes, could you help provide the reference circuit including the connection and Rthr and Rsense value. Very appreciate your help.

P.S Vc is 12V.

Regards,

Polly Chung

  • Polly,

    I am consulting with another expert on the matter. In the mean time, I have some questions. Is Vdd 12 volts as well? What is the voltage for the secondary side?

    Respectfully,
    Lucas
  • In reply to Lucas Schulte9:

    Dear Lucas,

    Thanks for your reply.
    VDD is POE input, so it will be 40-57V. And they has 5V in secondary side. Thank you.

    Regards,
    Polly Chung
  • In reply to Polly Chung1:

    Polly,

    Here is the schematic that would work to isolate the LEDs with the ISO1211. The ISO1212 would be similar but with 2 channels. Also be sure to choose the proper Rthr and Rsense for this application as per the datasheet.

    -Lucas

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