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LTC4267-1 PoE design 12V output Issue

moonsunshoot

Hi all,

 

I have done the design as per the LTC4267-1 application circuit and I am using the PA1135NL 12V output transformer, But Getting 3.3V output only, Can anyone please help with this issue. I have attached the design here.

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  • That's odd. Have you used a TLV431 (that has a 1.25V reference)? Most ordinary 431 type devices have 2.5V references, which would suggest 6.6V with the resistor values you have, not 3.3V.

     

    Perhaps you'll need to do more than just change the potential-divider values. Maybe the drive side is limiting in some way as well.

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  • That's odd. Have you used a TLV431 (that has a 1.25V reference)? Most ordinary 431 type devices have 2.5V references, which would suggest 6.6V with the resistor values you have, not 3.3V.

     

    Perhaps you'll need to do more than just change the potential-divider values. Maybe the drive side is limiting in some way as well.

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