IC Controller for project an INJECTOR to supply Ethernet

Hi, I have already realized a PoE splitter with your LT4295IUFD 

Now i must project the reverse: an INJECTOR with power supply Input AC/DC 12/24 Volt -> for supply 48 Volt about on the Ethernet line.

This is for supply the my factory Ethernet Devices like PoE Camera. The power to supply is not to much... about 10-30 Watt...  

There is a Chip controller LT or other Analog for this functions ??   (i need single channel)

Many Thanks

Parents
  • May be the LTC4279 (DEMO MANUAL DC2541A) with a Boost DC/DC Converter Power Supply (24V to 55V/57V) may be the best choice ??

  • +1
    •  Analog Employees 
    on Mar 8, 2019 1:06 AM over 1 year ago in reply to archi

    Consider the DC1860B, LT3748 flyback, 10V to 15V input, 52.5V @700mA output for a single port Type 2 (30W PSE out) PSE or two ports Type 1 (15.4W PSE out) PSE.

    Also consider the DC2306A, LT3753 forward, 10V to 54V input, 54V @1.5A output.  This has a wider input range higher output power for a single port PSE upto LTPoE++ 52.7W (PD input) , or multiple Type 2 and Type 1 ports.

    The DC2541A, LTC4279 is a good choice for single port Type 1, Type 2, and LTPoE++ PSEs.

    The specified power range of 10W to 30W does not call out where the power is in the system.  Consider 100m cable drop and design your system accordingly with the above options.

  • Hi , All clear! and thank you very much for your answer,  Only last question, last suggestions:

    The my Input Power Supply come from a Toroidal Transformer with class B insulation for transformer and double insulations in the primary (230V~) and secondary wire (24V~).  In addition he has a thermal cut-out. I use a rectifier and filter bridge to have about 35 Volt=.

    I take more than 6 mm rigid insulation and distances from all the PCB and cable path.

    With this Voltage i want use an easy step-up converter not isolated without flyback or forward RF transformer, but with single power inductor. Because the insulation is made from the primary Toroidal Transformer i think!.

    MAY BE CORRECT ??                                                                                         thanks

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  • Hi , All clear! and thank you very much for your answer,  Only last question, last suggestions:

    The my Input Power Supply come from a Toroidal Transformer with class B insulation for transformer and double insulations in the primary (230V~) and secondary wire (24V~).  In addition he has a thermal cut-out. I use a rectifier and filter bridge to have about 35 Volt=.

    I take more than 6 mm rigid insulation and distances from all the PCB and cable path.

    With this Voltage i want use an easy step-up converter not isolated without flyback or forward RF transformer, but with single power inductor. Because the insulation is made from the primary Toroidal Transformer i think!.

    MAY BE CORRECT ??                                                                                         thanks

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