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UCC28711: Flyback controller recommendation for Ultra Wide Input

Part Number: UCC28711

Hi,

I want to design a power supply with the following specs:

AC input voltage: 90-800 VAC 

Flyback input voltage: 130-1200 VDC

Output 1: 48V/40 mA -> 2W

Output 2: 12V/80 mA -> 1W

Aux winding: 18V/100 mA

Could UCC28711 in quasi resonant mode achieve good performance in this wide range? Do yo have another suggestion? 

  • Hello,

    Texas Instruments has a reference library that you can search to see if there is a design that meets your current needs.  The following link will bring you to the reference design library.  The user types in the input and output power requirements and the closest matches will come up.

    There is a Webench tool for this device, however, it is limited to 480V AC.  However, there is an excel tool that can be used that has no such limit.  You can find the link to this tool as well.

    This tool only does one output.  However, you can do multiple outputs. By doing the following.

    1. Paper design assuming one output has all of the power.  This will calculate the primary magnetizing inductance and the designs front end RMS currents and peak currents and turns ratio.

    2. Due the design again with one output and then the next.  This will give the peak currents and RMS current on the secondary; as well as, turns ratios.

    If you are not charging a battery.  I would suggest that you set the Np/Ns(12V) = Np/Na.  In this way the VDD of the UCC28711 will be regulated at 12 V.

    Regards,