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Regarding converter selection

sharathkumar jidigam43
Prodigy 100 points
Other Parts Discussed in Thread: UCC28600, UCC28810, UCC28740, UCC28704, TL431, UCC28730

Hi,

i need a 130V Dc@40w output from 90-264VAc input voltage which converter is best for this applications,i am planing to use flyback converter but during 90 to 95 volts input is less than out put it work as step up converter after this out put is less than input so is good to go with flyback or any other converter please suggest me.

Thanks. 

  • 0
    TI__Mastermind 31580 points
    Hi,

    With the correct turns ratio a flyback design will be able to deliver the 130V dc output when the input is at 90 to 95V.

    Take a look at this blog, e2e.ti.com/.../how-to-design-your-power-stage-quite-conveniently, which contains links to TI's power designer which will help you with your design.

    Regards

    Peter
  • 0
    TI__Genius 9130 points
    Sharathkumar,

    You can search the library of existing TI Designs and Reference Designs here:
    www.ti.com/.../refdesignsearchresults.tsp

    Click on the button "Search power reference design parameters", then you can refine the search for input voltage range, AC input, isolated output, etc.

    For an input voltage range of 90-264 V ac, and for an isolated output of ~80-140 V, there are 2 results:

    1. http://www.ti.com/tool/PMP3597
    This is for ~80 V output at 0.35 A, for LED's. This could be adapted to 130 V for your application. It uses the UCC28600 QR Flyback controller


    2. http://www.ti.com/tool/PMP4862
    This uses the UCC28810 lighting controller to generate a 120-V DC isolated output at up to 1.2 A, which is then used by other DC-DC stages on the secondary to drive the LED's. This UCC28810 drives a single-stage Flyback PFC, but is much higher power than you require.


    Solution #2 may not be so suitable since you do not need PFC, and solution #1 above would need some redesign for the higher voltage you need.


    For your power level, a flyback in DCM or QR/valley-switching is probably the best solution to consider. Since a Flyback operates by storing energy in the primary during the on-time and releasing that energy during the off-time Flyback interval, it can be used to regulate Vout when Vin can vary over a range from less than Vout to greater than Vout.


    You could consider some of TI's newer dedicated valley-switching flyback controllers:

    - UCC28740 (includes HV startup for VDD, opto feedback for tight output regulation)
    - UCC28704 (Primary-Side-Regulated (PSR) eliminates secondary side opto + TL431 for lower cost and loser standby power.
    - UCC28730 (PSR with HV startup, designed for ultra-low standby power)



    I hope this helps answer your question, if so please click the "verify answer" button.

    Thanks,
    Bernard
  • 0 in reply to Bernard Keogh
    TI__Genius 9130 points
    There are also design tools available for UCC28740, UCC28740, UCC28730 etc on the product folders, such as Excel design calculators, and Webench design tool.