AC/DC and Isolated DC/DC Power

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AC/DC and Isolated DC/DC Power

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Related Posts

  • Forum Post: Line OVP Design Example for UCC2897A, UCC2892 and UCC2894

    Hong Huang
    on Sep 23, 2009

  • Forum Post: UCC2897A - making ZVS or not, and how-to-design an active clamp forward converter

    Hong Huang
    The paper listed below provides the guidelines on ZVS design of an active clamp forward converter, and explains when ZVS makes efficiency benefit and when not. Hong Huang, "Design guidelines on the effect of resonant transitions of forward converter on efficiency with active clamp", Applied...
    on Aug 31, 2009

  • Forum Post: UCC2897A EVM Design Files

    Hong Huang
    UCC2897A EVM design files are availble through the below links. http://e2e.ti.com/cfs-file.ashx/__key/CommunityServer.Discussions.Components.Files/120/6303.HPA348A_5F00_bom.xls http://e2e.ti.com/cfs-file.ashx/__key/CommunityServer.Discussions.Components.Files/120/0511.HPA348A_5F00_PCB.pdf http...
    on Aug 31, 2009

  • Forum Post: UCC35706 resonant forward convertor failure

    Sunil K Valsan
    Hi, I am Trying to make one DC to Dc convertor with UCC35706, strangely all the four devices I had is gone bad ie PIN 3 Vff shows zero Volt. The schmatic design is taken from another working design. Its resonant single switch forward convertor. Please help me to acertain if the device has gone...
    on Nov 17, 2011

  • Forum Post: LM5034 PWM controller soft start

    jarod salsman
    I am looking for information regarding the shutdown of one PWM channel of the LM5034 chip. The data sheet claims that connecting the soft start pin to an open drain connection allows the user to shut down one channel without affecting the other. I have tested this and found that the second channel actually...
    on Feb 24, 2012

  • Forum Post: ucc2893 duty ratio problem

    ��� ������8
    I design specifications of DC to DC isolate forward and used high-side N Channel is as follow: input voltage: 100V output voltage: 12V output current: 0A~10A switch frequency: 100kHz duty ratio maximun : 0.45 When i testing , load is used Electronic load and set to constant current mode from 0A Gradually...
    on Jul 10, 2012

  • Forum Post: UCC2897A common line and VDD rail?

    Olli Mannisto
    Is it possible to use the UCC2897A controller using +15V voltage for both line and VDD? I suspect there might be a gotcha with regards to the relative voltage levels. Datasheet suggests +18V minimum for line voltage. I'm intending to use the UCC2897A as a high-voltage flyback controller. High voltage...
    on Feb 15, 2013

  • Forum Post: UCC2893 Active Clamp Forward Efficiency Problem (<80%)

    Guilherme Müller
    Hi, My name is Guilherme Muller and I’m developing a step-down SMPS using UCC2893 from Texas. My benchmark is ~90% of efficiency, so I’m using an active clamp forward converter with synchronous rectification, similar to UCC2897A EVM. This is my first SMPS, so I’m having a lot...
    on Feb 25, 2013

  • Forum Post: UCC2897A datasheet timing parameters

    Olli Mannisto
    The datasheet and design guide SLUA535 are not in agreement about how to calculate the RON/ROFF/RDEL. SLUA535 equations 97 thru 101 uses one set of constants (36,1e-12 etc) while datasheet rev D equations 9 and 10 uses another. On the other hand, datasheet equations 2 and 3 uses same figures as SLUA535...
    on May 7, 2013

  • Forum Post: UCC2897A non-isolated feedback

    Olli Mannisto
    I'm designing a 24V to 1.8kV bias supply with UCC2897A. I have a flyback configuration but I cannot use optoisolated voltage feedback as the power loss would be prohibitive - Even 1.5mA optoisolator current would mean 2.7W power dissipation and these bias smps' have neglible load and bad efficiency...
    on May 8, 2013

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