AC/DC and Isolated DC/DC Power

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AC/DC and Isolated DC/DC Power

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PWM Controller
Related Posts

  • Forum Post: Re: UC3823 PWM Controller

    dragan svalina
    There are small millions way to generate PWM but you choose harder way. I like that. You can use "Open loop test circuit" like start-schematic .Recalculate Rt and Ct to make desire frequency .Pin #9 pull-down. Pin#1 leave on referent level (about 2.5V). Resistors 27k replace with 4.7k in voltage...
    on Jan 15, 2011

  • Forum Post: UCC28950 open-loop operation?

    Romero Andersen
    We are developing a high-efficient dc-dc converter based on UCC28950 (Green Phase-Shifted Full-Bridge Controller With Synchronous Rectification). We are facing difficulties when trying to operate UCC28950 in open-loop configuration. We would like to set a fixed duty cycle without feedback for testing...
    on Mar 3, 2011

  • Forum Post: need help in ucc28600

    ramanathan muthusamy
    hi all, i use ucc28600 ic design calculation (slvc104) to design flyback switching power supply. in this design, the value of resistance value and all xformer ratio values all cames in negative value. is it right?
    on Apr 5, 2011

  • Forum Post: uc3856 slope compensation

    geert de vries
    HI, I am working on a push pull converter wich should operate from a 48V dc bus. I intend to use UC3856 currentmode pwm or similar. There is an absolute need for external syncronisation, which can be accomplished by grounding the CS pin and applying external sync signal. But how do I implement...
    on May 16, 2011

  • Forum Post: UCC28089 Modified Square Wave Inverter Application

    andrew judy
    Hi, I have built the circuit on page 11 of the UCC28089 PWM controller data sheet. It appears to be switching but there isn't any AC output. When I remove CT there is some very unstable output. It is suppose to output 110VAC at 60Hz. Has anyone else built this circuit? Does any one see what could...
    on Jun 20, 2011

  • Forum Post: Modifcation of input voltage and output power of UCC28950-EVM442

    Min Sik Rho
    Dear E2E community; I am very intrested in ucc28950-EVM. My project is 4 or 6 parallel operation of dc-dc converter for making a few kilowatts output. For this, I will use user manual and EXCEL simulator of ucc28950 but I have some questions. 1. First, I want to make 4-parallel operation...
    on Aug 25, 2011

  • Forum Post: SYNC pin of UCC28950

    Min Sik Rho
    Dear; I'd like to make parallel operation more than two DC-DC converter. I will use 28950 for this work. Can anybody explain the function of SYNC pin of UCC28950 ? How many conveter can be sycronized? Regards. Rho.
    on Aug 29, 2011

  • Forum Post: Re: Modifcation of input voltage and output power of UCC28950-EVM442

    Min Sik Rho
    Dear Hong Huang; Thank you for kind explaination. What do you think of sincronized parallel operation(sincronized switching) of 28950EVM not interleaving method? What is most significant disadvantage of this paralell operation compared to interleaving ? I konw output harmonics of sincronized...
    on Sep 6, 2011

  • 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: UCC28950 current sensing

    SteveW
    Hi I am looking at designing a converter based on the 28950, and hopefully migrate to a DSP, but I have a question about the current sensing. I have been using the excel design tool (sluc222b) which is making life a lot easier, but I have a problem with a large primary current, the application...
    on Feb 28, 2012

  • Forum Post: problem in SG3524D (SMD) component

    Raja Saha
    we are using SG3524D (SMD) compeonent the PWM voltage mode controller. At everty input pin all the signals are fine , even RT/CT is also coming properly. But the output pin ( 12 & 13 ) is coming wrongly. Feedback signal is 1.5V and reference voltage is 0, output is supposed to be +15V, but it...
    on May 22, 2012

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