AC/DC and Isolated DC/DC Power

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UCC28950
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  • Forum Post: Full Bridge Transformer - should core be gapped?

    Peter Baxter
    Does the transformer for the magnetics on a Full-Bridge controller (UCC28950) require a gap? In Keith Billing's book (Switchmode Power Supply Handbook), he gives reasons why there shouldn't be a gap, but then recommends against adding a series capacitor to block the DC. Thanks Peter
    on Feb 19, 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: Cause of UCC28950 Failure?

    Anandkumar Elumalai
    Hi, We are trying to see gate pulse without connecting MOSFET's with externally applied +12V. The current consumed by IC is around 80mA and the voltage measured at VREF is 7V How could we check the gate pulse before we connect the MOSFETs? regards, Anand
    on Apr 7, 2011

  • Forum Post: UCC28950 EVM board efficiency improved

    Roger Ding
    we have a important custom in china, they need evaluate efficiency of UCC28950EVM, and we hope to improve efficiency in half load of UCC28950 EVM board from 95.5% to 96.5%, custom want to use UCC28950 in sever power ,and need acquire platinum efficiency. it is requirement (DC-DC) of custom indetail...
    on Jul 19, 2011

  • Forum Post: Question about the UCC28950 phase compensation fomula

    Go
    Hi, I'd like ask about the UCC28950 phase compensation fomula in app note SLUA560C page17 fomula(105). In this fomula, It seems that no consideration about Inductor(Lout) can be found. Usually, there is a element of inductor(Lout) in the transfer function, I think. Is this fomula correct...
    on Aug 11, 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: Full Bridge Phase Shift ZVS Converter

    John Bottrill
    KK, There is no "demagnetizing current". Assume that the current through the Lmag is as shown in blue at the end of the A/D power stroke and that it will remain in the configuration as shown until the transition to the C/B power stroke. Then it will transition to the other direction during...
    on Sep 2, 2011

  • Forum Post: Re: SYNC pin of UCC28950

    Min Sik Rho
    Dear hong huang; Thank you for kind expaination. I want to make a DC-DC convter with power more than 10 kilowatts. Ucc39002 can be applicated with ucc38950? What do you think how many ucc28950 can be paralleled with interleaving method? Is it depends on interleaving frequency? If not use...
    on Sep 4, 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: UCC28950 Current Doubler Synchronous Retification.

    Nilton Araujo
    Hi, I would like to known if the pins OUTE and OUTF of the UCC28950 can drive MOSFET's in Current Doubler configuration. Best Regards, César.
    on Nov 17, 2011

  • Forum Post: Re: UCC28950 Current Doubler Synchronous Retification.

    Nilton Araujo
    Hi Dragan, Thank you for your help. Best Regards, Cesar.
    on Nov 18, 2011

  • 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: Re: DC DC Converter Uin= 300V, Uout=110V, Iout= 150A

    John Bottrill
    Lumi, AT the power levels you are planning to operate at i would suggest a phase shifted full bridge topology using a UCC28950 controller. Regards, John
    on Apr 9, 2012

  • Forum Post: UCC28950 LOW EFFICIENCY POST 2

    John Wiemeyer
    Hi Mike, The engineer at Cobham implemented the changes in the list I gave you. The regulator is operating in continuous mode now, but not within regulation. Also, the design needs Vout at 1.15V. The spread sheet that was provided does not go down to 1.15V. Can you provide one that does? We need some...
    on May 26, 2012

  • Forum Post: UCC28950

    Go
    Hi, I'd like to ask about the purpose of those components(D4,D6,C1,R6,R8,R9, on secondary side) in UCC28950EVM schematic. (Maybe I think those components are for absorbing the surge of secondary MOSFET drain voltage...) http://www.tij.co.jp/jp/lit/ug/sluu421a/sluu421a.pdf and I'd also...
    on Jun 26, 2012

  • Forum Post: UCC28950 / Control from primary side without synchronous rectification

    S.Satoshi
    Hi, Our customer want to use UCC28950 with controlled from primary side. And also they do not need synchronous rectification on secondary side. Then that configuration will be the same with the typical application circuit of UCC3895. Can you recommend that UCC28950 will be used with this configuration...
    on Nov 6, 2012

  • Forum Post: UCC28950 spreadsheet possible issue

    Jeferson Staudt1
    Hello there. I'm designing a DC/DC converter using the UCC28950. The specifications os the power supply are: Vin = 390Vdc (PFC) Vout = 48V Iout = 21A I was using the the spreadsheet avaliable in the following link: http://www.ti.com/litv/zip/sluc222b But, I believe it has a little issue....
    on Dec 3, 2012

  • Forum Post: How to use UCC28950 as an inverter controller

    semih kavurucu
    Hello, i want to design an inverter with 25 to 50V DC input and 250Vrms pure sinewave output with flyback topology with unfolding bridge . The output of flyback should be rectified sinewave. Can i use UCC28950 or maybe UCC2895 to generate rectified sinewave with 100Hz or are they only for DC/DC conversion...
    on Dec 4, 2012

  • Forum Post: ucc28950 thermal problem

    Hose Fernandes ARMANDO
    Hi everybody; I'm at the beggining of phase shifted and I only gave 15V to 23'th pin of ucc28950 and a GND to 24'th pin. But the tempreture of IC goes up and when I measure Vref pin I see 6.7 V instead of 5 V. Does it need any connection to see 5V or something wrong?
    on Dec 25, 2012

  • Forum Post: RE: strange H-bridge driver signal for UCC28950

    Michal Sitta1
    Dear Flavio, Thank you for your answer. Gate resistor is now 10 R (almost no change versus 3R9). I did few more tests and there are some outputs. I have new electronic load (Chroma 6314A +300 W output module 80V/60A) so I have more easier testing. With input voltage 150 V and output 2 V/...
    on Jan 8, 2013

  • Forum Post: RE: UCC28950 / abnormal pulse skipping

    S.Satoshi
    Hi John-san, Thank you for your response. I appreciate if I can have your further comment. Best Regards, Sonoki
    on Jan 14, 2013

  • Forum Post: RE: UCC28950 / abnormal pulse skipping

    John Bottrill
    Hi Sonoki-san, Since the failure is intermittent in nature I would suggest that you look at each of the pins looking for noise issues. Does the voltage on any of the pins go below ground by more than 0.3 volts. If so that can be turning on internal parasitic devices. Can you capture the waveforms...
    on Jan 14, 2013

  • Forum Post: RE: UCC28950 / abnormal pulse skipping

    S.Satoshi
    Hi John-san, Sorry for delayed response. I'm requesting customer to check the voltage on COMP pin but they can not have a time to check it so far. So can you assume why this pulse skipping issue is happened and it is improved by changed the RTMIN resistor from 47kohm to 13kohm? Best Regards...
    on Jan 17, 2013

  • Forum Post: RE: UCC28950 / abnormal pulse skipping

    S.Satoshi
    Hi John-san, Sorry for my delayed response. I'm requesting customer the information you requested right now. Please wait for my update. Best Regards, Sonoki
    on Jan 21, 2013
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