AC/DC and Isolated DC/DC Power

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  • Forum Post: Re: Uc3823n PWM Controller

    Fonkwe Edwin
    Hi richard, Thanks for your reply. This is the complete schematic. And a correction here... I used a 4uF bootsrap instead of the 0.01uF shown here. In effect, as you suggested, I tried non-synchronous firing once. I immediately stopped because the rms current being drawn from the DC power supply...
    on Jul 14, 2009

  • Forum Post: Re: Uc3823n PWM Controller

    Fonkwe Edwin
    Hello Richard, I am grateful for your pertinent remarks. 1. I have in effect located R11 and R12 close to the UC3823 2. You got me thinking here... I need to learn how to apply compensation here. Seems a bit complex. Reading about it. Meanwhile, any rapid tips as to how I can easily go about it? 3. D1...
    on Jul 15, 2009

  • Forum Post: Uc3823n PWM Controller

    Fonkwe Edwin
    Hi all, Please I need some help here using the UC3823N PWM controller for a boost converter (with synchronous rectifier). I want to obtain 189Vdc at the output of the converter from a 48Vdc battery. I have attached a schematic of the controller set-up. I would have attached the set-up of the COMPLETE...
    on Jul 7, 2009

  • Forum Post: Re: UCC28070

    Kanwar Abhishek
    Hi, Is there any option or a way exists by which we can make 4 phase interleaved PFC using 2 UCC28070 ICs? or by combining 2 two phse modules. If not possible, can we parallell 2kW modules to make one bigger power.? Actually we are developing a 5KW continuous rating PFC for high power amplifiers...
    on Apr 12, 2010

  • Forum Post: A few question regarding UC2854 PFC

    Hong Yu67765
    We are designing a 220VAC input 10KW power supply. Front end is a 2854 based PFC stage. I put a 75 ohm to it and raises input from 0VAC, the PFC starts to work from 20VAC, boosts to 200VDC or so, at 30VAC it regulates at 400VDC, PF 0.982. However when rise to 35-40VAC it buzzes, PF drops to 0.7 and...
    on Feb 24, 2011

  • Forum Post: UCC28070 current sharing of 3 PFCs

    CWilson
    Hi all, I'm currently designing a 3 phase (4 wire) 230Vin PFC with the UCC28070. I would like to make some currentsharing on the output, and have read on e2e, that the Si85xx should be a fine choice for current measurement of current instead of a current sense inductor. My three PFC's...
    on Aug 5, 2011

  • Forum Post: UCC28019 Voltage Loop

    Flo Zimmer
    Hi, could anybody please tell me, how to get the Transfer Function G_{PWM_PS} (f) on page 38 of the daatasheet http://www.ti.com/lit/ds/symlink/ucc28019.pdf I guess you have to ignore the dynamics of the current loop (because the response is fast enough) and only use one differential...
    on Nov 9, 2011

  • Forum Post: UCC28070 and line frequency

    CWilson
    Hi everybody! I'm soon going to design a 1800W SMPS with the following specs: - Input: Universal mains (85-264VAC) - Output: 400VDC. The converter should have a PF>0.99 at full load but preferably from 50% or even lower. My client is concerned about the input line frequency. Can the UCC28070...
    on Jan 12, 2012

  • Forum Post: UCC28070 in interleaved <<Flyback>> topology - Possible?

    Geir Frode Raanes S���rensen
    I need to power some servo motors, each rated 10 Amps at a nominal 156 VDC. Motor control will ensure that worst case will never be allowed to happen simultaneously, but I still need to come up with a 150 VDC power rail capable of say 15 Amps. That is an awful lot of power to produce in one strike. I...
    on Jan 18, 2012

  • Forum Post: DC/DC Step up from 9V to 200V to drive a vaccum tube

    Andre Araujo
    Hello there everyone, I'm looking for a solution to build a DC/DC step up converter from 9V to 150V or 200V to drive a vaccum tube (12AX7-like), and Io = 200mA. I have already searched the internet but didn't find any similar design. I also tried the webench tool from TI/National. I...
    on Feb 8, 2012

  • Forum Post: RE: ucc28070

    Wu Wei Yi
    Hi,all. We are in process of designing PFC with UCC28070 integrated circuit.Power is 300W, 110V input voltage, 60HZ line frequency,180V Output, 100kHZ switch frequen. I used the application note and excel design tool, The result of input voltage(Vin) , input current(Iin) & load voltage waveforms...
    on Jun 26, 2012

  • Forum Post: RE: ucc28070

    Wu Wei Yi
    HI, the waveforms of Vds(switch voltage) , Ids(switch current) , Id( output of the diode bridge current) and Vgs(gate signal) looks for errors. I hope you may from the waveform to give me some circuit recommendations. Thank you for your help. Regards, Yi
    on Jun 26, 2012

  • Forum Post: RE: ucc28070

    Wu Wei Yi
    Hi, If it happening. How should I check this circuit? Thank you. Yi
    on Jun 27, 2012

  • Forum Post: UCC28220-Q1 Oscillator Operation and Maximum Duty Cycle Questions

    Jerry Chen82343
    Hi, There is a reference design of UCC28220-slvr899. In slvr899, the frequency is printed as 200KHz. However, in my calculation base on Page 10 of UCC28220-Q1 datasheet (equation 7&8 using Rchg=R13=39.2k Rdschg=R11=20k), Fosc should be 344.6KHz. So I want to know what is the actual frequency of...
    on Jul 18, 2012

  • Forum Post: UCC28019 Operation Basics

    Danel October Beriong
    Hello! I am currently designing a PFC circuit using the UCC28019. I havent finished soldering everything into place, but I need to report on some specifics when I get done. These include the switching operation of the IC. I am just wondering which part of the sample circuit governs the ripple voltage...
    on May 29, 2012

  • Forum Post: Testing UCC25706 before implementing it into boost converter

    Jesse Walker1
    Hi everybody I have never used this kind of IC before and have never really fully designed a boost converter ethier. I thought this would be a great learning experience. With the power portion of the converter aside I had a few questions about the UCC25706 chip. Here is a list of parameters for...
    on Aug 1, 2012

  • Forum Post: 3.5KV 1A offline boost?

    Tracy Markham
    Obviously the WebBench won't calculate this. I'm not totally new to power, but this level is a first for me. It would be grand to take either 120 or 220 directly out of the wall and end up with a high / low PS with 3500V & 2500V with either being capable of delivering up to 1A peak, 750 mA...
    on Sep 21, 2012

  • Forum Post: DC-DC LED Driver with solar charge controller

    Amrit Sethia
    Dear All, I need to design a solar Charge controller with LED driver. Input to charge controller will be from Solar Panel of 40W, It will charge the battery. and when it is evening (dawn), Light will be glowing through the charged battery. battery is of 40AH. Output current will be 350mA and output voltage...
    on Oct 29, 2012

  • Forum Post: Problem with UCC28070 IC

    Donovan Davidson
    I have encountered a problem with using the UCC28070 IC in a universal range power factor correction application. The symptom is that the IC turns the PFC regulator stage off repeatedly when the AC input voltage is reduced through about 95VAC at full load. It does not due so when the AC voltage is increased...
    on Nov 2, 2012

  • Forum Post: UCC28070 Hi-line light load current fidelity

    Ian Overholt
    Hello, I am developing an audio power amplifier with a PFC pre-regulator using the UCC28070 with interleaved power sections. Maximum output power of the PFC supply is about 6000W and it delivers that power between 100 and 240VAC. The PFC supply is followed by a resonant DC-DC converter to provide isolation...
    on Nov 29, 2012

  • Forum Post: LM3481 - Boost Converter

    Warren putman
    Currently trying to use a LM3481 on an msop-10 adapter to put it on a protoboard. We are trying to build a 24 to 0.8A 48V boost converter for our design project at school. We got the design off of the TI website webench software.We are using resistors and capacitors found in lab, and have bought the...
    on Jan 30, 2013

  • Forum Post: RE: UCC2806 Soft Start functionnality

    Praveen Desireddy
    I could not find a pspice model for UCC2806 on TI website. Does anybody know how to get it?
    on Feb 25, 2013

  • Forum Post: UCC2806 Pspice model

    Praveen Desireddy
    I could not find a pspice model for UCC2806 on TI website. Does anybody know how to get it?
    on Feb 25, 2013

  • Forum Post: UCC2800 Gain After the Error Amplifier

    PS
    What is the Gain After the Error Amplifier inside UCC2800, in other words what is the ratio between the resistor connected in parallel with the 1V zener and the upper resistor. Is it the same(R, 2R, gain R/3R) as in UCC28C42? I need the info ASAP. Thank you very much.
    on Apr 30, 2013

  • Forum Post: Variable Phase-Shifted Full-Bridge PWM Controller (LM5046/UCC28950)

    David Backus
    Hello, we are looking for a variable Phase-Shifted Full-Bridge Controller (With Synchronous Rectification) to create a variable DC-DC converter. The LM5046 & UCC28950 controllers have the majority of the features except the ability to directly control by a micro (TMS320F28035/ UCD3138 ). Does TI...
    on May 8, 2013

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