AC/DC and Isolated DC/DC Power

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PFC
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  • Forum Post: UCC28070 Implement Bridgeless Power Factor Correction (PFC)

    Antonio Jesus Garcia
    Hello, we are developing a PWM rectifier following the application note SLU517. I have some questions. - Can I use IGBT instead of MOSFTET? -If we connect the pin7 to VREF to disable current synthesis What happens? Should we make some change in the design? -Where can we find the current sense...
    on Jul 1, 2010

  • Forum Post: Inquiry for 250W Buck PFC

    Brian Wang0928
    Hi, There is a PFC inquiry for aviation application. Could you kindly give a suggestion what PFC device is suitable for this? Very thanks. SPEC: Vin: 90~150 Vac Vout: 28 Vdc Iout: 8.9Amp Watt:250W Line Frequency (Vin): 62Hz~800Hz Brian.
    on Nov 1, 2010

  • Forum Post: UC2852

    Masazumi Ishii
    Hello I　use　UC2852 for PFC device I am experimenting with the circuit of the attached paper. When this circuit is moved, abnormality is found in operation. 1 Look at pictuer　波形2　（the attached paper. ) 　usually.This shape of waves becomes off about the switch and becomes a switch on ..the next....
    on Nov 16, 2010

  • Forum Post: Re: UCC28061 interleaved PFC for just 50W also?

    gabriel suciu
    I do not think at 50W you need PFC. A flyback or simple foward converter will be enough.
    on Feb 19, 2011

  • Forum Post: Re: UCC28070

    gabriel suciu
    You can use an external quad or dual phase signal generated by a simple logic family counter. The generated frequency has to be some 10-15% higher then the PFC-IC circuit. At 5kW I also would use a quad phase boost circuit for the input filter easier design.
    on Feb 19, 2011

  • 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: Files for Quickstart Motor Control and PFC Developer’s Kit

    Philipp Werland
    I need the file "Lighting_DCDC.exe" to check the Board (Motor Control and PFC Developer’s Kit). The file should be on an USB stick shiped with the board, but there is no USB stick with my Kit. Where can i find the file. Thank you for your help.
    on Mar 18, 2011

  • Forum Post: One stage PFC flyback using the UCC3817

    Pablo Rodriguez
    Hi, I have the following problem: When the converter starts switching, there are spikes that are induced in the auxiliar winding that supplies the IC (Vcc pin ). These spikes go beyond the boundaries of the UVLO (16V and 10V). It means that the IC is turned off an then is turned on. The ringing frequency...
    on May 19, 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: UCC28019A and UC2853A

    Hiroshi Sato
    I think UC2853A can use lower value Rsense and it has lower power loss compare to UCC28019A. But, about the cost of IC, UCC28019A is lower than UC2853A. If possible, please let me know the usage of UCC28019A with lower value Rsense. (In UCC28019A, the lower value Rsense will cause damage to...
    on Oct 18, 2011

  • Forum Post: UCC28070 variable output voltage

    Chris Walters
    I'm designing a PFC controller. I choose it because I'll need ~3.5kw output power and it supports running multiple controllers synchronized. I need my output voltage to be adjustable between 250-350volts, (120vac input). At first, I figured I could just adjust the feedback voltage divider to...
    on Nov 2, 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: UCC38050/51

    eli
    Can the UCC38051,be used with UVLO=11.5v? One of our customers using TDA4862,as he has Voltage supply of 12V+-0.5V b.regards Eli
    on Nov 12, 2011

  • Forum Post: UCC28063

    Laszlo Lorantfy
    Hello, I would like to design a PFC with UCC28063 (similar to UCC28060, UCC28061). I intend it to work only on high line (so 200-250V AC input). When I do the calculations with the Excel spreadsheet, I got a lower than reccomended (66kOhm) value for RT timing resistior. If I get it right, chosing a low...
    on Dec 7, 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: PFC syncing with downstream dc converter

    Harrison 2011
    Hello, Anybody know where I can find information regarding PFC syncing with downstream dc converter? TI says they have it in PFC and motor control kits but I could not find it. I don't know where I should post this question, so please forgive me if it is in the wrong place and please...
    on Jan 13, 2012

  • Forum Post: Re: UCC25600 Based 3KW LLC DC-DC converter

    CWilson
    I've used the UCC25600 up to 550W (designed to 800W). The LLC is great below 1kW but has the disadvantages as described above IF you're regulating the output. I designed mine as a chopper at the resonance frequency (unregulated), which gave me around 97% efficiency at 520W (for LLC alone). ...
    on Feb 3, 2012

  • Forum Post: Re: 800W resonant converter using UCC25600

    CWilson
    I've designed a LLC with almost the same specs ;-) Power: 800W output Non-isolated: 85-264VAC (PFC UC28061) to 400VDC. Isolated: 400VDC to +/- 82VDC (165VDC from + to -) (LLC). Unregulated! fsw = 100kHz. I managed to get 510W out due to the lack of load resistors. I got around 97% efficiency for...
    on Feb 7, 2012

  • Forum Post: PFC on a split rail DC output

    Steven Howell
    Hi everyone, Im currently looking at providing PFC for a split rail +200/-200 power supply (maybe higher). Neutral is my common, and the +/- component of active(hot) is rectified to each of the required split rails. My output will not be isolated. Can I use a single PFC controller in such an application...
    on Mar 16, 2012

  • Forum Post: UCC28070 restarting

    Michal Sitta1
    Dear All, I am trying to build PFC with UCC28070, I have only first version of PCB and I already know that my layout isnt good enough and need to be rerouted. But even with this i should be capable to findout where is problem with my design. According to my scope measurement it seems that IC is periodicly...
    on Jul 11, 2012

  • Forum Post: UCC28019 and UCC28019A

    John2012
    Hello, What are the differences between UCC28019 and UCC28019A? After half hour reading the datasheest, I couldn't tell, thought to ask a quick question as I'd like to buy it today. anybody can help? Thank you,
    on Apr 29, 2013

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