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: 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: UC3827-1 - Required to keep SRC isolated from GND/PGND?

    Shawn Standfast
    Hello All, I am looking to build a ~1KW offline buck- current fed full-bridge converter using the UC3827-1 controller. The issue is that my input voltage is going to be about 340 Vdc using 120-240 Vac input. Since the UC3827-1 can only sustain up to a maximum of 90Vdc for the floating buck driver...
    on Jul 25, 2011

  • Forum Post: UCC28950

    Sunil K Valsan
    HI, I want to make power supply of the following spec input min 70 V DC Input Max 140V DC Out put 24 DC 10 Amps1. Efficiency above 90% or max possible IS UCC28950 a good choice for the above design. I am not able to optimise the deign as per the design tool UCC28950 Excel Design...
    on Aug 7, 2011

  • Forum Post: Interleaving two UCC28950 with UCC39002 and Si8503

    CWilson
    Hi everybody! We're currently designing a Full Bridge ZVS 3400W converter with two UCC28950 (coupled as master/slave interleaving). For current sensing we're using the Si8503 (recommended by a TI employee in another post). The output of the Si8503 is amplified in order to match the input...
    on Feb 1, 2012

  • Forum Post: UCC25600 variable dead-time

    Laszlo Lorantfy
    Dear fellow engineers, I have come up with an idea about UCC25600. The dead-time should be calculated for maximum input voltage and no load (minimum primary current). When the load increases, input votlage dicreases the switching frequency will decrease so there will be more pimray current, whats charges...
    on Oct 31, 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: LM5046 COMP problem

    Bencsura Akos
    Dear Sir, I have designed an isolated DCDC converter with LM5046. I have connect an opto-coupler between the REF and the COMP pins same like in the Evaluation Boards schematic. The circuit working with maximal duty cycle, no activ and pasiv operation states. When the secunder side voltage reach the desired...
    on Dec 31, 2012

  • Forum Post: SMPS 28VDC@4 amps - UCC3813 and PMP3029

    sanjeev kumar87916
    Hi all, I am looking for a reference design(schematic+BOM) for switch mode power supply(SMPS) with the following specifications and having LOW BOM cost. Input voltage: 230V AC, 50Hz Output voltage: 28V DC @ 4 amps. If anybody can send me the reference schematic and BOM, that will be a great...
    on Mar 26, 2013

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