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buck converter
Related Posts

  • Forum Post: stablizing battery charger without load

    David Knight
    I used LM25088 buck controller to create a lead acid battery charger. Since the product is a battery charger, I don't put much capacitance on output of buck converter, since battery is large capacitive load. The output capacitance is 6 pieces of 1206 1u x7r capacitors in parallel. The inductor is...
    on Apr 19, 2012

  • Forum Post: more lm22680.....

    geert de vries
    related to the lm22680 topic which i posted one hour ago, some more info: A lot of the lm22680 we have mounted on the boards are very temperature sensitive, others not. Heating up to 50-60 degr. celsius using a hairdryer causes these sensitive LM22680 to shut down, while they do not dissipate or...
    on May 30, 2012

  • Forum Post: RE: lm22680

    geert de vries
    Thanks for the answer including the interesting documentation. I noticed that the self-sync circuit differs from the circuit in the LM22680 datasheet, although the chips seem to be compatible otherwise. Besides that, we did some more testing and two strange things keep bothering us. 1 The free running...
    on Jun 1, 2012

  • Forum Post: RE: lm22680

    geert de vries
    Hi Frank, I inserted the schematic and the datasheet of inductor and output cap. Also the screenshots from the output nodes. I hope these are all attached, because I can not see any indication of attached files at this moment... The upper trace of the pictures is the 3v3 regulator, the lower...
    on Jun 4, 2012

  • Forum Post: LM22680 Buck converter output voltage dip.

    Owen Olivier
    Hey guys, I have a little situation. I'm using the LM22680 and constructed a buck converter circuit using the guidance of webbench. The circuit forms part of a power supply used to power a HF radio. All works well, except when the radio boots, upon which the 5 V output takes a slight dip. Under normal...
    on Jun 19, 2012

  • Forum Post: RE: lm22680

    geert de vries
    The layout is duplicated for 3v3 and 1.3V. It is implemented on a 4 layer FR4 board, no components on the rear of the board. Both converters have a separate groundplane anex heatsink on the bottom side of the pcb, a central ground is connected to the inner layer groundplane at the - pad of the output...
    on Jun 20, 2012

  • Forum Post: lm22680

    geert de vries
    On a board I have 2 LM22680 switchers in use: one for generating 3.3V from a 5V source, the other one regulates down to 1.27V from the same 5V source. I have some problems synchronizing the converters. When connected in self sync mode, the 1.2V converter shuts down after a while when temp is rising...
    on May 30, 2012

  • Forum Post: Ringing on Vin of LM2674 and RC snubber

    Eric Sarmiento
    I have inherent ringing on the input and output of the LM2674 switching regulator. The design flaw is in the traces being used to connect the regulator. However since our customer doesn't want us to respin the boards, we're being forced to look at other solutions. I came across using a RC snubber...
    on Jun 21, 2012

  • Forum Post: LM3150 Design Problem

    Rick Barnich
    Used Webench for 3.3V 3A supply design(Design: 1125765/393 LM3150MHE) Output is 6.2V not 3.3 and system oscillates when load is applied. Components are exact part numbers in design. Cin is 2 x 4.7uf, not 1 x 4.7uF. Look at design. Any ideas? Thanks in advance, Rick Barnich
    on Jun 26, 2012

  • Forum Post: RE: LM5010A - No Webench Design possible

    selim dumlu
    Hello Dear Would you help me for purchasing 10 to 20 pieces LM5116WG s. I found two companies in internet ,Mouser and Elcodis ,but they dont supply for that pieces only for masses.I would be pleased if anyone inform me about a company which can supply me for that quantities Kind Regards Selim Dumlu
    on Sep 27, 2012

  • Forum Post: charge pump circuit with lm2676 to get negative supply

    rahil ahamed
    Is there any possible to add charge pump circuit with lm 2676 to get negative supply.i am generating +3.3v/0.5A from lm2676 now my circuit require negative supply -3.3v/10mA can i get from same ic. plz help me as soon as possible. Regards, Rahil.
    on Mar 29, 2013

  • Forum Post: Help With Pd, Thetas & Thermal Calcs: LMZ12008

    Eric Page
    Design Parameters: Vin: 14V DC / Vout: 5.2V DC / Iout: 4.2A / Ta: 50degC / Max Tj: 100degC / 2-layer PCB Interpolating between Vin of 12V and 16V, and between Ta of 25degC and 85degC on the LMZ12008 data sheet , I get efficiency of ~90% and Pd of ~2.4W. Plugging Pd into formula 13 on page 18, I get...
    on Apr 21, 2013

  • Forum Post: RE: LM2576-ADJ GETTING HEATED(NO USE OF HEAT SINK)

    Viral Vasa
    Hi Anston, As i have reffered the power dissipation of drawing in datasheet, the dissipation is about 1W & noramal ambient temp for my load. i think the switching topology fails & IC does not work as switcher. May i know the reason that why @0.8 A Load it's juction temprature becomes more...
    on Apr 25, 2013

  • Forum Post: LM2576-ADJ GETTING HEATED(NO USE OF HEAT SINK)

    Viral Vasa
    Hi all, I have used LM2576-adj as voltage regulator, Input voltage-24V & O/P voltage- 12V, input & output capacitance are 220uF/50V & 1000uF/25V. The Load @ output is about 1.8A. The inductor @o/p is 220uH with proper interfacing of Schotky diode. --The Problem is LM2576 gets heated very...
    on Apr 23, 2013

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