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  1. Replies
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    Closed: Re: PWM Ramp Voltage of SG3525

    Hi,


    Seems app notes for 3525 are for the monolithic or paleolithic IC, or whatever term is more appropriate, SG1524.

    ST, ST-AN250 (cd00003778) - 'A Second-Generation IC Switch Mode Controller...
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    691

    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,

    I'm focussing on SEPIC as it fitted requirements and to be capricious, I like its handy functionality (Vout = <>Vin) which is useful for PV cells and batteries (e.g. 3V to 3.7Vin for 3.2Vout...
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    Closed: Re: PWM Ramp Voltage of SG3525

    Hi,

    I wouldn't like to say anything misleading... It might mean that the error amplifier output voltage can go from 0.7V up to 3.6V, so the sawtooth would need to be sized in amplitude to fit that...
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    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,

    Thanks. Some very interesting information in your post, treez, much appreciated.
  5. Replies
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    Closed: Re: PWM Ramp Voltage of SG3525

    Hi,

    You don't mean the section called 'PWM Comparator' in the datasheet electrical specifications, do you? The bit that says input threshold zero duty cycle and maximum duty cycle which is 0.7 to...
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    Closed: Re: Localizing acoustic noise source on PCB

    Hi,

    Don't want to waste your time, obviously... Would a contact microphone, the way a stethoscope is used, placed on each inductor one by one help to locate the clicking one? It might show a...
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    Closed: Re: Current Density PCB track

    Hi,

    Nice cheatsheet table for lower currents:

    Relationship between Copper Weight, Trace Width and Current Carrying Capacity

    This one is better, I think:

    PCB TRACE POWER HANDLING CALCULATOR
  8. Closed: Re: Guitar effects circuit and noise from timing I.C's

    Hi,

    I suppose a band-stop/reject filter wouldn't help, if the tick is periodic, or the whole circuit wouldn't work any more?

    - - - Updated - - -

    Hi,

    I don't think this is completely...
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    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,

    Thanks, that's very kind of you. I use the TI Tina free version schematic capture and simulation tool and it seems pretty good, it does all the things you mentioned in your last post.

    I...
  10. Replies
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    Closed: Re: Question about RL RC natural response

    Hi,

    Look at RC charging and discharging constants and voltage and current behaviour when C charges and discharges; and quick review of series/parallel circuit information, current is shared...
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    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi Akanimo,

    Not sure what you mean by switching and averaging. Component values are all in schematic, awol L2 is also 100uH. It was just messing around, as two people have pointed out contras to...
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    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,



    Great, thanks, really important. I had a voltmeter on that node, no ammeter, so didn't see that.
  13. Closed: Re: Opinions about plagiarized paper on an academic website

    Hi,

    Thanks, interesting read. 'Guest authorship' is a new concept for me... These type of things must be so common everywhere.
  14. Replies
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    691

    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,



    Good, isn't it? :lol: It's a ZEPIC converter :laugh:

    Last lengthy paragraph of previous post explains. Proper circuit has L1 and L2 but that schematic has several 'post-it note' style...
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    Closed: Re: LLC converter design issue

    Hi,

    Some app notes make me mad (kidding, mostly) - the ones that provide formulas or require factors with no explanation so you spend another week looking for one term in the formula so as to...
  16. Replies
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    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,

    The damping on Cc is something I've never heard of, thanks.

    Really good to know that input and output pulsed current is not so bad. Had visions of cell/battery heating up and exploding.
    ...
  17. Closed: Re: LDO load transient response in the event of a sudden load change

    Hi,

    Don't know, could be more than one reason, and no idea regarding W/L characteristics.

    If it operates in the same way as a discrete EA - in the feedback loop, C and R in series from fb input...
  18. Closed: Re: Opinions about plagiarized paper on an academic website

    Hi Brad,

    Yes, I think that's a concern for anyone doing research or leisure reading of any kind these days.
  19. Replies
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    Closed: Re: circuit with drive buffer

    Hi,

    Unlikely - is it anything to do with source impedance/resistance so Vin at input pin is lower than what you think it should be?
  20. Closed: Re: Opinions about plagiarized paper on an academic website

    Hi,

    Thanks for input. Lots to discuss in replies...

    Important is that it is not on IEEE, it is a website that serves a similar purpose - it is a repository of academic and other papers and a...
  21. Closed: Opinions about plagiarized paper on an academic website

    Hi,

    I have a quandary: I mind my own business in life in general, however, yesterday I read AN-1075 (dated 2008) by Matthew Kessler at Analog Devices which starts with detailed description of Zeta...
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    Closed: Re: Offset / Gain interaction

    Hi,

    Could you make use of the +-12V dual supply and another op amp to cancel the offset and so not disturb the gain adjustment part?
  23. Closed: Re: Doing electronics on an office carpet (non ESD)

    Hi treez,

    You make a good point about permanent use and sporadic use related to esd failure.

    To be honest, only you can know whether to - and for which reasons/experiences - desist from a...
  24. Closed: Re: Doing electronics on an office carpet (non ESD)

    Hi,

    While not making 12kW converters, and fwiw but so you have a comparison, when in UK in two different houses with carpeted floors, and a cat, and wearing man-made fibre static-producing...
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    Closed: Re: 2n7000 ON resistance

    Hi,

    I think Klaus was being fair/honest, not rude. MOSFET datasheets are slippery characters, I find them pretty hard to understand. MOSFETs Vds falls when they are turned on, like BJT Vce (sat). ...
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