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  1. Closed: Re: Transformer spec parameter - what is working voltage?

    Sure. It is in the PDF, or just scroll down and you will find it under "Technical Notes"...
  2. Closed: Re: Transformer spec parameter - what is working voltage?

    The transformer I'm asking about has a 150 VDC working voltage, and so it is rated at 0 frequency. I should have specified the working voltage was DC, and maybe that changes my question for you?
  3. Closed: Transformer spec parameter - what is working voltage?

    Is this the voltage that can exist across a single winding of the transformer, where it would be dependent on the lacquer or winding insulation? This is different than isolation voltage between...
  4. Closed: H-Bridge Design for a piezo ultrasonic transducer

    I would like to understand the flaws to my approach in the schematic.

    In a SPICE simulation, I simplified the ultrasonic transducer with a 2nF capacitor model.
    The USTX Bridge signals will have...
  5. Closed: Re: Which one is harmful for human body high voltage or high current?

    Depends on your method of contact.
  6. Closed: Re: Which one is harmful for human body high voltage or high current?

    Both are lethal! It takes surprisingly little current to be dangerous . . it is a matter of where it is touched on/in the body and where it must travel through. In your examples, it won't matter...
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    Closed: Re: Flyback Lm value in CRM/BCM design

    Oh my, you are right. Sorry for flopping my question so badly!

    This is the part I'm using actually:
    http://www.linear.com/product/LT3798

    I came to a value of 450uH, considering 70 VAC as...
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    Closed: Re: Flyback Lm value in CRM/BCM design

    I am now finding that I should not use the minimum switching frequency of 4khz, but instead choose a switching frequency minimum that will size the inductor for me. But I still think it is correct...
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    Closed: Flyback Lm value in CRM/BCM design

    I would like to use an offline PFC flyback controller that operates in critical/boundary conduction mode.
    http://cds.linear.com/docs/en/datasheet/3748fa.pdf

    I am stuck in trying to figure out...
  10. Closed: PFC with a CCM controller but low power

    My questions are

    1. A CCM operation implies constant current draw. So how can a CCM PFC work when there is no load? What about for very low loads where it forces the inductor to have...
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    Closed: Re: Choke Inductors in SMPS

    So this sounds contradictory to what schmitt trigger commented about chokes (other than the current-compensation thing, which I will take as advice from both of you to not use this particular choke...
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    Closed: Re: Choke Inductors in SMPS

    Thanks for the reply.

    I did not arbitrarily choose my inductance value and specs. I have been using datasheets, app notes, and text references to double check, triple check, etc. that I am...
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    Closed: Choke Inductors in SMPS

    Hello, be prepared for a lot of naive questions.

    I'd like to use a "choke" inductor as my conversion inductor (as opposed to EMI filter) in a boost PFC design. I've never made a boost PFC...
  14. Closed: Re: Can I use a flyback transformer in a forward topology?

    Interesting.

    The reason I ask is of course because I'd like to use an off the shelf transformer for a forward converter. I see that cooper bussman and coiltronics offer these configurable...
  15. Closed: Can I use a flyback transformer in a forward topology?

    This is possibly a stupid question, but is it possible to use a flyback transformer as a forward converter transformer? It seems like a reset winding is an optional method for resetting the core for...
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    Closed: Re: power supply isolation options

    Thanks for the advice. I think that I will be looking at the standard PFC boost stage then.

    - - - Updated - - -

    Ok, I have one more question that I might as well ask in here while its there.
    ...
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    Closed: Re: power supply isolation options

    What about about low power levels, in the range of 30W or less? I found a reference design from ON semiconductor that uses a single stage flyback PFC for laptop adapters. I want to step my line...
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    Closed: power supply isolation options

    Hello,

    I would like to design my first PFC bus power supply, and I am finding it difficult to pick the right topology to work with this approach while still having isolation.

    It seems like most...
  19. Closed: Understanding critical conduction mode converters

    What is critical conduction mode? All of the stuff I find online assumes that the reader already knows about it, and my book Fundamentals of Power Electronics doesn't say anything on it.

    Is this...
  20. Closed: Re: Schematic symbols for solder points and edge connectors

    I understand your point, but for me to have a schematic that is linked to a PCB layout editor, I need to have nets for these connections. I also want anyone reading the schematic to understand what...
  21. Closed: Schematic symbols for solder points and edge connectors

    What would be the standard ref designator and symbol for:

    A) A pad on the board that you just want to solder a wire to
    B) An edge with copper fingers that insert into another board's slot

    If...
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    Closed: Fuse rating part number interpretation

    I know that part markings are a bad way to find the specs for components, but google search is not showing anything for this fuse.

    Its labeled
    "LF.5A/250VP"

    Is this definitely 0.5A fuse...
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    [SOLVED]Closed: Re: Using Capacitor as a power source

    Super capacitors are used in some applications like real time clock power. I once calculated if I could use a super capacitor to drive a phone screen for a few minutes, and it turned out I'd only be...
  24. Closed: Re: Anyone know of an analog version of a sliding correlator/covariance circuit?

    I believe the problem with scaling for my purposes is that one unit might only change by 30ppm/C and the next unit with the same resistor part might change at 50ppm/C. My signal will be dependent on...
  25. Closed: Re: Inverting Amplifier: How to analyze component variation?

    Is this what you would expect to see? This is magnitude of change in gain with frequency and phase of change in gain with frequency with the above equation used.

    I chose a gain of R2/R1 as 0.5...
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