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Type: Posts; User: treez

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  1. Closed: ACS722 Hall sensor IC...minimum loading for output signal voltage pin?

    Hello... On pg 6 of the ACS722 Hall sensor IC datasheet it says minimal loading for VIOUT pin is 4k7. Does this mean we need to load it with at least 4k7?
    (sorry I did search this subject topic in...
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    Closed: Re: Half Bridge LLC Transformer

    looks good...but you need to put your values into the attached ltspice schem and run it and check for the zvs etc

    - - - Updated - - -

    remembering to change the frequency to suit...and a decent...
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    Closed: Re: Half Bridge LLC Transformer

    With the LLC, you should choose a magnetising inductance value as high as possible in order to reduce circulating current….however, there must be enough magnetising current to allow the VDS’s to...
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    Closed: Re: Half Bridge LLC Transformer

    In this course there are folders on LLC for you if you want…..
    https://drive.google.com/open?id=0B7aRNbu3Fes4TU92Mkw3YlA3ams

    Basically, you must produce a Vout vs frequency graph……..if you...
  5. Closed: Re: Off-the shelf transformer for push pull converter

    Yes..the 1:1 core you showed me in post #18 above cannot do 5vout from 5vin in pushpull connection...neither with currnt doubler connection, nor split coil output.
    The attached ltspice , which is...
  6. Closed: Re: Off-the shelf transformer for push pull converter

    your spec is 5vin 5vout 5wout 250khz.
    That transformer is 1:1.......so you wont be able to get 5vout from 5vin with a pushpull with split secondary coil......because this would need more than max...
  7. Closed: Re: Off-the shelf transformer for push pull converter

    Whats your likely best one.?..(part num?)....tell it here and ill design it through for you and post it.

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    i think Kashcke (kaschke? kashke?) do OTS txfmrs aswell
  8. Closed: Re: Off-the shelf transformer for push pull converter

    ok in that case its even easier for you...pick a core, taking a general note of its size, cross sectional area, in relation to your power , and go through the PP design with it....find your Bmax...
  9. Closed: Re: Off-the shelf transformer for push pull converter

    Theres no “equation” that you can use to tell if any given transformer core set is ok for your particular application.
    Things like “has it got a bobbin with enough pins on it” , also come into...
  10. Closed: Re: 12kW power supply spec with vin = 1000v to 880v?

    Thanks...Woops yes, I forgot to include an error amplifier which would kick in if Vin to any converter fell to 250V, and it would start pegging back its output as the vin fell to 250V and lower….so...
  11. Closed: 12kW power supply spec with vin = 1000v to 880v?

    Hi
    A way of doing this Power supply spec?…..

    Vin = 1000v to 880v (source is 1000V but cable resistance between source and Power supply is 7.5 Ohms so actual vin drops with load)
    Vout = 48V...
  12. Closed: Re: Off-the shelf transformer for push pull converter

    here is a push pull thread with some advice on transformer
    https://www.edaboard.com/showthread.php?389180-Push-Pull-Converter-transformer-design-for-120-watt-power

    You have to make sure it wont...
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    Closed: Re: LDO & BUck Converter

    here is a SMPS power module that can do the job for you....

    https://recom-power.com/pdf/Eval-Boards/RPM-1.0-EVM-1.pdf

    buck is maybe no good as the battery will drop to 3.3v maybe and then you...
  14. Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

    Thanks, yes, the sole reason for isolation is that it “breaks” the current loops in which high frequency noise currents can be induced in to….these currents can possibly afflict the power modules...
  15. Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

    Please find block diagrams of two 3.7kW power supplies. One is isolated. One is not. They are otherwise the same.
    Which one is more likely to suffer from noise issues which may stop the power...
  16. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    ...the top video of #7 above shows why pink bags would be useless for carrying PCBs whilst walking on a non esd safe carpet
  17. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    Thanks. ill look into static shielding tubs because static shielding bags are pricey, and to test if they are genuine you need a $460 surface dc voltmeter, and a $3 ignitor, as in top video of kindly...
  18. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    Thanks, i see that if i were to carry a populated PCB across a non ESD safe carpet, then the pink bag ("anti-static)" would be of little use, but just very very slightly better than me holding the...
  19. Closed: Resistance of component bag made of "reddish" ESD plastic?

    Hi
    Due to lack of funds we are doing electronics in an office with a carpet which is not ESD safe.
    Often we need to carry a PCB with ICs etc on it….walking across the carpet as we do so.
    The...
  20. Closed: Re: Non isolated SMPS does not need Y capacitors?

    Hi,
    Regarding an SMPS with just a two wire feed (go and return), it is a fact that generally a non-isolated design will give a lesser common mode noise problem than an isolated design.
    Why is this...
  21. Closed: Re: Non isolated SMPS does not need Y capacitors?

    Thanks, ..it would be too heavy to have an extra earth wire in the tether, along with the go and return wires.
  22. Closed: Re: Transient testing rig for 3720W power supply with DCDC modules.

    Thanks, though they wish to do it with a high side fet, more on this later.

    Do you agree that the switched FETs must have gate_source resistors for ESD and Damping reasons?...
    Our contractor...
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    As Easy Peasy says you may well have blown the fet...and with a mains circuit and a blown fet...you may have blown the uc3845 too...a blown fet often goes short drain to gate...so your uc38xx may...
  24. Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

    This “noisy output current feature”….is possibly not a bad thing….the module still supplies the load perfectly well with max/off transients served very well.
    Also, I have just put 12mF of C(out)...
  25. Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

    ..I must admit this noise in the output current is the most unthreatening noise i have ever seen...it doesn't get any worse no matter how much extra c(out) is added.....it is always bounded to +8%...
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