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  1. Closed: Re: Full Bridge DC-DC Converter Operating Frequency

    The answer is 10kHz on switches = 10kHz on all mosfets and Tx primary - according to your firing control mentioned above
  2. Closed: Re: Simple 8 bit uP, 4 A/D in, 4 digital i/o, 8 bit A/D or better, C tools

    thank you - but was hoping for something a little simpler that does not have to have the hardware "assembled" so to speak ...
  3. Closed: Simple 8 bit uP, 4 A/D in, 4 digital i/o, 8 bit A/D or better, C tools

    Hello all,

    Am looking for a simple-ish, small, low cost-ish, but quality 8 bit ( or 16 ) uP for a high volume product

    most of the stats are above, ideally 4 A/D on board or equivalent, ...
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    Closed: Re: Rail to rail circuit simulation

    quiescent dissipation...
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    Closed: Re: Frequency Module IGBT

    in an H bridge, generally each switch switches at the switching freq, in your case each will do 50kHz max, draw it out and you will see ...
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    Closed: Re: Frequency Module IGBT

    either or both IGBT's turn on and off 30,000 times per sec ....

    - - - Updated - - -

    normally for a series totem pole of igbt's one is on when the other is off and vice versa - else you will...
  7. Closed: Re: Opinions about SEPIC versus Zeta converters

    a pk current mode controlled sepic will also reduce the order of the power system - i.e. allow a faster control loop - as will average current mode control ...

    pk current mode control needs...
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    Closed: Re: PWM Ramp Voltage of SG3525

    the ramp signal is approx 0.7 - 3.6V ... a span of 2.9 volts ...
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    Closed: Re: LLC converter design issue

    Simple 2 switch fwd converter would work well here too ..
  10. Closed: Re: High side mosfet driver blows up. help :)

    R19 is very useful if the layout is too open and the centre of the totem pole goes below ground - this is not uncommon and generally blows up a lot of driver chips before the fault is found.
    ...
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    Closed: Re: Vin 18V-32V Vout 24V-what can I use?

    Sepic converter stage run by any boost chip with internal xtor / fet ...
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    Closed: Re: Today I learned something else...

    They operate just off the res freq for the water molecule - for operational food heating reasons ...!
  13. Closed: Re: Localizing acoustic noise source on PCB

    solid plastic tube, acryllic, or hard ABS ...

    - - - Updated - - -

    Also, phone with a freq vs amplitude app display, move the u-phone around - this works really well for > 12kHz - which...
  14. Closed: Re: High side mosfet driver blows up. help :)

    C25 needs 1uF 50V MLCC across it - right by the pins of the GD IC ...
  15. Closed: Re: References on flyback transformer construction

    Prof Cuk is indeed an expert on his own creations - however I once queried him on optimal design for a flyback - and found his ideas "interesting" to say the least - but not connected to real...
  16. Closed: Re: Opinions about SEPIC versus Zeta converters

    another newbie oversight - when the fet turns on there is an enormous current pulse as it shorts out the blocking cap via the diode that shouldn't be there ... and discharges it to zero every...
  17. Closed: Re: Opinions about SEPIC versus Zeta converters

    your ckt is missing a choke - has diode instead ...?
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    Closed: Re: Transformer coupled Class A amplifier

    No - it is just the fact that once the xtor has turned on, i.e. output goes low, you have stored an amount of energy in the xfmr core, now if the xtor is turned off above a certain rate its...
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    Closed: Re: 2n7000 ON resistance

    Neazoi, post a link to the data sheet to make it easier for people to point out the relevant bits for Rds-on at Vgs = 5V & 200mA ...
  20. Closed: Re: High side mosfet driver blows up. help :)

    Sigh, 1uF MLCC pin 8-6, AND ... R2 = 6R8 ...

    AND R3 = 10 ohms,
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    Closed: Re: EP13 transformer core looks open

    it is a closed mag path - just look harder ....
  22. Closed: Re: Opinions about SEPIC versus Zeta converters

    We have built Sepics to 350kHz, choose Sepic when you want low input ripple ( and can have a quality o/p cap )

    Zeta ( or inverse Sepic ) when you need a low o/p cap, and can handle the...
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    Closed: Re: HUM in transmitter PSU

    laptop psu's do make a lot of CM noise ...
  24. Closed: Re: Determining Value of Capacitor Between PV Panel and DC-DC Convertor.

    Hello Brad, um, where do you get the 0.5 amps from ... ?
  25. Closed: Re: Dont need a super accurate, super high bandwidth In Amp...

    LM324 / 358 ( same IC but pair / quad ) would be fine for this ...
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