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  1. Closed: Re: Best isolated or differential scopes/probes

    Thanks. So do you have a preferred differential probe or is your impression that they're all similar?

    There is an EEVBlog video discussing the design of the cleverscope and showing it off in a...
  2. Closed: Best isolated or differential scopes/probes

    Like others I'm sure, we constantly run into the limitations of our differential probes when looking at high CM slew signals like high voltage high side gate drive.

    What equipment do other...
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    Closed: Re: Feedback less PushPull Converter

    You should be able to run the forward converter 'open loop' with no feedback. Many switching supplies operate this way. But you'll get 0 line regulation and poor load regulation. Maybe this is ok...
  4. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    Of course interleaving works in simulation.

    In practice I've concluded 'open loop' interleaving is possible if the gate drive duty cycles are reliably matched and care is taken to match layout...
  5. Closed: Re: Voltage input to BLDC inverters on tethered drone?

    I had some discussions with a tethered drone company and they were pushing about 1000V 1-2A DC up the cable. Resonant converters on each end.

    Drones are pretty high volume business now so it...
  6. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    My first thought is that this large a ratio warrants a transformer but I wonder if modern SiC devises make the buck idea more feasible. I'd study a 1-stage implementation and see if its possible. ...
  7. Closed: Re: Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB

    I was implying that the added open loop gain in the 1-100hz range would result in lower closed loop error. Looking at these closed loop simulation that's not true however due to the early onset of...
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    Closed: Re: Scraping PCB causes ESD damage to IC?

    Heated buildings are often extremely dry in winter. Wearing a sweater around the carpeted office sitting in a rolling chair causes a lot of static.
  9. Closed: Re: Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB

    Can I ask what the application is? I’ve experimented with this compensation scheme but have only recently found other examples of it in custom audio opamps.

    I speculate that putting a limit on...
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    [SOLVED]Closed: Re: Transformer saturation & ACM control

    I'm not sure I understand the whole picture but generally the modulator of a full bridge should be inherently balanced. Residual DC offset voltage in the switching waveform will be minimal. Average...
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    Closed: Re: Discrete transistor voltage regulator

    I'd suggest a 1.24V TL431 variant as a replacement for Q1 (with D1 removed). A TL431 can be thought of like a transistor with a very accurate threshold voltage.

    If you want to go lower than 1.2V...
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    Closed: Re: Discrete transistor voltage regulator

    Yes that's it. R1 turns on Q2 which turns on Q3 which which charges C2 and the load until Vout is high enough that Q1 starts turning on and prevents Vout from rising any higher (by turning off Q2). ...
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    Closed: Re: Discrete transistor voltage regulator

    Regulation works like this: If output voltage is high enough it turns on Q1. Turning on Q1 pulls down on the base of Q2 which turns it off to reduce current to the load (thus voltage). If output...
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    Closed: Re: Regarding synthesis of HDLs

    Understanding synthesis and understanding the language are two different things. To understand synthesis you want to understand digital logic, how digital logic works and what's possible.


    Think...
  15. Closed: Re: ADS62P49- 14 bit ADC Output Mismatch for LVDS and LVCMOS

    You may not be understanding 2s compliment.

    11111111111100 in 2's compliment is -4. A small and reasonable DC offset.
  16. Closed: Re: Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB

    Is this a fixed frequency inverter (50 or 60hz for example)? If so PR (Proportional Resonant) control is another good option.

    PR control adds a tuned resonant element to the feedback that works...
  17. Closed: Re: Recommend a pulse filter? If pulse longer than 100ms, output, otherwise not

    Timerblox are generally good for these applications. Specifically perhaps the LTC6994

    https://www.analog.com/media/en/technical-documentation/data-sheets/LTC6994-1-6994-2.pdf
  18. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    I also don't see the BJT helping. It's a follower topology so the output becomes [opamp out] - Vbe. It doesn't reduce the loop gain in any helpful way but insteads add more delay/poles.

    I don't...
  19. Closed: Re: LT1681 Forward controller in offline use? (low current sense threshold of 150mV)

    Well nothing is a black and white in this world. The question comes down to how much effort it takes to get it working reliably.

    As an aside its like layout. I get annoyed when people say "it...
  20. Closed: Re: LT1681 Forward controller in offline use? (low current sense threshold of 150mV)

    Won't the built in gate driver also run into problems driving larger fets too? That low side sensing scheme is used in converters in the kw range. The controller has blanking which should help.
    ...
  21. Closed: Re: Full Bridge synchronous rectifier controller malfunctions in LTspice

    Have all the other pins risen to their steady state value? Did you consider it may be trying to accurately simulate startup time of internal circuitry?

    And did you check the part's test fixture...
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    Closed: Re: How to Measure Creepage Distance

    Note that it's unlikely the pins of your TO-220 are across a safety isolation barrier. Primary-to-primary or secondary-to-secondary spacing are more of a problem for you and product reliability than...
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    Closed: Re: Low Noise Adjustable Linear AC-DC Power Supply

    Any thermal shutdown protection?
  24. Closed: Re: PI compensator implementation in microcontroller and calculation for that

    P = Kp*X
    I = Ki*X + I
    Y = P + I


    Where X is the compensator input and Y is the output. This represents a transfer function of Kp+1/(Ki*[sample rate]*S). That laplace function can be plugged...
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    Closed: Re: buck inductor losses

    Not necessarily because additional turns increases the magnetic field change (thus core losses) for a given ripple amplitude. I guess I'm not sure of that exact relationship but increasing turns...
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