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    Closed: Re: SMPS power stage bode plot

    An open loop current mode controlled supply has a DC gain of infinity. A small current will infinitely charge the output capacitor. Load R brings that down, flattening the top of the bode plot.
  2. Closed: Re: Passing both DC and pulses through a toroid?

    Not to disagree but to add: my preference is to understand AC as DC that just happens to eventually change polarity sometime in the future.

    It all depends on frame of reference really. DC is only...
  3. Closed: Re: Passing both DC and pulses through a toroid?

    Here is my overview of transformers in general that might help. Online resources are actually quite poor in my opinion at covering some of this.

    Voltage on winding-> [Magnetizing Current]' ...
  4. Closed: Re: Passing both DC and pulses through a toroid?

    Again: If the transformer isn't saturated then the simplest model is to consider all wingdings as tied together. If you apply 5V to one then 5V comes out all the others. You can't then apply 0V to...
  5. Closed: Re: Passing both DC and pulses through a toroid?

    An ideal transformer does work with DC.

    A real life transformer can't transmit DC because the core eventually saturates (primary inductance isn't infinite therefore magnetizing current increases...
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    Closed: Re: Buck converter vs buck-boost converter

    He's probably referring to the 4-switch circuit (like the LT8705) with 2 fets replaced by diodes (which I've also referenced a couple times). That essentially is a cascaded buck with a boost but...
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    Closed: Re: Buck converter vs buck-boost converter

    I doubt you'd ever lay out a switching supply without a bypass directly across the switch commutation loop.
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    Closed: Re: Buck converter vs buck-boost converter

    That's exactly the circuit I was referencing. But take a closer look and you'll see your wikipedia diagram is the same topology as mine. Your diagram's input is my C, output is B, cap A is omitted...
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    Closed: Re: Buck converter vs buck-boost converter

    When you search 'Buck-boost' that's the circuit you get. The original question was about efficiency - it seems rather obvious a 4-switch buck boost is less efficient since in either mode it adds...
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    Closed: Re: Buck converter vs buck-boost converter

    I had wanted to post this. This is how I visualize the 2-switch buck-boost and its relationship to boost and buck - they're all the same just different inputs and outputs (and sometimes fets...
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    Closed: Re: Buck converter vs buck-boost converter

    No equation because like other switching topologies in theory it has perfect efficiency.

    So also like other switching topologies calculating losses is tricky and depends on accurate information...
  12. Closed: Re: Output short circuit current of operational amplifier

    I'd do open loop with the opamp trying to drive to one rail.

    It tells you the upper bound on output current. For cheap/poorly specified opamps it may be the only indication of output current...
  13. Closed: Re: Detect the absence of sampled AC signal (from digital filter) in verilog

    Timing window can be anything greater than the period of the slowest signal in this case. I'm proposing a simple peak detector so it just needs to catch at least one peak. To be clear my logic is...
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    Closed: Re: Buck converter vs buck-boost converter

    Either one is theoretically 100% efficient.

    It completely depends on the system architecture.

    That said there is a reason there are more bucks than boosts in most system. It's typically more...
  15. Closed: Re: how two nodes are communicating in CAN bus protocol?

    No I believe in this regard CAN is like I2C (also multi-master). Any node can be a master and to initiate a transaction it broadcasts the ID of the node it wants to talk too where the ID also...
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    Closed: Re: Identify an electronic component

    My guess: Voltage Regulator
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    Closed: Re: Implementation of ADC

    You'll find a handful of tricks for using digital FPGA pins as an ADC. For example an LVDS input is basically a comparator. If your FPGA has that as an option you can compare an unknown input to a...
  18. Closed: Re: Simple question on Transresistance Amplifier circuit

    Yes I think Klauss described it well.

    The light provides energy so inside the diode there is a source that does produce voltage. That source is then shorted out by the opamp circuit and the...
  19. Closed: Re: Why are SMD components so much smaller than their THT versions?

    Well don't be fooled by mosfet ratings.

    When it comes to heat dissipation size matters. Even with the same "200A" die you'll be able to push more power from a bigger package.

    You need to...
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    Closed: Re: Instrumentation AMP Virtual short.

    Right, no virtual ground for an inst amp.

    They act as a fixed differential in to differential out gain block with high input impedance.

    This inst amp defaults to gain of 1 which can be...
  21. Closed: Re: multiple channel "DC OK" signal ANDing with galvanic isolation

    You could do that.

    But Much better (cheaper/smaller) to AND all the signals with a couple multi-input compact gates and then send the result through a single opto.
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    Closed: Re: using a power inverter in a car

    Not really. The 14-15V is being regulated by the alternator and it isn't going to like it's output being 'shorted' to 12V across a zener. Plus the zener will melt.

    I think you have a...
  23. Closed: Re: Detect the absence of sampled AC signal (from digital filter) in verilog

    I wouldn't look at zero crossings because there will still be noise, perhaps AC mains pickup, when no signal is present. I've done this:

    AC Signal -> First order IIR low pass -> Absolute value ->...
  24. Closed: Re: Get phase precisely through longer sampling time

    Yes it's basically just averaging. All samples have noise. If you make a decision with a few samples it will be more likely wrong than making a decision with many samples.

    In my experience...
  25. Closed: Re: What is the future of Boolean algebra-based languages and methodologies?

    C to gates has happened its just not good yet. I prototyped a PID controller in C and it was super quick to get the basic algorithm running. The problem is that you're still on the hook for...
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