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  1. Replies
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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...
  4. 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...
  5. 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...
  7. 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...
  10. 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...
  11. 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...
  13. 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...
  15. 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 ->...
  16. 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...
  17. 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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    Closed: Re: Bridge diode thermal problem

    Don't use a 1000V rectifier for 20V...

    Schottky's should work well at these voltages.
  19. Closed: Re: Supply 5V, 5mA from the 240VAC mains without SMPS

    Add these lines to standard.mos (probably in C:\Users\youruser\Documents\LTspiceXVII\lib\cmp) to add these to your fet library.



    .MODEL DN2540 NMOS (LEVEL=3 RS=1.05 NSUB=5.0E14 DELTA=0.1...
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    Closed: Re: default statement in case

    Correct in general. Though you show two different things in your example: defaulting to state versus idle.
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    Closed: Re: PCB flexion and cracking of SMD capacitors

    Yes size makes a big difference. I've been told by sales reps to stay 1206 and below when possible.

    We've had big problems with 18XX and larger ceramics failing. None with anything smaller.
    ...
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    Closed: Re: PCB flexion and cracking of SMD capacitors

    See figure 8 in this document discusses exactly this:
    https://www.digikey.com/Site/Global/Layouts/DownloadPdf.ashx?pdfUrl=9A23B3687C14472482403C3540CC7267

    Flexing the long way is the worst

    In...
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    Closed: Re: Limit Current Maintain Voltage PSU output

    Impossible.

    Voltage and current go hand in hand.

    To control one you have to modulate the other.

    Voltage sources regulate voltage by modulating current.

    Current sources regulate current by...
  24. Closed: Re: How to find if a simple regulator is oscillating

    Ok fair enough. I'm probably recalling the small lower voltage variants I typically use.
  25. Closed: Re: Supply 5V, 5mA from the 240VAC mains without SMPS

    155889

    (For some reason I love these high voltage linear circuits...)

    Here they are with a higher current mosfet and the current limiting resistor R7/R8 which creates a Vgsoff/R8 upper current...
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