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  1. Replies
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    Closed: Re: Small Inductor in Buck DC/DC Converter

    The BOM in your link calls it “High frequency chip inductor”. Seems likely that it’s answered: high frequency noise suppression.
  2. Closed: Re: High Frequency operation of Three level DC/DC Converters

    Yes google says that's a 3 level. It puts out 0, +/- 0.5, +/- 1.



    There are a million demo boards and reference designs of LLC and Phase Shifted Full bridge's running off 400V. 300V is no...
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    Closed: Re: 12V to 220V with no isolation

    Non-isolated boost converters are quite common.

    If you don't need isolation you don't need isolation.

    But the problem is you have a high boost factor of about 20. This demands extreme duty...
  4. Closed: Re: Designing a current source for an unknown load

    Suggestions (assuming Q25 is the low side fet we're talking about....what is Q23?):
    1) Add an integrating cap between your opamp output and inverting input for some compensation. Use...
  5. Closed: Re: Designing a current source for an unknown load

    I assume this is your loop performing poorly.

    It may have marginal stability, low bandwidth and/or windup (the loop starts trying to push full current).

    High-side/low side is irrelevant. ...
  6. Closed: Re: overcurrent and reverse polarity protection

    This is a great opportunity to learn a simulation tool.

    Download LTspice.
  7. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    Yeah the switching waveforms look ok.

    Another suggestion: Run open voltage loop. Reconfigure the eamp as a fixed voltage follower. This will isolate eamp problems from other problems.


    For...
  8. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    Type III compensation should follow standard practice: two zeros placed in front of the LC cutoff, 2 poles following later. Intersil has the best app note...
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    Closed: Re: Shortcircuit protection circuit

    I second the complaint about editing time frames.


    Also I'm going to plug integrated 'load switch'/'hot swap' solutions for this 24V application one more time.

    For 5V (usb), 12V or 24V at low...
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    Closed: Re: MAX485 ground isolation

    Yes, isolation can solve a lot of problems.

    To be clear the maxm22511 includes an isolated DC-DC.

    If you already have a power source on each side choose a cheaper isolated 485 IC such as...
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    Closed: Re: MAX485 ground isolation

    There are many isolated RS-485 solutions which could solve a lot of problems including some new integrated power ICs:

    MAXM22511

    And search "isolated RS-485"
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    Closed: Re: 1.5kva pure sine wave inverter

    Yeah this is going to be a monster.

    20Khz is slow and will result in a huge inductor. Why not higher switching frequency?

    Multiple phases would also be a common approach to this problem.
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    Closed: Re: Simple Power Supply with Noise Problems

    Wait, let's be really clear. When you say "The noise is 'real' - grounding does nothing" does that mean you still saw the noise after grounding the probe tip?

    I meant you should leave your probe...
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    Closed: Re: Simple Power Supply with Noise Problems

    The noise is at 40khz and your switching is at 40khz so it's switching noise correct?

    First figure out of its 'real' by tying your scope probe to ground and see if its scope noise or common mode...
  15. [SOLVED]Closed: Re: Voltage to frequency converter - problem with simulation

    Have you looked at IC solutions:
    https://www.analog.com/en/products/ltc6990.html
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    Closed: Re: Shortcircuit protection circuit

    So you have a 24V supply and you want to protect its output from short circuits?

    The good news is that there are many IC's that will do this by acting like a 'smart fuse'. You want to search...
  17. Closed: Re: Misconceptions and flaws noticed by the more educated...

    I'll use this as an example to re-iterate my point that a single model doesn't need to explain everything for everyone.

    A BJT can be usefully modeled as voltage controlled -> Good for some things...
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    Closed: Re: Fast rise time Mosfet

    Look at EPC GAN fets:

    https://epc-co.com/epc/Products/DemoBoards/EPC9049.aspx

    This half bridge demo board demonstrates 1.3nS rise times at 48V/4A.
  19. Closed: Re: TL431 temperature compensation method question

    Yeah to echo what Klauss said where is this reference going?

    Every part it touches needs to be in the 10ppm territory if this ref is going to help you. That means expensive resistors or matched...
  20. Closed: Re: TL431 temperature compensation method question

    Yeah, not too hard to find a better reference.

    And don't forget the resistor drift.

    It's better in terms of cost/performance to get a fixed voltage reference than to buy low PPM resistors...
  21. Closed: Re: The simplest definition of VOLTAGE you can come up with

    I don't know about definition but the best analogy in my mind is pressure or force.
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    Closed: Re: Optimizing case statement with large input

    These two examples will produce identical hardware. By default consider it a mux but as FvM points out the synthesizer will optimize further based on what's in the case/if statements.
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    Closed: Re: if/else vs. if/if in combo logic

    Yes they will synthesize to the same thing.

    I'm personally ok using that coding style but only if there is a reason. In this toy example the first example is better practice. But sometimes the...
  24. Closed: Re: Misconceptions and flaws noticed by the more educated...

    A voltage also needs to have a current. Either in the form of leakage or the parasitic C of the node must have been charged with current in the past.


    As another aside I think it's important to...
  25. Closed: Re: Misconceptions and flaws noticed by the more educated...

    This isn't exactly education but a common practical mistakes I see new people making is that they trust what they see.

    If you measure a node and the multimeter reads 5.2V it means the node you...
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