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Type: Posts; User: crutschow

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  1. [SOLVED]Closed: Re: Average vs RMS load-current for LDO design

    A significant point missed is that RMS current only works as an indication of power with a resistive load.
    For a constant voltage load, such as a switching power supply, the average current is the...
  2. [SOLVED]Closed: Re: Average vs RMS load-current for LDO design

    As I stated, for a steady DC output, such as from a linear regulator, the average current is the same as the RMS current (for DC the RMS calculation is trivial).
  3. [SOLVED]Closed: Re: Average vs RMS load-current for LDO design

    For a DC current, the average and the RMS are the same.
  4. Closed: Re: Determining output impedance in LT SPICE

    Well, commonly when the term transistor is used without any further information, BJTs are being referred to.
    So you'll have to pardon me If I didn't realize you were referring to MOSFETs.
  5. Closed: Re: Determining output impedance in LT SPICE

    For gm, you can vary Ib and do waveform arithmetic of Ic/Vbe (right-click on the waveform title).

    For output impedance, you can vary the collector voltage and do waveform arithmetic of Vce/Ic for...
  6. [SOLVED]Closed: Re: type 1 compensation in voltage regulators

    As noted, the regulator feedback loop is DC.
  7. Closed: Re: sampling rate vs rate of change of input for control system

    No.
    You get 20 points with a 12-bit resolution for each point (sample).
    You are confusing time resolution with amplitude resolution.
  8. Closed: Re: sampling rate vs rate of change of input for control system

    That doesn't make sense.
    rps is a velocity, not a change in velocity.
    Do you mean 100rps/s change?
    How fast does the velocity change and what speed of correction you need?
    Also what are you...
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    Closed: Re: Digital De-emphais Error

    Sorry but there's way too little info to answer your question.
  10. Closed: Re: shunt 24V rail to reference voltage using opamp?

    An apparent problem is that the negative feedback loop has no compensation for the added loop gain from the transistor.
    That can lead to an unstable output.

    How is the 200mA bus current limit...
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    Closed: Re: Using AD627 with gain > 1000

    That's why gain is distributed over more than one stage since, with lower stage gain, the bandwidth of each stage can be higher.
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    Closed: Re: Using AD627 with gain > 1000

    Try it at the gain you want and see what happens.

    Alternately why not just add a rail-rail op amp gain stage at the output of the AD627?
  13. Closed: Re: switching a resistor into circuit using mosfet

    R8 and R9 are way too low in value as each resistor will be dissipating 10 watts.
    Change then to something like 10k ohms.
    If you want to determine the power dissipated in a device after a...
  14. Closed: Re: Passing both DC and pulses through a toroid?

    If you apply an ideal DC voltage source, that source has zero impedance, so any pulse applied at a different winding will be absorbed by the source, since it's effectively an AC short.

    If you want...
  15. [SOLVED]Closed: Re: Rookie making an audio step-up transformer

    Winding you own transformer is a difficult task.
    Why not just buy a small audio transformer, such as one of these?
    The small ones are only a few dollars.
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    Closed: Re: ADC input with low pass RC filter

    You say ADC and then you mention PWM, which is DAC.
    Which are you really trying to do?

    It it's PWM DAC, what is the highest modulation frequency of the PWM?
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    Closed: Re: Buffer Circuit Question

    Exactly what are the input and output voltages that show this offset?
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    Closed: Re: Photocoupler Saturation?

    For that I think you will have to go with a faster opto, such as the one in post #5.
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    Closed: Re: Photocoupler Saturation?

    If lowering the load resistor value still does not give a fast enough response, you may have to use a faster opto such as a 6N136 (LTspice simulation below).

    155983

    How fast a response do you...
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    Closed: Re: low voltage indicator

    Below is the LTspice simulation of a circuit that should work for you.
    It uses a TLV431 low-power programmable reference (about U$0.60) as a comparator with a built in 1.25V reference voltage.
    The...
  21. Closed: Re: Active Precision Current Limiting circuit needed

    Yes.
    Below is a graph from the AL5809 data sheet showing current vs. voltage across it.
    It reaches the 100mA limit at a little below 2V.

    155836
  22. Closed: Re: Active Precision Current Limiting circuit needed

    Yes, that is true.
  23. Closed: Re: Active Precision Current Limiting circuit needed

    How about the AL5809?
    It's inexpensive, requires no extra parts, and can be purchase with a 100mA rating.
    The data sheet show in operating down to about 2V across it.

    Below is a discrete circuit...
  24. Closed: Re: Is a tantulum different from a microfarad tantulum cap?

    Tantalum is a type of electrolytic capacitor.
    Microfarad is 1 millionth of a farad, which states the charge storage capacity of the capacitor.
  25. Closed: Re: Active Precision Current Limiting circuit needed

    What is the load resistance range?
    What is the minimum supply voltage?
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