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Type: Posts; User: ynhe

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  1. Closed: Re: Do you have Basso's book switch mode power supplies?

    In Basso's book "Switch mode power supplies"
    Fsw-SWITCHING FREQUENCY, Hz not rad/s
    M-Conversion ratio,M=Vout/Vin
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    Closed: pfm smps

    Dear eem2am
    I think you do need study some basic knowledge about peak current mode controlled SMPS.I suggest two for you reading:
    1.R. W. Erickson_fundamentals_of_power_electronics
    2.R. B. Ridley,...
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    Closed: control loop compensation

    LED driver is essentially a constant current source.
    In peak current mode controlled buck,If send a fixed error voltage to PWM comparator,we can easily get a constant averaged output current.
    The...
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    Closed: smps loop compensation

    No
    the HV9910B operates in open loop current mode control.There is no closed voltage loop,no voltage feedback,So no voltage loop compensation need.
    But if HV9910B is in Peak current mode...
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    Closed: ac simulation switched capacitor

    Try Simetrix/Simplis for SC frequency-domain analysis.
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    Closed: Re: which is the best PCB tool

    I use ORCAD and PowerPCB

    B/R
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    Closed: Re: Why high gain in opamp ?

    in order to get high open loop gain in a opamp negative feedback system.

    b/r
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    Closed: Re: how to simulation the switch cap circuit

    Hi:
    SIMPLIS (SIMulation for Piecewise-LInear System) is a computer software package specifically designed for the simulation and analysis of switching power supplies.
    SIMPLIS has a small-signal...
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    Closed: Re: how to simulation the switch cap circuit

    You could use Simplis.

    B/R

    ynhe
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    Closed: tps61165 c code

    Hi aryajur:
    The offset of E/A can be seen as disturbances or distortions.
    But it is in the loop of negative feedback.
    Feedback reduces the line-to-output transfer function by a factor of 1/(1+LG)...
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    Closed: Re: AC analysis of switched capacitor filters

    You can build average model for SCF and simulate with Spise.
    Or you could use EDAs,like Simplis.

    b/r
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    Closed: Re: about the LDO loop stability

    1.L=200mH maybe too small.
    try L=1TH and C=1TF to cut off AC loop.
    2.AC source change to AC=1,So only read node 2(here "2" is another end of inductor) voltage can get open loop gain and phase(bode...
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    Closed: Re: How to simulate a huge mixed signal circuit?

    ADIT is very fast.
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    Closed: Re: Constant-on time control mode buck!!!

    You can refer this document for simple theory and seek some Chip application notes and datasheet using Google,like LM1770 LM3100.

    For the large input voltage range,You could change the Constant-on...
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    Closed: lm35dz

    Try this model:
    *********************************************************
    .subckt LM35 Out
    I1 0 N001 1
    R0 N001 0 1 tc1=0.01
    I2 0 N002 1
    R1 N002 0 1 tc1=0.01 TEMP=0
    G1 0 Out N001 N002 10 ...
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    Closed: Re: Audio Line Level output?

    You need a OUTPUT BUFFERS AND LP FILTERS,see datasheet of ad1854 for details

    http://www.analog.com/UploadedFiles/Data_Sheets/AD1854.pdf
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    Closed: Re: Questions about a Linear Regulator

    It's a BUCK DC-DC.
  18. Closed: Re: Can anyone tell me how to design a level shift buffer?Th

    1.Driver output rising time/falling time
    2.Propagation Delay
  19. Closed: ota and opamp

    Free download from here:
    http://www2.eece.maine.edu/research/vlsi/TelescopicOpAmp/McCarthy_548.pdf

    ynhe
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    Closed: Re: 20°phase margin enough?

    I agree with smartdream's opinion.


    B/R
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    Closed: Re: 20°phase margin enough?

    Phase Margin for LDO and dc-dc from NSC.
    A stable loop typically needs at least 20°of phase
    margin for linear regulators and 40°-45°for switching regulators (more is better).
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    Closed: Re: 20°phase margin enough?

    From NSC's application note,
    Stable loops typically require a phase margin of >20° for LDO.
    But I think you need keep some margin in design.
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    Closed: Re: help me analyze the filter circuits(thanks)

    Maybe you could use Simplis to get the frequency domain response
    or you could build a spice equivalent model base on four-port equivalent circuits in the z-domain.

    You could refer some paper:
    ...
  24. Closed: Re: I need to design 2nd order low pass filter and 1st order

    use "Filter Wiz Pro" for your design.
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    Closed: caspoc demo

    simplis and isspice are good
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