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Recent content by ynhe

  1. Y

    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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    SMPS with no loop compensation

    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, “A New, Continuous-Time Model for Current-Mode Control,” IEEE Trans. on Power...
  3. Y

    SMPS with no loop compensation

    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 averaged output current depends on the switching frequency,output...
  4. Y

    SMPS with no loop compensation

    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 control,the inner slope-cpmpensation must add when duty>50% in CCM. PFM SMPS need no...
  5. Y

    Ac analysis of switched capacitor circuit

    ac simulation switched capacitor Try Simetrix/Simplis for SC frequency-domain analysis.
  6. Y

    which is the best PCB tool

    I use ORCAD and PowerPCB B/R
  7. Y

    Why high gain in opamp ?

    in order to get high open loop gain in a opamp negative feedback system. b/r
  8. Y

    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 frequency-domain analyzer specifically designed for the analysis of switching piecewise-linear...
  9. Y

    how to simulation the switch cap circuit

    You could use Simplis. B/R ynhe
  10. Y

    TI's White LED Driver TPS61165

    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) LG is open loop gain. if dc of LG is 60dB,the offset of E/A could reduce 1/1000. So...
  11. Y

    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
  12. Y

    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 plot). b/r
  13. Y

    How to simulate a huge mixed signal circuit?

    ADIT is very fast.
  14. Y

    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 time according to the input voltage adaptively and keep the switching frequency pseudo-constant.
  15. Y

    Looking for the LM35DZ sensor Spice model

    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 R2 Out 0 0.1 .ends *********************************************************
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