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149 Threads found on edaboard.com: Feedback Compensation
Hello, On page 12, 13 and 14 of AN1059 application note they do the feedback compensation for the L6561 flyback power factor corrector circuit. However, considering the equation at the bottom of page 13 (H(s)), or any other transfer functions listed, -None of them include the effect of the opto-coupler pole. ****AN1059 Flyback PFC appli
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 loop co
hello, do you know where to put poles and zeros in an smps feedback compensation circuit? ..say an isolated , offline one transistor forward converter
The compensation of an amplifier is needed for it to operate in a negative feedback orientation. Phase margin is really only a measure of stability when an amplifier is used in a unity gain configuration using negative feedback. feedback is used to provide a specific gain (or gain vs frequency in the case of a filter (...)
Hi: I have a small question about this opamp compensation as shown below. the feedback is not shown but you can see C2 is used as the compensation cap. on the other hand, there is a RC filter (R1-C1) used at the output of the 1st stage folded-cascode amplifier. This block indeed improves the compensation result. Can any (...)
hello can any reader describe SMPS feedback compensation using time domain discussion, and with an like a man balancing a broom on his palm etc etc. I feel frequency domain explanations with poles and zeros etc are less useful, the freq dom. being more for calculation than explanation
Hi, Am i right to say that 100Hz ripple that appears at the output of an offline SMPS cannot possibly be removed by any kind of feedback compensation circuitry ? Thanks in advance.
hi since PKS606 is an ON/OFF smps controller and needs absolutely no feedback compensation components whatsoever...and does 120W supply.... .....why does anyone bother to do feedback compensation at the PKS606 shows....it's not necessary. do readers know wh
grittinjames, not sure how that circuit helps the OP. eem2am, you can find good information for feedback on some of ST's Flyback converters with 6561 application notes. They go into pole analysis in some detail. If you've got severe oscillating problems I would be looking at the resistive biasing of the feedback network to begin with - i
What is going on about these poles and zeroes compensation in feedback loop of switching power supplies? Why to worry about this? What if I won't do such compensation?
Hello, This circuit is in between output 36V_A and feedback optocoupler in flyback dc/dc converter. Could anyone help to explain what R813, R821, C819, C820, C822, C825, C821 R822 and C825 are meant for? Thanks, bittware
That's exactly part of the theory of Miller compensation. With the Miller cap, the dominant pole (at 1st stage output) is slowed down because of the compensation capacitor (~Cc*A2, where A2 is the second stage gain), while the secondary pole (at the 2nd stage output) is pushed out due to the feedback through the Miller cap: at the 2nd (...)
Start by reading this paper. Essentially, a cap in series with the feedback resistor of the amplifier will give you the zero at the frequency: fz=1/(2*Π*RC) The cap will affect the position of the pole, but only slightly.
P means proportional, such as a resistor makes the feedback compensation loop,Vout/Vin=-Rf/R1. I means integral, such as a capacitor makes the feedback compensation loop, Vout=(-1/(R1*C))*∫Vin dt, or Vout=-1/(S*R1*C)*Vin. D means differential, such as the input signal pass a capacitor and a resistor makes the (...)
The noise of a two stage amp is set by the feedback factor and compensation capacitor. Increase Cc to get lower noise. Bastos
ednan, I'm assuming that when you use the term "feedback" that you mean "negative feedback". With that in mind: i true ii False Negative feedback always reduces the sensitivity. iii False However, properly designed compensation networks can allow negative feedback to stabilize a system that is (...)
Introduction There are many benefits which result from the use of feedback in electronic circuits, but the drawbacks are the increased complexity of the calculations and the opportunity for the resulting circuit to ring or oscillate. This paper employs graphical techniques to simplify stability calculations, thus enabling the designer to achi
1. the inverse laplace transform of a RHP pole term will be a increasing exponential (or increasing amplitude sinewave) which is not bounded. This is defined with unstable. 2. yes, it's phase is like LHP zero 3. every practical system should avoid it. for compensation, books about control theory or feedback amplifier design would be useful f
Dear Sir: Could someone tell me why in some of the high speed cirucit design has the feedback loop, even the loop didn't have the compensation element. In the other words, the circuits use the unstabled negative feedback. What's the different of positive feedback and unstabled negative feedback? I know (...)
You can take a differential in and out OpAmp, remove its compensation capacitors (as no feedback will be used), and use it as a comparator. If open loop of the OpAmp is high, it will function well as comparator.