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149 Threads found on Feedback Compensation
Check feedback node with montecarlo for offset.
Why can't the LT1009 be used in place of TL431 as an opto-coupler based feedback regulator in SMPS's? i.e. in the following type of feedback circuit..... ..after all, they are both Shunt Voltage Regulators. LT1009 DATASHEET TL431 DATASHEET h
They are just opamp feedback elements. Why they are used I don't know. So you didn't yet understand the concept of loop frequency compensation. Without C9 and R6, the TL431 would amplify the error signal by it's open loop gain, which would effectively cause the TL431 to set the LED current to either fully on or fully off, before the
Vreg=(1+R2/R1)Vref No: Vreg=(1+R1/R2)Vref Should I feedback 90% of output voltage instead? Of course! The feed-back voltage must be equivalent to your ref. voltage.
Hi, You should go through a few books like "Power supply cookbook" by Marty Brown and you will be cleared about feedback loop compensation. Hope this helps. Tahmid.
A crossover frequency in a speaker system is the frequency where the woofer's output is reduced and the tweeter's output is increased. An opamp has frequency compensation so that it does not oscillate when negative feedback is applied. The frequency compensation causes the gain to decrease starting at a very low frequency and the gain (...)
These are different things. One stage OTA, or rather an amplifying stage with one high impedance node, that is meant to work in a feedback configuration is compensated by a cap to ac ground. If you have a 2 stage amplifier you also have two poles which in uncompensated state are kind of close to each other. You can still compensate by a cap to grou
While using SG3524, for buck converter, I need to give a feedback to the error amplifier at pin 1. At the output of the error amplifier (pin 9) I have the Caps and Resistors for compensation. Do the capacitors here need to be ceramic disc capacitors necessarily? Or any specific type of capacitors?? Cannot I use Electrolytic aluminium capacitors? T
i have designed a two stage fully differential opamp with hybrid ahuja compensation (that is, two compensation capacitor used in the two cascode nodes of each branch), the first stage is folded cascode, the second is common source, and the CMFB is continuous common mode feedback which have two input pairs, one pair connected to vcm, the (...)
The problem could be often that the CMD feedback transfer function of the external opamp connection have a less favorable effect to the connected loop gain. For better diagnosis a schematic is helpful. A strategy is to assign the CMD control less gain within the opamp. If the CMD regime is medium output voltage sense and control similar cu
The second opamp should be thought of as a comparator. The error signal from the feedback amplifier is compared to the sawtooth to form a pulse width modulated pwm signal.
I guess there will be a feedback when the electrochemical cell is included. Right in principle, but additional frequency compensation respectively I or PI feedback charateristic may be required for stable operation because the OP open loop gain is possibly too high. You can refer to electrochemical sensor application literature
The second circuit oscillates at 50hz during startup because the bias for the BF422 is bouncing up and down because the output transistor is causing it to jump up and down. it is positive feedback. So RC filter the bias for the BF422 transistor.
My project need a class D Vin from 2.2v to 5v, Po=3watt 8ohm loading, capless. I an a newer, need experienced engineer help for that: 1) loop analysis? 2) how to design feedback circuitry? 3) how to design EA, and compensation? 4) how to design the main comparetor? 5) any thing eles?
Hi, I tried to make a constant current LED driver using UC3845 to which vtg feedback is given as the drop accross sense resistor. Even though it is working the loop seems not stable. i am seeing a ringing which mayrequired slope compensation. Any body plse help me how to solve this
Hello most excellent and superb people of the Forum, Has any reader any introductory documents on how to model an SMPS for the purposes of performing optimal feedback compensation.? eg PWM switch loop model State Space Averaging model
I would like to know if resistor R17 (120K) at the bottom of Figure 9, Page 3-17 is part of the feedback compensation components, or is it simply a potential divider resistor? In other words, does R17 have an effect on the phase margin and the gain margin? The document I refer to is slua124 ???. ?THE UC1901 SIMPLIFIES THE PROBLEM OF I
As is well known, only the dominant loop poles can be used for compensating a negative feedback amplifier. To determine the dominant poles one then compares the sum of the loop poles with the sum of the system poles. The set of loop poles which sum is larger (less negative) than the sum of the system poles (more negative) are the dominant ones domi
Hi All, how this feedback circuit to compare both +/-30V and finally send to photocouple? Can anyone briefly explain me what the resistor, capacitor and transistor function that using in this circuit? Please help me, your explanation will kindly help my understanding.. thankyou
hello, does any reader know if Pressman's book covers feedback compensation with TL431 and opto. Or does any reader know any book that does...other than Basso, which covers it but ony for the fast lane/slow lane case