Questions tagged [error-amplifier]
The error-amplifier tag has no usage guidance.
37 questions
2
votes
1
answer
76
views
Charge pump with MOS-error-amplifier, please help me understand this circuit
Could you please help me understand how this circuit works?
In my RF classes I was introduced the Charge pump and at some point we were given these two following schematics:
NOTE: I have no idea ...
- 21
0
votes
2
answers
130
views
Error amplifier selection
I'm simulating the "voltage error amplifier circuit" referenced from this article
In the article, "Vcontrol" will drop to zero when "Vout" is larger than the reference ...
- 141
0
votes
1
answer
200
views
Why is this LDO circuit not working?
I am trying to generate 5 V with this circuit for a load of 100 mA with a 2% tolerance in the output voltage. I don't want to use LDO ICs due to various reasons.
My intention here is to enable/disable ...
0
votes
1
answer
579
views
UC3842 optocoupler feedback confusion
I am having a slight confusion regarding the selection compensation pin of the UC3842 IC and the current mode control system given in the datasheet.
Why is there an RC combination at the feedback of ...
- 693
7
votes
2
answers
711
views
Understanding this linear series-pass regulator circuit
Please refer to the schematic extract above which is the positive half of a bipolar voltage regulator in an amplifier. It is a mostly classic design but there is a part I don't understand. The part I'...
- 199
0
votes
1
answer
297
views
Building the Error amplifier circuit part of UC3843
I am trying to build an error amplifier circuit on PSIM almost identical to the
In the datasheet, they used
Now, I want to ask in what ways is different than a normal Op-Amp element in PSIM.
...
- 29
0
votes
1
answer
720
views
DC-DC converter error amplifier output
I am new to DC-DC converter electronics. I was wondering what the output of the error amplifier/compensator looks like.
Is the output of the compensator being driven to the Vref value set on the non-...
- 101
0
votes
1
answer
56
views
How come I'm not getting the same output at the EAout, with the unity-gain buffer EAOUT output follows the +IN input
The EAout pin does not output the same signal as +IN, the signal is coming from a voltage divider after full bridge rectification
- 89
1
vote
1
answer
768
views
Need help understanding error amplifier compensation
This application note (for the PWM controller I am using, UC3825B) details about error amplifier compensation for the built-in error amplifier.
It says it will be compensated to cross 0 dB at (...
- 15
-1
votes
1
answer
203
views
The output of PI controller using opamp is not working [closed]
I am designing a closed loop system for dc-dc converter for that I am using error amplifier and pi controller. For error amplifier and PI controller I am using OP177A opamp. The error amplifier ...
- 15
1
vote
1
answer
1k
views
Comparator vs Error amplifier vs OP-amp [closed]
Could you do me a favor? It is my first time to use "StackExchange".
I wonder the different point of these three components.
Comparator vs Error amplifier vs Op-amp (and OTA)
As I found they ...
- 21
1
vote
1
answer
405
views
TL494 error amplifier pin maximum voltage input
I'm designing a 60V SMPD for my CNC milling machine using a TL494.
I've have successfully driven the gate drive transformer which can in turn drive the MOSFETs. I am able to get 60 up to 70V output ...
0
votes
1
answer
743
views
Total voltage error at the output of the Op-Amp
I have this circuit (shown below), I need to calculate the total error voltage at the output of the Op-Amp due to R3 and Vos.
U1 is the LM741, which has Vos = 5mV and ib = 80nA.
Till now I’ve ...
- 17
0
votes
1
answer
743
views
UC3843 Clamping Error Amplifier Voltage
I'm trying to design a constant current solenoid driver using UC3843 PWM IC.
The datasheet is available at https://www.ti.com/product/UC3843
Since I'm only utilizing constant current function using ...
- 155
0
votes
1
answer
3k
views
Error amp compensation on pwm controller
I'm trying to build a half bridge smps for 325 VDC to 30 VDC using SG3525 controller IC.
I have no idea on how to use the error amp on this chip, especially the compensation pin.
[
[
I have seen in ...
- 839
0
votes
0
answers
148
views
How to determine these resistors in 2-pole 2-zero feedback loop compensation
I'm trying to build a 2-pole 2-zero feedback loop compensation for controlling a full bridge dc-dc converter. It's my first time doing this and I'm following the book power supply cookbook. Book is ...
- 319
1
vote
0
answers
526
views
Type 3 Compensation on Full Bridge DC-DC Converter with SG3525
I'm trying to build a 48V-400V full bridge dc-dc converter. I'm using sg3525 as pwm IC and trying to get isolated feedback from output and planing to do it with TL431.
When I study on it people are ...
- 319
1
vote
1
answer
331
views
Non Inverting Type 2 and 3 compensators
I'm looking for the topology and transfer function of a non-inverting type 2 and 3 compensators (PID controller). they are used in CC and CV feedback control in charging/Discharging circuits of ...
- 1,078
0
votes
1
answer
124
views
MCP1630V a battery charger
To charge a 4 cell Li-Ion battery pack, microchip have developped a circuit (board) that I am trying to understand, (the link for the PDF is here:https://www.microchip.com/developmenttools/...
- 1,078
0
votes
0
answers
142
views
Error amplifier in PWM controller
Using the datasheet UC3842 PWM Controller I have modelled error amplifier in it.
AC analysis of error amplifier matches with the datasheet plot(Figure 3)
- Since I need to clamp the output ...
- 305
1
vote
1
answer
143
views
Fatal Error Audio equalization simulation LTSpice
I'm doing a 3s audio.wav simulation on LTSpice with the following circuit (3 band pass filters and amplifiers):
In this example it's boosting the bass and attenuating the highs.
It loads the first ...
- 163
0
votes
1
answer
2k
views
How to calculate error amplifier output in amplifiers
I'm trying to derive an accurate formula for the output of an error amplifier in the class D amplifier I'm simulating. Most literature on the error amplifier/integrator in class D amplifiers glosses ...
- 389
1
vote
0
answers
36
views
sawtooth generator for MCP1630
when using MCP1630V to design a buck converter in voltage mode control, is it preferabale to get sawtooth generator from the drive output pin or from the oscillator input pin?
From the timing diagram ...
- 1,078
2
votes
1
answer
673
views
Current sensing techniques in SMPS
I have gone through the following circuit provided by microchip technology and I get trouble in understanding the circuit circled in red the the image!!
As I understood, this circuit is used as a ...
- 1,078
1
vote
1
answer
2k
views
SMPS Error Amplifier Behavior
In case of switch mode power supplies, we uselly use "Error Amplifiers" (Type 1,2 & 3), my question is:
The output voltage of this amplifier (Verr), is it the DC error of the Vref and Vout (i.e: ...
- 1,078
3
votes
4
answers
1k
views
Compensating for voltage drop across current-sensing resistor in a TL494-based SMPS
I'm trying to wrap my head around this reference design from this TI document.
This is a 5V power supply that is rated at 10A. ...
- 171
0
votes
0
answers
1k
views
PI Controller with XLSEMI4016 Buck Converter, unstable VFB seen
I have the following circuit set up to control VOUT (labelled SENSE on my Excel test results).
Note that the node between REXT, POT, and R_B is called VFB. It goes to the FB pin of the XL4016 chip, ...
- 203
1
vote
0
answers
1k
views
Output Voltage Minimum Limit of LM358 as Error Amplifer
I am using one side of the LM358 as an error amplifier with a gain of 1, biased according to this MIT lesson for differential amplifiers.
The results below show me tuning the reference signal to see ...
- 203
1
vote
2
answers
588
views
Why does the voltage of my Buck converting SMPS drop when a load is added at the output?
I am building a DC-DC buck converting circuit from first principle with no on chip solution. Output Voltage must be 5vdc with a max current @500mA. input is 20+-4vDc. The problem that I am having is ...
- 11
0
votes
2
answers
460
views
Type 2 or 3 Compensator for LDO
Can a type 2 or type 3 compensator be applied on an LDO?
What methods can we use in order to stabilize our Error Amplifier?
0
votes
1
answer
4k
views
How do I configure a TL494 to limit peak current?
I am trying to determine component values to operate a TL494 in a mode that limits the peak current. I am basing this off the datasheet's "Typical Application" (Section 10.2).
My understanding is ...
- 1,259
2
votes
1
answer
361
views
How can i reduce the offset error of the error amplifier of my PWM generator?
Ls,
My PWM generator has an offset error which gives my whole circuit an error above the allowed 0,1% of full scale which is 5V. The allowed error is 5 mV.
This error is noticed when i graph my ...
- 25
6
votes
1
answer
1k
views
Loop compensation design of buck converter
I am trying to design loop compensation with type-3 error amplifier for a buck converter. I'm a student and very inexperienced in this subject. Please bear with me.
Here is the general procedure ...
- 897
3
votes
1
answer
5k
views
Voltage Mode Control of a DC-DC Buck converter
My previous question was about a hysteretic-style buck converter:
Buck Converter Control Scheme- Why isn't just a comparator not enough?
By what I gather from previous answers, a hysteretic-...
- 897
0
votes
2
answers
2k
views
Buck Converter Error Amplifier Input Polarity Confusion (TL598)
I'm trying to design a buck converter using TL598. I'm studying the technical article Designing Switch Mode Power Supplies With the TL598 - Application Report for this purpose. This article references ...
- 14.2k
0
votes
2
answers
15k
views
Transfer Function of PI Controller
Circuit below is an op-amp summer combined with PI controller.
simulate this circuit – Schematic created using CircuitLab
What is transfer function of this circut?
How to calculate each R and ...
- 37
8
votes
2
answers
4k
views
Why do we compensate PWM controllers?
I have been studying switch mode power supplies for a while. I have understood the working principle of several common topologies But there is a detail in the control circuit structures which I still ...
- 14.2k