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Questions tagged [error-amplifier]

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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 ...
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1answer
76 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 ...
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1answer
102 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: ...
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4answers
371 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. ...
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300 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, ...
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0answers
363 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 ...
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2answers
304 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 ...
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2answers
137 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?
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1answer
1k 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 ...
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1answer
177 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 ...
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1answer
719 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 ...
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1answer
2k 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-...
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2answers
1k 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 ...
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2answers
8k 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 ...
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2answers
3k 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 ...