All Questions
Tagged with compensation stability
13 questions
2
votes
1
answer
163
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Stability issue: Compensation changes using Bode plot in LTspice
I am encountering issues with a LT8390 design, particularly in higher load current conditions, which leads me to suspect a stability problem. The design parameters are as follows: vin 18-36 (28v ...
- 534
2
votes
0
answers
187
views
AC analysis of SMPS shows instability. How to modify the analysis to reflect the transient stability?
Background
I have designed a switch-mode power stage with voltage-mode control that uses an LCLC filter in its output to obtain a very low ripple output voltage.
I have empirically arrived at a ...
- 23.4k
2
votes
2
answers
246
views
14-Volt 6-Amp Power Supply Stability
Design Requirements:
The purpose is a linear DC power supply for 12-volt aircraft, marine, and amateur radio equipment
power source 20 volts @ +/-10%. (output 85W = 6A*14.2V)
Rser on V1 = 0.4 or ...
- 1,158
2
votes
1
answer
302
views
What is the better way to stabilize this discrete op-amp and why?
I have the following simple op-amp circuit, which is meant to drive a MOSFET (M1) gate and work as a voltage regulator. It is discrete for a mix of reasons (necessary bandwidth, using existing BOM ...
- 23.4k
1
vote
3
answers
834
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Problem stabilizing this PMOS LDO
I am considering a discrete LDO for a supply rail that needs ~\$m\Omega\$ impedance at 10 kHz.
While the following circuit does what I need (according to Spice), it becomes unstable if C2 is smaller ...
- 23.4k
5
votes
2
answers
810
views
Flyback power supply instability issue
I have created a switching power supply:
Input: 230 V AC
Output: 12 V DC, 1 A
Controller: UC3844
Topology: flyback
Switching frequency: ~ 100 kHz
Schematic:
When I start this power supply, output ...
- 5,528
0
votes
0
answers
191
views
IGBT Temperature Drift: How to Achive Stability?
I remember the BJT transistor circuits are designed to compensate for the fact that the parameters of the transistor change with the temperature. I could not find similar ready-to-use solutions for ...
- 191
2
votes
2
answers
1k
views
Frequency compensation and feedback capacitance
I was reading the chapter of Microelectronic Circuits (Sedra Smith) about negative feedback systems, and it shows an example of Miller frequency compensation with the capacitance Cf shown in the ...
- 3,590
1
vote
1
answer
120
views
Stability of SMPS designed for a motherboard
Many books have covered the stability of many configurations of switch mode power supplies and they have given details on how to set the poles and the zeros of the compensator to make the the power ...
- 1,078
0
votes
4
answers
2k
views
Negative feedback and op-amp poles
I'm trying to get a better understanding of frequency compensation for op-amps. I'll start off with a very specific questions and then get into the context. For a certain op-amp, open loop gain is ...
- 15
0
votes
1
answer
665
views
AD4610 - Is it possible to eleminate this single overshoot
I am trying to compensate input capacitance of the AD4610. It does not matter if it is actually over- or undershooting - there is always a spike:
I do not have this problem with the OPA4141 for ...
- 2,634
7
votes
2
answers
2k
views
Understanding in-loop compensation for capacitive-loaded OpAmp
I'm trying to understand the in-loop compensation for a simple amplifier loaded with a capacitive load, as seen in this article from Analog:
http://www.analog.com/library/analogdialogue/archives/38-...
- 133
0
votes
1
answer
68
views
Stray Input Capacltance Compensatlon with constant-GBP OpAmp
In the book: Design with operational amplifiers and analog integrated circuits, section 8.2, it shows a circuit as below:
And give:
$$f_{z} = \frac{1}{2\pi(R_{1}||R_{2})(C_{n}+C_{f})},\:f_{p}=\frac{...
- 5,886