All Questions
Tagged with buck power-supply
25
questions
9
votes
3
answers
4k
views
Snubbing DCM (nonsynchronous) Buck converter
FINAL UPDATE:
I've posted an outcome report below. I'm very satisfied with how this has come out and I learned a lot in the process. More details and before/after shots in the answer below. Thanks to ...
- 7,172
1
vote
1
answer
691
views
Is there a good topology for splitting a DC power supply from a few LM2576 and LM2577?
So, this isn't the most serious project, more of a toy/hack, but I have a some LM2576 and LM2577 and I wanted to see if I could somehow get an adjustable dual rail (bipolar) supply out of them, for ...
- 793
0
votes
1
answer
2k
views
Multiple Input supply switching
I'm looking into designing a power supply for an RPi that can take both USB and battery at the same time, but only pull power from one of the sources. I'm not quite sure how to go about it, I was ...
19
votes
6
answers
14k
views
Why do buck (step-down) switching regulators require an inductor and diode?
So, I understand, at least at a basic level, the method of operation of switching converters, both buck and boost. What puzzles me, though, is why buck converters in particular aren't simpler.
Why ...
- 7,749
6
votes
3
answers
2k
views
Buck Converter dies unpredictably upon connecting power
I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
3
votes
1
answer
717
views
Is it useful to think of SMPS input capacitance as part of an LC filter?
I'm at the stage of learning about switched-mode power supplies that I'm focused on understanding the role of input capacitance. Just for background, I'm working with a buck topology for this ...
- 7,172
1
vote
1
answer
1k
views
DC-DC buck regulator MP2359 sometimes damaged when input voltage is high
I use MP2359 (datasheet pdf) to convert high voltage into 3.3V. The input range of voltage is from 4.5V to 24V.
At low input voltages, things seem to be OK. However when I input a voltage of 21V (...
- 475
0
votes
3
answers
1k
views
Redundant DC-DC converter (parallel)
I am building a flight computer for a sounding rocket. I want to include redundant power supplies - in other words: parallel DC-DC converters. What do I need to consider in order to do this? (is my ...
- 57
14
votes
1
answer
3k
views
Noise problem with buck/boost switching regulator
I am designing a electrical device for a research project (I'm a PhD student, but unfortunately not EE!). More info on the device can be found at http://iridia.ulb.ac.be/supp/IridiaSupp2012-002/
The ...
- 435
12
votes
2
answers
3k
views
Routing a buck/boost DC/DC converter
I need some help with the layout of a power supply. I botched the first two iterations as I do not have the necessary experience, and I would like to avoid another costly run.
For the sake of ...
- 435
6
votes
2
answers
968
views
How to measure the stability of a buck converter using LTspice
Below is my buck converter circuit. How can I check its stability using LTspice?
I need to measure GM and PM.
Is this true that a 30–60 degrees phase margin and a gain margin of 2–10 dB are desirable ...
- 2,593
5
votes
2
answers
1k
views
Switching regulator layout advice
I am planning to use a Diodes AP5100 switching regulator to go from ~22V to 12V in my circuit, which will have a max current draw of about 1A. This is my first attempt at laying out a switching power ...
- 250
4
votes
2
answers
3k
views
LTspice Frequency Response Analyzer (FRA)
This post is a continuation of this question.
LTspice recently introduced a new feature called frequency response analyzer, see the image below.
The green box shows the symbol for FRA. If you click ...
- 2,593
3
votes
1
answer
4k
views
Can a CM choke be used to suppress common mode current in a DC circuit?
I have a setup with a DC/DC converter like in the figure below. I need to minimize common mode current on the supply input.
There are no other connections besides Vsupply + and - and Rload + and -.
...
- 31
2
votes
2
answers
599
views
Can anyone help me with this delay problem in my UPS circuit?
I am trying to build an UPS for my laptop. My laptop doesn’t have a battery and battery port is damaged, only way I can power my laptop is from the DC port. But the problem is where I live power ...
- 23