All Questions
Tagged with smps or switch-mode-power-supply
3,228 questions
9
votes
3
answers
5k
views
SMPS PCB Design Critic
Oldest versions of this post can be viewed through this link.
This is my re-designed layout. What is your view again?
10-32V to 5V 1.2A SMPS Buck Regulator Design.
The IC is IFX91041 from infineon.
...
- 6,010
6
votes
2
answers
863
views
Crosscoupling in SMPS PCB layout
I have been reading this application note from National and I have a question about this phrase:
... traces carrying switching currents/voltages must also
be kept away from ’quieter’ traces to ...
- 6,010
8
votes
3
answers
8k
views
Why is SMPS controller IC failing?
I'm back to diagnosing power supply failures, in an LLC resonant SMPS based on the L6598, from a 400 V PFC supply with ostensibly 400 W output. I'm new to SMPS, and learning this all as I go, and the ...
- 29k
2
votes
3
answers
6k
views
Switching regulator: How to determine maximum inductor current?
I am trying to design a buck/boost converter with the LTC3780 chip from Linear. My specifications are:
Vin = 6 to 32V
Vout = 24V at 100mV ripple
Ioutmax = 2A
Frequency = 300kHz
The datasheet uses ...
- 6,010
10
votes
2
answers
27k
views
Calculating Power Loss in Switching Power Regulator?
I am new to the construction of DC/DC power supplies (still a university student) and have built basic supplies using simple linear voltage regulators. I have recently discovered the world of ...
- 437
1
vote
2
answers
1k
views
Step up DC voltage from 12-24V to 60V
I need to provide a 60V/1A power source from a 12-24V input, -40 to 85 degC temperature range. Parametric searches for DC/DC converters at a couple online vendors don't seem to be turning up much.
I'...
- 3,521
3
votes
2
answers
4k
views
Adjustable SMPS using MC34063?
Is it possible to construct an adjustable output switching power supply based on the MC34063? I read over the On Semi datasheet and app notes but didn't see any examples of an adjustable output ...
- 1,606
23
votes
6
answers
6k
views
What are some common/popular/go-to switching voltage regulators? [closed]
So I've used the popular linear regulators (7805, LM317, LD1117, etc), but I'd like to learn more about switching regulators.
Are there any "must have" switching regulators out there that are as ...
- 1,606
3
votes
5
answers
4k
views
Variable resistor that can handle hundreds of watts?
We have some big resistor test loads, like 8 Ω 250 W loads for simulating speakers:
Are there also big variable load resistors for testing power supplies? What are they called?
If not, what do ...
- 29k
2
votes
1
answer
2k
views
Setting correct operating frequency for LLC resonant SMPS
I need to figure out if an LLC half-bridge resonant SMPS is designed (more or less) correctly. I am not an SMPS designer, and neither is the manufacturer, so I'm just reading a bunch of app notes and ...
- 29k
3
votes
4
answers
1k
views
Building SMPS using L4960: How does the choice of inductor affect circuit operation?
I've decided to conquer my fear of switched-mode power supplies and build one. Right now, I have a L4960 regulator.
Its datasheet recommends use of a 150 μH inductor rated at 5 A. My problem is that ...
- 23.7k
3
votes
2
answers
811
views
What probems may arise with a 200V rated relay conducting 1000V 1A?
I am going to use a DPST relay to pass a 1A 1000V DC signal of an ESD Human Body Model simulator circuit through it.
I have see many relays, they share a property like maximum DC switching for ...
- 3,294
1
vote
3
answers
1k
views
Switching Voltage Regulator with WiFi Ethernet Controller Bad?
I a working on a circuit that has components that need 3.3V and 5V. My power input is 12VDC and can not be changed. The 3.3V components use about 510mA of current and the 5V components use about 155mA....
- 3,777
11
votes
4
answers
4k
views
Different ways to digitally control an adjustable SMPS
I want to make a battery powered, adjustable SMPS for use in situations when I cannot have an outlet near me, so I would like some more information or suggestions about this topic. The SMPS chip I am ...
- 1,090
5
votes
4
answers
3k
views
Short circuit protection for a boost converter
Is it possible to add short circuit protection to a boost converter?
My initial instinct was no, as the switch does not directly control the input to the inductor and this means the minimum output is ...
- 32.2k
5
votes
4
answers
440
views
Obtaining 15 V from a single lithium polymer cell
I want to get 15V output from a 1 cell lithium polymer battery which has a voltage range of 3v-4v. I am thinking about using a 34063 to accomplish this. But will this work over a 1v range or do I ...
- 641
3
votes
3
answers
3k
views
Buck converter with feedback loop
According to this site in a buck converter with voltage mode control the duty cycle is set directly by comparing a voltage ramp to an error voltage. I agree with that. But this is where my headache ...
- 133
0
votes
3
answers
283
views
Is there any way to acquire -12 V from +12 V?
Is there any way to get -12 V (DC) using only:
+12 V DC
Ground
OPAMPs
Resistors
Capacitors
Inductors
Diodes
user2188
6
votes
3
answers
2k
views
Choosing output filter inductors for switching power amplifiers
Class D PWM switching power amplifiers use an LC filter at the output to filter out the switching harmonics:
Other than the inductance value, what properties are important for this inductor? What ...
- 29k
7
votes
2
answers
13k
views
TL431 as a comparator?
One of the things I've noticed in a few power supplies is the use of a TL431, a voltage reference, as a comparator of sorts.
It seems to be set up in a configuration where when the voltage across it ...
- 32.2k
6
votes
9
answers
5k
views
Would this work? Using a computer SMPS as a DC-DC converter
I have this crazy idea of using a computer SMPS with active PFC boost to take high voltage DC battery banks (144V+) and drop it down to 3.3V, 5V and 12V.
Here's my thinking: the power supply ...
- 32.2k
4
votes
2
answers
2k
views
Should I select components based on peak current, RMS current, or average current?
I am designing a SEPIC supply around an LT3757. The MOSFET will have ~6.5A pulses with a strange ramping pattern (see image), but the RMS current is only 3.38A and the average current is 2.60A. ...
- 32.2k
-2
votes
3
answers
1k
views
Using a digital potentiometer with a SMPS?
Is it possible to use a digital potentiometer with an SMPS, to adjust the voltage? I'm looking at one with a 2 MHz -3dB bandwidth. What does this mean for a 300 kHz switcher?
- 32.2k
2
votes
1
answer
528
views
Critique my SMPS buck design, take 2
After getting some helpful critiques from my original post;
Critique my SMPS buck design
I worked on my design and made a few major changes.
L1: 3.3uH 2A inductor
C1: 10uF 25V ceramic cap
C2: 0....
- 32.2k
18
votes
1
answer
17k
views
How important is self-resonant frequency for an inductor when used in a fast (~3MHz) buck SMPS?
I'm using the LM2734Z, a 3 MHz buck regulator. It's really fast which means it has a small inductor.
One of the things I'm wondering is how important is the self-resonant frequency of the inductor? I'...
- 32.2k
8
votes
3
answers
1k
views
Critique my SMPS buck design
I'm using an LM2734 buck regulator to get +3.3V at 400mA. The datasheet is unclear on how to lay out the supply, so I tried to follow some common sense, keeping all power traces short where possible. ...
- 32.2k
5
votes
5
answers
26k
views
How much current do you require in Arduino and embedded systems projects?
How much current do you require in Arduino/Sanguino or other embedded
systems projects?
After responding to the LM2575 inductor question I started to take
a closer look at the TI power DC-DC ...
- 11.8k
8
votes
3
answers
2k
views
DC boost for low voltage?
I have a project where I'd like to convert a 0.5 V, 800 mA supply (a solar cell) to at least 3 V with as much efficiency as possible. I've seen DC boost converters, but all the ones I've seen are ...
- 1,632