Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [sepic]

For questions about single-ended primary-inductor converters (SEPICs), which are a type of DC/DC converter. Use with the "dc-dc-converter" tag.

For questions about single-ended primary-inductor converters (SEPICs), which are a type of DC/DC converter. See Wikipedia's SEPIC article for more information.

Use with .

47 questions
13
votes
7 answers

What do phase dots on an inductor mean?

I have a SEPIC supply with coupled inductors. The inductors have phase dots. What do these "phase dots" mean? Is it important to have the phase dot in the same place?
Thomas O
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11
votes
2 answers

How do I size the coupling capacitance for a SEPIC converter?

The app notes I've seen for a SEPIC converter1 all tell me to size the coupling capacitor for ripple currents and voltages. I haven't seen one that tells me how to size the capacitance. Obviously there's some minimum; zero capacitance means no…
Stephen Collings
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9
votes
4 answers

Can I use a common mode choke as a coupled inductor in a SEPIC converter

I do not really understand the difference between common mode chokes and coupled inductors. They are both 2 coils wrap around the same core but I know they have different purposes. I want to design a SEPIC converter with a coupled inductor but it…
Sonia
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6
votes
1 answer

Vin: 2-36, Vout: 4.2. Should I use step-up, followed by step-down, or SEPIC?

My application has a small device, which draws about a watt, and is powered through a small dynamo, backed by a battery: The dynamo generates 33 volts at maximum speed, close to L6902's max input voltage, and I can draw up to 800 mA from it. A…
anrieff
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5
votes
4 answers

Coupled inductor vs an actual transformer?

What is the difference between a coupled inductor and an actual transformer? The LT3757 datasheet mentions that I need a coupled inductor for the SEPIC to work
Thomas O
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5
votes
3 answers

Isolated DC/DC flyback/SEPIC

As far as I understand the flyback topology, it can be used in both buck and boost converters. What I am not sure about is: Does it also work for the case where buck-boost is needed, i.e. \$V_{\text{in,min}} \leq V_{\text{out}} \leq…
Junius
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4
votes
1 answer

Is there a problem using electrolytic (polarized) capacitor as coupling capacitor in SEPIC converter?

I found this circuit from here and have been thinking about to build it: The author present it as Ćuk converter but I understand it as SEPIC, after reading this and this. Q: My main concern is, whether it is safe to use electrolytic capacitor for…
Junaid
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4
votes
2 answers

Switching supply burning mosfets, what is happening?

I have been working on a SEPIC converter for an electronic cigarette power supply. This application involves using two 3.7v INR batteries in parallel, rated for an appropriately high current discharge, to power the converter and drive a kanthal…
eenoob
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3
votes
2 answers

12V @ 1A from a 6V to 20V input

I have a 6V to 20V input I want to convert to 12V at 1 amp maximum continuous current. The output must be the same polarity as the input, so that pretty much means a SEPIC is the only way to go... However, I've been looking around and all solutions…
Thomas O
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3
votes
4 answers

13-48 V SEPIC - > 19.5 Vout; 0.5 A

I am trying to design a SEPIC converter with the parameters stated above and have already drawn a schematic using the LM5022 IC. I have built the system and noticed a few things: The output voltage is a stable 19.66 V with an open circuit load,…
Yordan Aleksandrov
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3
votes
2 answers

SEPIC vs Cuk vs Zeta Converter

My understanding is that SEPICs, Cuks, and Zeta converters all provide a stable output voltage despite an input voltage that can vary either above or below what is desired. The SEPIC and Zeta maintains the same polarity, while the Cuk reverses the…
CraigC
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3
votes
1 answer

SEPIC converter capacitors calculation

I have got a SEPIC converter design see here: http://www.linear.com/docs/27994 The calculation of the SEPIC converter starts at page 21. For the input capacitance on page 17 they tell you need: \$I_{RMS}(C_{IN}) = 0.3 \cdot ∆I_L \$ This is a current…
Want2Know
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2
votes
1 answer

Ceramic output capacitor selection for ripple current (SEPIC)

I'm designing a SEPIC converter based on a wide input voltage range SMPS controller (LTC3758). The requirement is for a wide input voltage (10-60V) with a fixed output of 28V @ 1.5A. I'm trying to determine Cout selection which per the data sheet,…
Alex Turner
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2
votes
1 answer

Lossless Resistor model in PSpice?

Is it possible to make a lossless resistor model in spice? I want to test the large signal model of my DCM SEPIC converter (without linearizing it). OrCad's PSpice library doesn't seem to have it, but is it possible to make a model somehow? The…
Filip Cvejic
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2
votes
1 answer

Sepic based charger

I have acquired a LT1512 Sepic based controller which is a controller for charging purposes. I have followed the datasheet as much as can, read few articles on how to set it up for my purposes, charging SLA battery. Very few information found, some…
mnemonic
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