Questions tagged [sepic]

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SEPIC converter capicitors 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_{...
2
votes
0answers
141 views

Why does my SEPIC converter output more power at higher temperatures? What are the implications of this behavior?

I have a Pololu S18V20ALV SEPIC voltage regulator board that is wired to a high-amperage 5V USB power source on the input and a DC brushless fan on the output. The output is set to about 5.5V. ...
1
vote
0answers
139 views

How to limit starting current of a SEPIC based LED driver?

I have designed a SEPIC based LED driver which gives 60 V, 350 mA constant output with a good power factor. It is connected with 220 V AC source.Then I have used full-wave rectifier.After ...
1
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0answers
141 views

SEPIC converter working in BURST mode without having one

I designed a SEPIC using the LT3467 with coupled inductors. It supply 17V starting from a 12V input. On the simulator (LTSPICE) everything works, but on the test board there is a problem. With 70mA ...
1
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0answers
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DC/DC Converter MOSFET switching

I am currently building a SEPIC converter. The signal arriving from the MOSFET driver to the MOSFET seems all good, however the Vds doesn't seem to follow the drivers signal and it makes the MOSFET ...
1
vote
0answers
387 views

SEPIC converter current waveform question

I am designing a SEPIC converter, powered by 3.7 V Li-Ion cell. Frequency 500kHz, Transformer 10uH per side, 1:1 ratio. Ferrite material #87. Output to be variable by adjusting duty cycle. It has ...
0
votes
1answer
58 views

Selecting capacitor for SEPIC converter

I'm looking for an advice how to select capacitors for my SEPIC converter. I have done calculations, but I haven't find Cin, Cs and Cout yet. What seems like a problem is that there are few work ...
0
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0answers
54 views

sepic converter using lm3478

Is it possible to make a sepic converter of 120 W using LM3478 ? I am trying to make the circuit in TI web bench but it is not supporting over 12V 3A in LM3478.
0
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0answers
59 views

building real simulation in multisim(NI company) of dc-dc SEPIC convertor

hi I am trying to build real simulationin multisim of dc-dc SEPIC convertor how ever in my output voltage i get a lot of RIPPLE . the problem is that I get a lot of spikes in my capacitor current . ...
0
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0answers
55 views

High voltage drop over output diode sepic converter

I made a SEPIC converter please see the wiki for the scematic: https://en.wikipedia.org/wiki/Single-ended_primary-inductor_converter Observation: The output is 12V 2A max. When I use a scope I see ...