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SEPIC converter design

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Peter05

Student
Joined
Sep 5, 2021
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2
Location
GR
Hello,

i would like to design a SEPIC conveerter with input voltage ranging from 3Volts to 19 Volts . On its output will be connected three DC-DC converters ( 1 boost and 2 buck converters , their image is attached) and the output voltage of the SEPIC should be araound 8.4V.Could you help me with the design ?

Thank you.
buck1_yhkadz.png
buck2_xq4qyk.png
boost_pu02ot.png
overall_eymmm4.png
 
What's stopping you from using one of the myriad of available chips and following their datasheets? Unless you're truly trying to do something different, the datasheets have pretty much everything you need to know to build up a basic converter. The fact that you're hooking up multiple converters the the output of the SEPIC only matters in terms of how much input capacitance they have (i.e., how much output capacitance the SEPIC sees).

Dan - Owner
Footwell%20Animation%20Tiny.gif
 
My first try is this circuit :
cir_jn4t76.png

But my circuit presents a strange response.
For pw =4.8u the response on the output is this (about 6.5V):
before_tai0e0.png

and the response for greater pw(e.g. 5u) is like this :
after_ombvwr.png

Both far away from ~8.4V.
 
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