SEPIC converter
***Allow 30 secs for the circuit to reach steady state***
SEPIC (Single-ended primary-inductor converter) is a type of converter that allows the output voltage to be either lower or higher than the input voltage. But unlike the inverting (buck-boost) where the output voltage has a negative sign, for the SEPIC the voltage is of positive polarity.
The coupling capacitor is critical and must be low ESR, because it carries all the power through. Voltage across the capacitor changes for every cycle, so it must be a non-polarized type also.
The voltage conversion ratio is equal to:
Vo = Vi * D / (1-D)
where D is duty cycle.
For further info and to see design formulas with component selection steps visit the blog page at:
http://j.gs/5535160/sepic-formulas
