If we have a solar panel of 5V and we want to keep voltage on the output to 3V, what current we are getting on the output? The same as in the input? Or a different one?
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The output power of the DC-DC converter is equal to the input power multiplied by converter efficiency. I assumed your DC-DC converter has an efficiency off 80%.
\$P_{out} = P_{in} \cdot 80\% \$
\$ 3I_{out} = 5I_{in} \cdot 0.8 \$
\$I_{out} = 1.33I_{in}\$
But not always. You get the maximum current that is supported by the converter. If that limit is reached, then this equation is not true anymore.
answered May 25, 2014 at 17:21