Boost Converter Calculator
Output
About Boost Converter Calculator
The Boost Converter Calculator determines two important design parameters for an ideal boost converter.
-
Duty Cycle (D): In an ideal boost converter the relationship is given by
\[V_{out} = \frac{V_{in}}{1-D} \quad\Longrightarrow\quad D = 1 – \frac{V_{in}}{V_{out}}\] (expressed as a percentage). -
Inductance (L): The inductor is selected to limit the ripple current (\(I_{ripple}\)) and is calculated by
\[L = \frac{V_{in} \times D}{I_{ripple} \times f_{sw}}\] (where all values are first converted into SI base units).
Important: For a boost converter the output voltage must be greater than the input voltage. If not, an error message will be shown.
Example Calculation
Example
- Vin = 5 V
- Vout = 12 V
- fsw = 100 kHz
- Iripple = 500 mA
Duty Cycle:
\[D = 1 – \frac{5}{12} \approx 0.5833 \quad\text{or}\quad 58.33\%\]
Inductance:
Using \( D \approx 0.5833 \),
\[L = \frac{5\,V \times 0.5833}{0.5\,A \times (100\times10^{3}\,Hz)} \approx \frac{2.9165}{50\,000} \approx 5.83\times10^{-5}\,H\] which is about 58.3 µH.