TIDUF18A October 2022 – February 2024
The inductor plays important role in affecting system efficiency, current ripple, and overall size. It is always a balance between the efficiency and the power density. The inductance value is calculated based on the input voltage, output voltage, and worst case ripple.
The duty cycle is calculated as:
Calculation of the current ripple into inductor can be distinguished into three periods:
In the worst cases, the equation becomes:
This design targets at achieving 10% current ripple at maximum input power and maximum AC current:
where,
As a result, the inductance is calculated as 126 µH at 12 A RMS current.