# Minimum Inductance Calculator

Critical inductance Lc is the minimum value of inductance at which inductor current reaches zero. This calculator calculates the Minimum Inductance of a Step Down Converter.

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### Result

• Minimum Inductance
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Inductance critical Lc is the lowest inductance value at which the inductor current is zero. As a result, it is the most critical condition for operating a buck converter in discontinues mode. In other words, the inductor value is set to be less than the critical inductance for running the buck converter in discontinuous mode.

The minimum % load is used to determine the requirement. The alternative option is to establish the requirement by the previously stated maximum difference between the maximum and minimum current in the inductor. For continuous operation, this is twice the average load current. The inductor value is more than critical inductance while operating a buck converter in CCM mode.

L < Lc for operating buck converter in DCM

L > 1.05Lc for operating buck converter in CCM

Critical inductance Lc is the minimum value of inductance at which inductor current reaches zero. This calculator calculates the Minimum Inductance of a Step Up Converter.

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### Result

• Minimum Inductance
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A boost converter is a dc-dc step-up converter. The boost converter will be constructed with pulse width modulation and a MOSFET as the switching device. As a Buck converter, a MOSFET is turned on and off for the appropriate duration, which is controlled by a 555 timer circuit. The following is the relationship between input and output voltages:

Critical inductance Lc is the minimum value of inductance at which inductor current reaches zero. This calculator calculates the Minimum Inductance of a Buck Boost Converter.

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### Result

• Minimum Inductance
H

Minimum Inductance - The peak to peak variation in current during the on and off time is referred to as inductor current ripple. The difference in inductor current during the high side MOSFET Q1 on time is equivalent to the difference during the MOSFET's off period for the synchronous buck converter.