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DC-DC Buck Converter Critical Inductance & Conduction Mode (CCM / DCM) Calculator

Easily calculate and compute dc-dc buck converter critical inductance & conduction mode (ccm / dcm) calculator with accurate equations, live formulas, and expert guidance.

Calculated Result
24.7 μH

Critical Inductance (L_crit)

Critical Inductance (L_crit)

24.7 μH

Critical Inductance Micro H

24.7

Recommended Inductor Micro H

164.9

Nominal Duty Cycle

0.208

Operating Mode Guarantee

Inductance >= 25 μH guarantees CCM operation down to 0.8 A load

24.7 — μH

Calculation Breakdown

  1. Applied FormulaSizes DC-DC switch-mode buck converter power inductors determining the critical boundary inductance ($L_{\text{crit}}$) required to prevent discontinuous conduction mode (DCM).L_{\text{crit}} = \frac{(1 - D) R_{\max}}{2 f_{\text{sw}}} = \frac{(V_{\text{in}} - V_{\text{out}}) V_{\text{out}}}{2 I_{\min} V_{\text{in}} f_{\text{sw}}}

Buck Critical Inductance Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.06.2121925Critical Inductance (L_crit)

What Is the DC-DC Buck Converter Critical Inductance & Conduction Mode (CCM / DCM) Calculator?

This tool computes dc-dc buck converter critical inductance & conduction mode (ccm / dcm) calculator with high precision arithmetic.

How Does the DC-DC Buck Converter Critical Inductance & Conduction Mode (CCM / DCM) Calculator Work?

Sizes DC-DC switch-mode buck converter power inductors determining the critical boundary inductance (LcritL_{\text{crit}}) required to prevent discontinuous conduction mode (DCM).

DC-DC Buck Converter Critical Inductance & Conduction Mode (CCM / DCM) Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

Lcrit=(1−D)Rmax⁡2fsw=(Vin−Vout)Vout2Imin⁡VinfswL_{\text{crit}} = \frac{(1 - D) R_{\max}}{2 f_{\text{sw}}} = \frac{(V_{\text{in}} - V_{\text{out}}) V_{\text{out}}}{2 I_{\min} V_{\text{in}} f_{\text{sw}}}

Sizes DC-DC switch-mode buck converter power inductors determining the critical boundary inductance (LcritL_{\text{crit}}) required to prevent discontinuous conduction mode (DCM).

How to Use the DC-DC Buck Converter Critical Inductance & Conduction Mode (CCM / DCM) Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

DC-DC Buck Converter Critical Inductance & Conduction Mode (CCM / DCM) Calculator Example

Input Values:

inputVoltageVolts:24
outputVoltageVolts:5
switchingFrequencyKhz:100
minimumLoadCurrentAmps:0.8
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required μH.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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