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Free DC-DC Boost Converter Inductor Calculator Electronics & Robotics
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Free DC-DC Boost Converter Inductor Calculator

Calculate minimum inductance, average & peak inductor currents, switch duty cycle, and output filter capacitance for step-up switch-mode converters.

🔋 Boost Operating Parameters

e.g. 3.7V Li-Ion, 12V battery
Must be > Vin
Typical: 400 - 1500 kHz
Standard: 20% - 40%

📊 Sizing & Component Specifications

Required Inductance (L) 0.00 μH Nearest std: --
Peak Inductor Current (Ipeak) 0.00 A Min Isat rating: 0.00 A
Duty Cycle (D) 0.0% Mode: CCM
Average Inductor Current 0.00 A Ripple ΔIL: 0.00 A

Output Capacitor & Rectifier Diode

Min Output Capacitance (Cout) 0.0 μF
Max Capacitor ESR 0.0 mΩ
Rectifier Diode: Schottky rated for ≥ Vout × 1.25 and average current ≥ Iout.

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Frequently Asked Questions

What is the formula for boost converter duty cycle?

The ideal boost converter duty cycle formula is: D = 1 - (Vin × Efficiency / Vout). As output voltage increases relative to input voltage, the duty cycle increases.

Why does a boost converter inductor carry more current than the output current?

By conservation of energy (Pin ≈ Pout), if output voltage is higher than input voltage, input current must be proportionally higher (Iin ≈ Iout × Vout / Vin). Because the inductor is on the input side, it must conduct this full average input current.

Can a boost converter produce an output voltage lower than the input voltage?

No. In a conventional non-isolated boost topology, a physical diode connects the input inductor directly to the output. If Vin exceeds the target Vout, current flows uncontrolled through the inductor and diode straight to the load without regulation.

What type of diode should be used in an asynchronous boost converter?

Always use a fast-recovery Schottky diode with low forward voltage drop (Vf ≤ 0.4V) and reverse voltage breakdown rating at least 25% higher than the maximum output voltage.