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LM25085 Switching Regulator Design Calculator

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Inductor Current and Maximum Power Calculator
V
µH
A
Please enter all required values.
RESULTS
Ton Max
F Min
P Max
Energy at Saturation

Input Parameters Specification

Voltage Across InductorThe applied voltage across the inductor winding that controls current ramp speed in switching power circuits.
InductanceThe coil inductance in microhenry used to calculate current rise time and stored magnetic energy.
Saturation CurrentThe maximum inductor current before the magnetic core starts saturating and inductance drops.
Power Electronics UseUseful for buck, boost, flyback, pulse inductor, SMPS and current ramp estimation.

Practical Operational Examples

Switching Inductor Check

Enter supply voltage, inductance and saturation current to estimate maximum safe ON time before the core reaches saturation.

SMPS Power Estimate

The maximum power value helps compare inductor capability in DC-DC converters, pulse drivers and energy storage circuits.

Diagrams & Theory

When voltage is applied across an inductor, current rises linearly. The inductor reaches saturation at Isat, and the stored energy depends on inductance and current squared.

Inductor Current Ramp and Saturation V across L L Inductor stores energy Isat limit Current rises Saturation I t Energy = I² × L / 2 E I

Formulas & Mathematical Logic

Step 1: Convert inductance from µH to H: L(H) = L(µH) / 1000000.
Step 2: Maximum ON time: Tonmax = Isat × L / V.
Step 3: Minimum frequency: Fmin = 1 / (2 × Tonmax).
Step 4: Maximum power: Pmax = V × Isat / sqrt(6).
Step 5: Saturation energy: Esat = Isat × Isat × L / 2.
Step 6: Tonmax is displayed in µs, Fmin in kHz, Pmax in W and Esat in µJ.

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About this tool

LM25085 Switching Regulator Design Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.