Boost calculations
1. Minimum needed inductance
2. Check for continuous or discontinuous mode
3. On- and off-time
4. Voltages and currents on components
5. General calculations
1. Minimum needed inductance
The calculation is done with the minimum input voltage to achieve the desired current ripple in continuous conduction mode.
Peak-to-peak inductor current ripple

Minimum needed inductance at minimum input voltage

2. Check for continuous or discontinuous mode
It has to be checked if the boost converter is working in continuous or discontinuous mode to use the proper formulas.
Maximum input current

Current ripple with choosen indcutance

Check for continuous or discontinuous mode
3. On- and off-time
Depending on the mode (continuous or discontinuous) different formulas are needed.
ton - FET is in on-state (continuous and discontinuous mode)
- Inductor current is rising
toff - FET is in off-state (continuous and discontinuous mode)
- Inductor current is falling
tzero - time slot when inductor current is zero
- occurs only in discontinuous conduction mode
Duty cycle

On-time is continuous conduction mode

Off-time in continuous condcution mode

On-time is discontinuous conduction mode

Off-time in discontinuous condcution mode

Time slot when inductor current is zero (only in discontinuous condcution mode)

4. Voltages and currents on components
Depending on the mode (continuous or discontinuous) different formulas are needed.
Minimum current in continuous conduction mode (FET, diode, inductor)

Maximum current in continuous conduction mode (FET, diode, inductor)

Minimum current in discontinuous conduction mode (FET, diode, inductor)

Maximum current in discontinuous conduction mode (FET, diode, inductor)

4.1 FET specific calculations
Average FET current

RMS FET current

Minimum FET voltage

Maximum FET voltage

FET voltage in discontinuous conduction mode when the inductor current is zero

4.2 Diode specific calculations
Average diode current

RMS diode current

Minimum diode voltage

Maximum diode voltage

Diode voltage in discontinuous conduction mode when the inductor current is zero

4.3 Inductor specific calculations
Average inductor current

RMS inductor current

Minimum inductor voltage

Maximum inductor voltage

Diode voltage in discontinuous conduction mode when the inductor current is zero

5. General calculations
Diode losses

Output power

Input power

Input current
