How do you size an inductor for a buck converter?

When selecting an inductor for a buck converter the following parameters need to be defined:

1. Maximum input voltage = Vin max.
2. Minimum input voltage = Vin min.
3. Maximum output current = Iout max.
4. Operating frequency = f.
5. Output voltage = Vout.
6. Minimum output current = Iout min.

How do you choose a capacitor for a buck converter?

The input capacitance should be greater than 4.43 µF as calculated with Equation 1. Taking 10\% tolerance into consideration, the total effective capacitance should be greater than 4.92 µF with 12-V DC bias.

How to select the inductor value of a boost converter?

Traditionally, the inductor value of a boost converter is selected through the inductor current ripple. The average input current IL(DC_MAX)of the inductor is calculated using Equation 1. Then the inductance can be calculated using Equation 2. It is suggested that the ∆IL(P-P)should be 20\%~40\% of IL(DC_MAX) [1-2]. (1)

How to choose an inductor for a capacitor?

In general, it’s easier to choose the inductor you want then size the output capacitance in terms of ripple voltage; make sure the combined ESR gives you the ripple you want, and that the caps are rated appropriately for the ripple current and frequency that the inductor will be providing.

How to check the buck-boost of an inverting inverter?

For the inverting buck-boost this means the maximum duty cycle Dpresent at the minimum input voltage. It is specified as: (1) Rearranging Equation 1 provides theDC conversion ratio VO/ VI: (2) 2 Check the Internal Switch S1 In the first step it is important to evaluate if the internal switch S1 can withstand the output current

What is the current trough the inductor and capacitor?

The current trough the inductor is \\$I_L\\$, the voltage over the inductor is \\$V_L\\$. The voltage over the load (the resistor) and capacitor is \\$V_{out}\\$. The upper state is called the on state and the bottom state is called the off state.