How do you select an inductor for a DC DC converter?

How do you select an inductor for a DC DC 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 an inductor?

An inductor should have a high value of rated current so that it can operate in linear range over the entire load. Also, it should have low DC resistance to minimize losses and increase the efficiency of the regulator. It should also have a small size which is important for printed circuit boards (PCBs).

What size inductor do I need?

To get a good compromise between inductor and capacitor size, you should choose a ripple current value of 10% to 30% of maximum load current. This also implies that the current in the inductor will be continuous for output currents greater that 5% to 15% of full load.

Can inductor be used in DC circuits?

The inductor is a passive circuit. It will act as a short circuit when direct current is applied across the inductor. The inductor works on the principle of changing electric flux.

What is the difference between inductor and capacitor?

One of the main differences between a capacitor and an inductor is that a capacitor opposes a change in voltage while an inductor opposes a change in the current. Furthermore, the inductor stores energy in the form of a magnetic field, and the capacitor stores energy in the form of an electric field.

What are common inductor values?

Inductors have values that typically range from 1 µH (10−6 H) to 20 H. Many inductors have a magnetic core made of iron or ferrite inside the coil, which serves to increase the magnetic field and thus the inductance.

Are not used in DC circuit?

Mercury motor meters and commutator motor meter are used on DC circuit. In mercury motor meter the speed of motor is directly proportional to the circuit current.

Why use an inductor instead of a capacitor?

A capacitor stores energy in an electric field; an inductor stores energy in a magnetic field. If an inductive circuit is disconnected from a power supply, the inductor will temporarily maintain current. Another way of saying this is that capacitors “resist” changes in voltage and inductors “resist” changes in current.

How are inductors used in DC-DC converters?

The ‘buck’ DC-DC converter is employed to step voltages down without isolation and utilizes an inductor as an energy storage element. This article will explain how to choose the correct inductor for optimum performance.

How to choose the right inductor for DC-DC Buck applications?

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 More

Which is the best part number for an inductor?

An optimum inductor can be chosen using TT Electronics (TT) inductor datasheets. In this example, TT part number HA72L-06308R2LFTR is suggested, which is automotive grade, -55 ºC to +155 ºC (AEC-Q200 certified) with the electrical parameters below:

How to choose an inductor for a boost converter?

You must define or calculate the following parameters when selecting an inductor for a Boost Converter; (the values at right side of the equal signs are given for calculation purpose only). This design example focuses on the “discontinuous mode”.