Buck converter inductor ripple

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Reading the datasheet I found this calculation: It shows inductor ripple of mA with given values. EDIT: Added layout and explained application more. So this is my schematic for this buck: The filament voltage was rated 0. Willy Wonka. Willy Wonka Willy Wonka 6 6 silver badges 18 18 bronze badges.

Add a comment. Active Oldest Votes. Adam Lawrence Adam Lawrence So, the inductor DC current will be 10A as well. If you already have basic knowledge in buck converter principles and want to start doing your own design, the article Buck Converter Design Tutorial is perfect for you. Both equations will give the same answer. Skip to content Search for:. Buck Converter. July 7, July 7, mr. Buck Converter Inductor Ripple Current Derivation To derive the ripple current, you must use either the linear ramping up or linear ramping down of the inductor current waveform.

Related Posts Buck Converter. Linux Mac. People Also Search. Inductor Waveform. Boost Smps Circuit. Continuous Conduction. Flyback Converter Waveforms. Boost Converter Design. Interleaved Converter. Capacitor Waveform. DC Boost Converter. Boost Converter Diagram. Boost Converter Output Waveforms. For a fixed inductor, the higher the input voltage, the higher ripple factor is. For a fixed input voltage, ripple factor is higher when the inductance is less.

Higher ripple factor means more ripple current flows though capacitor. If same ripple voltage is required, bigger capacitor is necessary. As described above, the inductor will store energy during switch turn-on period, and release energy while switch turns off.

Conceptually, the load current should pass through the inductor, such that enough area of winding wire is necessary. If lower ripple factor or higher inductance is designed, more winding turns is necessary, which leads to bigger size of inductor. An index for measuring the inductor size called Area Product is introduced, which is the product of effective cross-section area of the core and area of winding window. The unit becomes m 4 rather than m 3 in volume.

However, the area product is directly proportional to core volume. A C is the effective cross-section area of core. Figure 3 shows the normalized core size vs. When ripple factor is in low area, core size will be dramatically increased and almost flat in high ripple factor. That means there exists an optimal range in near knee area. Basically, high ripple factor results in big filtering capacitor and vice versa. A buck converter with kHz switching frequency has the following operating parameters,.

Assuming the power switch and freewheeling diode are ideal. Inductance m H.