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how to select inductor value for smps circuit?



The selection of the inductor value for a switch-mode power supply (SMPS) circuit depends on several factors, including the desired output voltage, output current, switching frequency, and ripple current. Here are some general guidelines to follow when selecting an inductor value for an SMPS circuit:

Determine the desired output voltage and output current: The inductor value will depend on the desired output voltage and current of the SMPS circuit. The output voltage and current will determine the minimum inductor value required to meet the load requirements.





Consider the switching frequency: The switching frequency of the SMPS circuit will also affect the inductor value. Higher switching frequencies will require smaller inductors, while lower switching frequencies will require larger inductors.


Calculate the ripple current: The ripple current is the difference between the maximum and minimum current flowing through the inductor. To minimize the ripple current, a larger inductor value is generally required.


Consider the DC resistance of the inductor: The DC resistance of the inductor can affect the efficiency of the SMPS circuit. Lower DC resistance will improve the efficiency.


Consider the core saturation: The inductor should be selected to avoid core saturation during the switching cycle. Saturation will cause the inductor to lose its inductance.


Consider the physical size: The physical size of the inductor also has to be considered to fit the design constraints.

It is recommended to check the manufacturers recommended datasheet for the specific component and also simulate the circuit using simulation software.

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