What are the precautions for the selection of chip inductors?

In the selection of chip power inductors, in addition to knowing the voltage, capacitance and size of the chip power inductors, if you can know some of the selection items, you may avoid some unnecessary mistakes. Next, I will tell you Let's learn the precautions for the selection of SMD power inductors together.

1. It is necessary to choose the original type of SMD power inductors as much as possible, if the parameters are not to be changed anymore.

2. The large capacitance deviation of individual patch power inductors will not significantly affect the abnormal operation of the circuit, so it may be replaced by a capacitor with a slightly larger or smaller capacitance.

The I-shaped inductor is generally composed of a magnetic core or iron core, a skeleton, a winding group, a shielding cover, and packaging materials. Common-mode inductors are also called common-mode chokes, which are often used in computer switching power supplies to filter common-mode electromagnetic interference signals. In the board design, the common mode inductance also plays the role of EMI filtering, which is used to suppress the electromagnetic wave generated by the high-speed signal line from radiating to the outside. However, deviations cannot be used in the frequency divider circuit, oscillating circuit and delay circuit. These requested capacitance values should be as consistent as possible with the calculation request, and the error should be less than 0.3~0.5.

3. The selected withstand voltage value should be equal to or greater than the original value.

4. When selecting SMD power inductors, it is best to use high temperature resistant capacitors. The maximum working temperature of high temperature resistant capacitors is 105℃. When it works under the premise of maximum working temperature, it can guarantee about 2000 hours of abnormal working time. When using a capacitor of 80°C at 50°C, its lifespan can reach 22,000 hours. If a high-temperature chip power inductor is used at this time, its lifespan can reach up to 90,000 hours. 5. To select the voltage, multiply the actual circuit working voltage by 1.5 times, and basically select the nearest general voltage upwards here. The I-shaped inductor is generally composed of a magnetic core or iron core, a skeleton, a winding group, a shielding cover, and packaging materials. For example, if the circuit is 5V, the withstand voltage is 7.5V after derating. The final choice is the rated voltage of 10V.

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