The circuit is composed of wires and electronic components. The parameters of the chip inductors required by different circuits are different. The main parameters of the chip inductors are inductance, allowable deviation, distributed capacitance, rated current and quality factor.
Inductance
The amount of inductance depends mainly on the number of turns of the inductor (number of turns), the winding method, the presence or absence of the core and the material of the core. In general, the more coil turns, the denser the wound coil and the greater the inductance. A coil with a core has a larger inductance than a coil without a core. The larger the magnetic permeability of the core, the larger the inductance. So the inductance is there are many factors to determine its size. The basic unit of inductance is Henry (referred to as Henry), which is indicated by the letter "H". Commonly used units are millihenry (mH) and microhenry (μH), and the relationship between them is: 1H=1000mH; 1mH=1000μH
2. Allowable deviation
The allowable error value of the labeled sense and the actual sense. Generally, the chip inductor used in the oscillation or filter circuit requires high precision, and the allowable deviation is ±0.2%~±0.5%. The accuracy requirement for coupling or high-frequency choke is not high, and the allowable deviation is ±10%~ 15%.
3. Distributed capacitance
The capacitance between the turns of the coil and between the coil and the core. The smaller the distributed capacitance, the better its stability.
4. Rated current
The maximum current that the chip inductor is allowed to pass during normal operation. If the operating current exceeds the rated current, it will burn out.
5. Quality factor
Also known as Q or excellent value, it is the main parameter to measure the quality of the inductor. He refers to the ratio of the inductive reactance exhibited by the chip inductor to its equivalent loss resistance when operating at an AC voltage of a certain frequency. The higher the Q value, the smaller the loss and the higher the efficiency.
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