Manufacturers of high-current chip inductors and integrated chip inductors have been researching and developing in this field for many years, and now I will share my experience with you!

1. The advantages of high-current chip inductors: good divergence, high reliability, and excellent magnetic performance stability and temperature stability: there are unique characteristics that any other soft magnetic materials do not have in the consumer process. It has good shape controllability and performance controllability.

1. What is the material of the high-current chip inductor package?

  The four-point packaging method can basically know that it is compared to the full package; after the tolerance and matching of the magnetic core and the magnetic ring are assembled; the magnetic ring is square when designing the magnetic ring inductance coil; and the magnetic core is circular; visible The combination of these two groups of materials produces a gap together; this gap must be packaged by the packaging materials; due to the small gap of the CKO73 series, it can be completed by sealing the four corners of the square magnetic ring; the magnetic coverage of the chip power inductor of.

Because the appearance of the four-point package is relatively short of the full package; therefore, the SMD power inductor of the full package structure is extended.

The so-called full encapsulation means that except for the four corners to be sealed; the remote part of the magnetic core must also be encapsulated; this way, the structure of the full package has a stronger overall sense; and the magnetic coverage is not much different from the effect of the four-point package; One more process will be added in the process; quite speaking, the cost is slightly higher; however, the full package inductors are more popular in the market; therefore, when choosing the cost investment, many businesses choose four-point package chip power inductors; the original components It is a built-in object; in fact, the importance of aesthetics is not the first.

High current chip inductor

2. What are the main parameters of high current chip inductor packaging?

Some common parameters of high current chip inductors:

  1. Inductance: The property of the inductor, the smaller the ripple, the better the energy storage effect, and the greater the inductance; but the greater the inductance, the larger the request size, and the increase in its DCR, the more the partial pressure will affect Power supply; when the inductance is small, the energy storage and filtering effect will deteriorate. So choosing a power inductor is to separate many aspects and stop thinking.

  2. Equivalent DC Resistance (DCR): The resistance value of the power inductor when passing through a DC current is related to the materials used in the inductor winding, operating frequency, and its own temperature, and affects IRMS.

  3. Self-resonant frequency (SRF): The resonant frequency F0 of the parallel resonant circuit composed of the inductance of the chip inductor and the scattered capacitance. When this F0 is exceeded, the inductance will behave as a capacitive effect. Below this F0, the inductance will behave as an inductance effect (impedance increases with increasing frequency).

  4. Inductance tolerance: The actual inductance is related to the allowable tolerance of the nominal inductance.

  5. Rated current (IDC): There are two resolutions for the rated current of power inductors: "rated current based on the improvement of its own temperature" and "rated current based on the rate of change of inductance", which have important meanings respectively.