MAL202139109E3

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Aluminum Electrolytic Capacitors

MAL202139109E3 Application Field and Working Principle
Aluminum electrolytic capacitors, abbreviated as AECs, are widely-used in various kinds of electronic products due to their significant advantages of small size, high capacity and preeminent performance. MAL202139109E3 is an example of aluminum electrolytic capacitors, which is particularly suitable for work demanding long-term use and high reliability under harsh environment, such as server-grade performance, personal computers, mobile devices, etc. In this paper, the application field and working principle of the MAL202139109E3 will be discussed in details.

The features of MAL202139109E3 enable it to achieve wide applications. Firstly, it can be used as a filter capacitor in a power system. Generally, it is connected with the rectifier filter to suppress the negative feedback of the switching current ripple, producing an output voltage with low ripple. Secondly, it is applicable to DC-DC converter, mainly to reduce the output voltage ripple of DC-DC converter to control the output voltage. Moreover, it can be used as a start-up connector in power amplifier, especially in occasions where required voltage increases slowly, such as for large scale integrated circuits. Lastly, it also can play a role as a decoupling capacitor. In a circuit system, high-frequency component of the current may cause a certain degree interference and lose signal integrity of the system. As a decoupling capacitor, MAL202139109E3 can prevent the interference from high-frequency component of the current and reduce signal distortion. In this way, the power supply of MCU can produce sufficient voltage to ensure signal integrity of the whole system.

The working principle of MAL202139109E3 is based on Faraday’s law. This type of capacitor consists of two aluminum foils coated with a layer of electrolytic paste. In the capacitor, one foil electrode is covered with paper impregnated with binder, and two foil electrodes with separators (the so-called electrolyte) are included between two electrodes, forming a stack of paper-separator-electrolyte-separator-paper. When a voltage is applied to MAL202139109E3, electrons are collected on the positive side of the capacitor. At this time the positive side will start to become more positively charged and the negative side will become negatively charged. This causes a charge separation, and the capacitor can now store energy in the form of an electrostatic field. The electrostatic field between the two electrodes can be calculated as E=V/d, where V is the applied voltage and d is the separation distance between the two electrodes.

To sum up, MAL202139109E3 is an improved type of aluminum electrolytic capacitors which is particularly suitable for work demanding long-term use and high reliability under harsh environment. Furthermore, it has a diversity of applications, such as power system filter, DC-DC converter, start-up connector in power amplifier and decoupling capacitor. The working principle of MAL202139109E3 is based on Faraday’s law, the electrostatic field between the two electrodes can be calculated as E=V/d.

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