DSF050J394

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Film Capacitors

Film capacitors, also known as plastic film capacitors, polyester capacitors, mylar capacitors, and metallized polyester capacitors, are components made from closely stacked layers of thin mylar film sandwiched between two metallic plates. This construction process enables them to store electrical energy and provide electric current flow.

DSF050J394 Application Field and Working Principle

The DSF050J394 is a high-grade film capacitor manufactured by Samsung, designed for use in a variety of power applications. It features low Equivalent Series Resistance (ESR) and high insulation resistance with temperature coefficient of capacitance, enabling superior performance in high-reliability applications such as LED lighting, LED backlighting, LCD displays, etc.

The DSF050J394 is a metallized film capacitor with a temperature coefficient of capacitance of -20 ppm/°C. Its construction features one layer of oxide-coated polyester (PET) film with embedded metal electrodes across the two conductor plates bonded together. This process gives the capacitor its desired electrical properties, such as low ESR, low dissipation factor, and high insulation resistance, making it an ideal choice for power application.

The working principle behind the DSF050J394 film capacitor is that electrical energy is stored in the capacitor due to its dielectric layer. When a voltage is applied to the capacitor, a static electric field builds up between the two metals in the capacitors in proportion to the amount of voltage applied. This leads to an alteration in the molecule structure of the dielectric material, which enables the formation of an electrical charge on the surface of the dielectric.

Thus, when a voltage is applied to the DSF050J394 film capacitor, electrical energy is stored and discharged whenever the input voltage is lower than the stored voltage. This process is known as dielectric absorption. In some cases, dielectric absorption can also lead to a leakage of the stored energy, which can be combatted by using a capacitor with a low ESR.

Due to its low ESR and high insulation resistance, the DSF050J394 film capacitor is highly reliable and can be used in a wide range of applications, such as lighting, backlighting, LCD displays, HVAC, etc. It is capable of handling input voltages of up to 250V and can withstand temperature ranges of -40°C to +105°C, making it an optimal choice for those operating in extreme temperatures.

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