In mobile devices such as smartphones, protection devices such as chip varistors are used to prevent malfunction or damage to the circuit due to electrostatic discharge (ESD), but the noise suppression sheet from TDK known as "Flexield" IFL series (abbreviated simply to "Flexield" below) is a product which is also effective in suppression of electrostatic discharge. Use case and its effectiveness are presented in the article.
With electronic devices such as smartphones and tablets becoming increasingly more compact, thinner, and multi-functional, a large number of electronic components are mounted on the circuit board with high density, and therefore, suppression of noise emitted by the ICs and cables is becoming increasingly important. Since it is difficult to estimate this noise emission at the design stage, there are an increasing number of cases in which measures must be taken to suppress noise in the manufacturing stage. "Flexield", which is the noise suppression sheet from TDK (referred to simply as Flexield below) is a magnetic shielding material made by mixing finely powdered soft magnetic metal (flat powder) with plastic, and processing it into a flexible sheet. Main features and applications of "Flexield" are shown in this article.
Flexield is a simple and effective solution for the problem of "self-poisoning" which is an EMC problem in electronic devices. Use case of the noise suppression sheet "Flexield" from TDK, and its effectiveness in compact electronic devices are presented in the article.
The new N95 ferrite material from EPCOS significantly reduces power transformer losses in switch-mode power supplies. Their efficiency can be greatly increased, especially when operating under no load or fractional load.
The article is the part of a guidebook “TDK EMC TECHNOLOGY-GUIDEBOOK FOR EMC” providing an easy-to-understand explanation of the base principles of soft ferrite material structure. Key characteristics of ferrite materials and ferrite cores using for a variety of noise countermeasures are shown.
Low Voltage Differential Signaling (LVDS) is the most common differential transmission system, and it is used for many devices that require high-speed transmission because of its general-purpose properties. As mention is another chapter, USB 2.0 and DVI, HDMI, and DisplayPort are external interfaces that are used to connect devices. However, LVDS is used as an internal interface for many devices for connecting baseplates. This can be used for various purposes and is therefore used by many devices. This section will discuss issues related to EMC which can occur with LVDS, along will solutions using displays as examples such as TVs and monitors.
Even if an electronic device is designed taking noise into consideration, taking into consideration element locations, the ground or filtering on a PCB, it might generate a high level of noise or become susceptible to noise when it is connected to another device with an interface cable.
Apart from miniaturization, improved efficiency is the most important development goal in the design of power supply units. Every tenth of a percent counts. Apart from the power semiconductors, ferrite cores are the decisive factor for efficiency. TDK has developed a new ferrite material and improved geometries for the core designs.
This article represents the most frequently asked questions (FAQ) on TDK (Epcos) ferrite cores characteristics and fields of application.