Class-D amplifiers, which are used in devices such as smartphones and audio equipment, have the advantages of being compact and highly efficient, but crucially require countermeasures against noise generated by their high-speed switching. TDK has an extensive lineup of products which can provide effective noise countermeasures while ensuring high sound quality and without affecting signals. This article describes the applications and effectiveness of these products in speaker lines for various devices which use Class-D amplifiers.

Ob einfache Gadgets oder komplexe industrielle IoT-Geräte – eine platzsparende, zuverlässige wie auch äußerst sichere Stromversorgung benötigen sie alle. CeraCharge™, der weltweit erste Solid-State-Akkumulator in SMD-Technologie erfüllt alle diese Ansprüche.

Leistungsstarke Lasten sind beim Einschalten für Sicherungen und Bauelemente ein großer Stressfaktor, da hierbei sehr hohe Ströme fließen. Um diese zu vermeiden, bietet TDK keramische EPCOS Einschaltstrom-Begrenzer auf der Basis von NTC- und PTC-Thermistoren, die auch kombiniert eingesetzt werden können.

Here are S-parameters where products in the ALT series and common mode filters/chokes are combined in the recommended ways for use with 1000BASE-T.

TDK has an extensive lineup of inrush current limiting NTC thermistors available. This article describes various example applications of these products, used for ICL (inrush current limiting) purposes to easily and effectively suppress inrush current.

Varistors can be used as suppressors to protect devices and circuits from transient abnormal voltages including an ESD (electrostatic discharge) and a lightning surge. For protection from a relatively large surge current (100A to 25kA), leaded disk varistors and SMD disk varistors are suitable. For protection from a larger surge current (approximately 25kA or more), block varistors, and strap varistors are suitable.

SMD or chip varistors are voltage-dependent resistors based on ceramic multilayer technology. They are widely used to protect electronic circuits in consumer devices and telecom, industrial and automotive applications against transient overvoltages, such as electrostatic discharges (ESD) and surge transients.

Chip varistors have both surge absorption capabilities and noise suppressing effects.

TDK’s chip varistors in the AVR series, which are made with our own materials, feature high resistance to repeated surges. Products that substitute Zener diodes in compact devices such as solenoid valves and stepping motors, which are rapidly and frequently turned on and off, are also available.

NTC thermistors are heat-sensitive resistor elements of which resistance values rapidly decrease with rise of temperature. With this property, they are used as temperature protection devices for protecting circuits from overheating as well as temperature sensors.