TDK Develops, Begins Mass Production Of Inverter Transformers For Liquid Crystal Display Backlights

TDK Corp. announced that it has developed and started mass production of the IVT series of high-voltage transformers for inverters used in liquid crystal display backlights.

TDK claims that the demand for liquid crystal displays used in electronic devices such as car navigation systems and notebook personal computers has grown rapidly. As displays become larger and thinner, electronic components must be mounted in increasingly limited spaces. There are calls for the high-voltage transformers that are essential for switching on liquid crystal display backlights in particular to be made smaller, thinner, and lighter. In addition, their use in portable devices such as car navigation systems is also increasing, requiring high reliability under the harsh conditions of automotive use.

To meet these needs, TDK states that it conducted fundamental reviews of manufacturing techniques including the adoption of high temperature resistant wire for winding wire and using laser welding to join the internal contacts. The result was the development of an inverter which the company claims is reliable even under demanding automobile environments.

Among the device’s main features are: a high temperature resistant wire used for the winding wire to achieve reliability under harsh automotive environments; laser welding is used for internal joins to provide high reliability; a sectionless bobbin is used to create a compact, low-profile unit; they are suitable for automatic mounters. The dimensions are 39.0 x 9.0 x 4.8mm (max.), with a leakage inductance of 150 – 300mH, and an operating temperature of -30 – 130°C (including temperature increase from self-generated heat).

The main applications are backlights for liquid crystal displays used in car navigation systems, notebook personal computers, and other electronic devices.

The sample pricing is 100 yen/unit.