11 kW OBC Reference Design
A three-phase On Board Charger (OBC) platform achieving state-of-the-art system efficiency with AEC-Q SiC power devices and drivers.Learn More
The portfolio of Video Amplifiers from onsemi includes a variety of single and multi-channel standard definition (SD) and high definition (HD) video amplifiers. They are compatible with most Digital-to-Analog Converters (DAC) embedded in video processors. Applications include Video Systems (NTSC, PAL, and SECAM), Home Theatre, Floppy Disk Head Amplifier, Pulse Amplifier in Communications, and Magnetic Memory. Typical end products utilizing onsemi Video Amplifiers include Digital Still Cameras, Smart Phones, Set-Top Boxes, DVD Players, Blu-Ray Players, Flat Panel TVs, and Digital Video Recorders. The portfolio also includes AEC-Q101 Qualified and PPAP Capable options specifically engineered and qualified for automotive industry applications.
In this two parts application note illustrating the power saving features on the new generation of video drivers, we will continue with the output load detection explanation. It’s costly and difficult for the chipset to detect the presence of a TV on the RCA connectors dedicated to the analog video channels, especially when the output of the video drivers need to be AC coupled. This load detection feature presented, answers the need by integrating the load detection into the video driver.
Consumer electronic applications have always been demanding in terms of space and cost reductions. In addition to these two requirements, power saving has become increasingly important in every system with the recent changes in ENERGY STAR® standards. These considerations constituted the main focus for the next video driver generation offered by onsemi.
Video amplifiers are typically used to drive 75 Ω coaxial cables through an AC coupling capacitor. Unfortunately, in order to maintain the quality of the video signal this output capacitor must be made extremely large. However, as portable applications become more compact there are greater size restrictions to meet. A solution is a method called SAG correction, also known as SAG compensation, which is used in AC coupled video applications to allow a smaller output capacitor.