Ron Koo is a corporate applications engineer with the Maxim Integrated Products video group, Sunnyvale, Calif. He received a BS and MS in electrical engineering and computer science from the Massachusetts Institute of Technology, Cambridge, Mass. Email address: rk@design.maxim.com Web site: http://www.maxim-ic.com
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May 22, 2008[Ideas For Design] Simple Circuit Uses FET To Protect Car's Video Driver From Overvoltage
In a typical automotive video application, the video digital-to-analog converter (DAC)—from a rear camera or DVD player, for example—is followed by a low-pass reconstruction filter and an amplifier that transmits a video signal to the LCD. This amplifier, and all such similar automotive circuits, must be protected from direct connection to the car’s battery voltage. Since these voltages range from 12 to 16 V, the minimum protection required is 16...
