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Simple IC protects automotive video drivers from overvoltage

Posted: 19 Jan 2011 ?? ?Print Version ?Bookmark and Share

Keywords:video amplifiers? LCD display? lowpass reconstruction filter?

This circuit illustrated in this application note protects automotive video amplifiers from accidental exposure to the car's battery voltage (16V maximum), by sensing voltage faults and quickly opening the connection between amplifier and battery.

In a typical automotive video application, the video DAC (from a rear camera or DVD player, for example) is followed by a lowpass reconstruction filter and an amplifier that transmits a video signal to the LCD display. This amplifier and all such similar automotive circuits must be protected from direct connection to the car's battery voltage. Since car battery voltages range from 12V to 16V, the minimum protection required is 16V.

View the PDF document for more information.

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