This circuit was designed to supply 5 V at up to 1 A for microprocessor circuits in the electrically noisy environment of vehicles. It can cope with most of the transients found on 12 V vehicle supply lines. The input is protected from noise and fast transients by an input filter which also filters noise that would otherwise be fed back on to the line.
Automotive regulator for microprocessor supplies
Spannungsregler in Kraftfahrzeugen fuer die Stromversorgung von Mikroprozessoren
Electronic Engineering, London ; 53 , 655 ; 25
1981
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Microprocessor-Controlled Digital Shunt Regulator
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