Lm340 Series Voltage Regulators - the lm340 and lm7805 family monolithic 3 terminal positive voltage regulators employ internal current limiting thermal shutdown and safe area pensation making them essentially indestructible switching voltage regulators all of the voltage regulators we have discussed so far are series regulators also sometimes called the linear regulators because the pass transistor used in such a regulator operates in the active region ic voltage regulators circuit diagram block diagram of linear fixed adjustable positive negative switching voltage regulators nomenclature and packaging for ics within the 78xx family the xx is replaced with two digits indicating the output voltage for ex le the 7805 has a 5 volt output while the 7812 produces 12 volts the following is a list of lm series integrated circuits many were among the first analog integrated circuits mercially produced some were groundbreaking innovations.

and many are still being used the lm series originated with integrated circuits made by national semiconductor op based linear regulators experienced audio diyers are familiar with monolithic linear regulators like the 78xx series and the lm317 here s a simplified block diagram of a standard linear regulator from national semiconductor s application note 1148 a voltage regulator takes an unregulated input voltage and converts it to the exact regulated voltage an electronic circuit requires voltage regulators are used in almost every electronic circuit and the popular 7805 has been used everywhere from puters to satellites from dvd player and video games to arduinos and robots





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