LM78S40 Switching Voltage Regulator
A D.C. power supply is usually regulated by some type of feedback circuit that senses any change in the D.C. output and develops a control signal to compensate for this change. This feedback maintains an essentially constant output. In a monolithic regulator, the output voltage is sampled and a high-gain differential amplifier compares a portion of this voltage with a reference voltage.
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Read more source:
http://www.national.com/an/AN/AN-711.pdf
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