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AN-103 LM340 Series Three Terminal Positive Regulators

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The LM340-XX are three terminal 1.0A positive voltage regulators, with preset output voltages of 5.0V or 15V. The LM340 regulators are complete 3-terminal regulators requiring no external components for normal operation. However, by adding a few parts, one may improve the transient response, provide for a variable output voltage, or increase the output current. Included on the chip are all of the functional blocks required of a high stability voltage regulator; these appear in Figure 1.