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LM3411 Datasheet PDF

National Semiconductor LM3411

The LM3411 is a low power fixed-voltage (3.3V or 5.0V) precision shunt regulator designed specifically for driving an optoisolator to provide feedback isolation in a switching regulator. The LM3411 circuitry includes an internally compensated op amp, a bandgap reference, NPN output transistor, and voltage setting resistors. The amplifier’s inverting input is externally accessible for loop frequency compensation when used as part of a larger servo system.
Part No. LM3411
Datasheet LM3411 Download
Manufacturer
National Semiconductor
Description Precision Secondary Regulator/Driver
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LM3411 datasheet page 1 preview

GENERAL DESCRIPTION

A trimmed precision bandgap reference with temperature drift curvature correction, provides a guaranteed 1% precision over the operating temperature range (A grade version). The output is an open-emitter NPN transistor capable of driving up to 15 mA of load current. Because of its small die size, the LM3411 has been made available in the sub-miniature 5-lead SOT23-5 surface mount package. This package is ideal for use in space critical applications. Although its main application is to provide a precision output voltage (no trimming required) and maintain very good regulation in isolated DC/DC converters, it can also be used with other types of voltage regulators or power semiconductors to provide a precision output voltage without precision resistors or trimming.

FEATURES

n Fixed voltages of 3.3V and 5.0V with initial tolerance of ± 1% for standard grade and ± 0.5% for A grade n Custom voltages available (3V–17V) n Wide output current range, 20 µA–15 mA n Low temper...
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