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LM3411AM5-5.0 Folha de dados(PDF) 1 Page - National Semiconductor (TI) |
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LM3411AM5-5.0 Folha de dados(HTML) 1 Page - National Semiconductor (TI) |
1 / 13 page LM3411 Precision Secondary Regulator/Driver General Description The LM3411 is a low power fixed-voltage (3.3V or 5.0V) pre- cision shunt regulator designed specifically for driving an op- toisolator to provide feedback isolation in a switching regula- tor. The LM3411 circuitry includes an internally compensated op amp, a bandgap reference, NPN output transistor, and volt- age setting resistors. A trimmed precision bandgap reference with temperature drift curvature correction, provides a guaranteed 1% preci- sion over the operating temperature range (A grade version). The amplifier’s inverting input is externally accessible for loop frequency compensation when used as part of a larger servo system. 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 criti- cal applications. Although its main application is to provide a precision output voltage (no trimming required) and maintain very good regu- lation 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 temperature coefficient n Available in 5-lead SOT23-5 surface mount package (tape and reel) Applications n Secondary controller for isolated DC/DC PWM switching regulators systems n Use with LDO regulator for high-precision fixed output regulators n Precision monitoring applications n Use with many types of regulators to increase precision and improve performance Typical Application and Functional Diagram SIMPLE SWITCHER™ is a tradmark of National Semiconductor Corporation. DS011987-1 Basic Isolated DC/DC Converter DS011987-2 LM3411 Functional Diagram December 1999 © 1999 National Semiconductor Corporation DS011987 www.national.com |
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