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LM3411-L Datasheet(PDF) 11 Page - Texas Instruments |
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LM3411-L Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page + ± GND OUT COMP. ( ) + ( ) - 1.23 V + Rf, 52 k for 3.3 V 94 k for 5 V IN 31 k Rf Copyright © 2017, Texas Instruments Incorporated 11 LM3411-L www.ti.com SNVSAX5 – JUNE 2017 Product Folder Links: LM3411-L Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The LM3411-L is a shunt regulator specifically designed to be the reference and control section in an overall feedback loop of a regulated power supply. The regulated output voltage is sensed between the IN pin and GROUND pin of the LM3411-L. If the voltage at the IN pin is less than the LM3411-L regulating voltage (VREG), the OUT pin sources no current. As the voltage at the IN pin approaches the VREG voltage, the OUT pin begins sourcing current. This current is then used to drive a feedback device, (optocoupler) or a power device (linear regulator, switching regulator, and so forth) which serves the output voltage to be the same value as VREG. In some applications (even under normal operating conditions), the voltage on the IN pin can be forced above the VREG voltage. In these instances, the maximum voltage applied to the IN pin should not exceed 20 V. In addition, an external resistor may be required on the OUT pin to limit the maximum current to 20 mA. 8.2 Functional Block Diagrams Figure 17. LM3411-L Functional Diagram |
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