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LM3411-L Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce LM3411-L
Description  Precision Secondary Regulator and Driver
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM3411-L Fiches technique(HTML) 11 Page - Texas Instruments

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+
±
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
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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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