LM3411-L Datasheet, PDF (12/31 Pages) Texas Instruments – Precision Secondary Regulator and Driver

LM3411-L
SNVSAX5 – JUNE 2017
Functional Block Diagrams (continued)
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Bandgap
Reference
trim
Q5
Q1
Q2
R2
130 k
R3
69 k
R4
25.5 k
R5
20 k
Q7
R6
10 k
R7
R1
45 k
30.75 k
COMP.
Q4
Q3
Q6
Q8
Q14
R12
Q12
Q13 _{110 k}
R10 R11
51 k 60 k
C1
8p
Q15
Q19
Q20
C3
3p
C2
5p
Q16
Q22
Q11
Q9
R9
40 k
R14
Q17 ^{66 k}
Q18
Q21
Q24
Q23
R_f
R8
Q10
6k
R13
3.3 k
D1
R15
1k
GND
OUT
Copyright © 2017, Texas Instruments Incorporated
Figure 18. Detailed Schematic
8.3 Feature Description
The LM3411-L device contain an internal operational amplifier, precision reference, feedback resister divider, and
a bi-polar transistor suitable for driving an optocoupler. The divider resistor is sized such that the system will
regulate the +IN pin to either 3.3 V or 5 V depending on the device version used. By connecting a feedback
network from the OUT pin to the COMP pin, local compensation is implemented to stabilize the system.
8.4 Device Functional Modes
The primary mode of operation for the LM3411-L is as a shunt regulator. In addition the device has robust
overcurrent protection. These features make it applicable to a wide range of applications ranging from isolated
feedback control to traditional shunt regulation.
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