LM3411-L Datasheet, PDF (20/31 Pages) Texas Instruments – Precision Secondary Regulator and Driver

LM3411-L
SNVSAX5 – JUNE 2017
Typical Applications (continued)
9.2.7 3.3-V, 0.5-A Low Dropout Regulator
+VIN
D41D5
3.3 k
Output + 3.3 V
500 mA
0.1 µF
6.2 k
(2)
1N4148
2N2222 _{(+) IN}
+
OUT
51
LM3411-L ^COMP.
3.3
1 nF
( - ) GND
47 µF
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Figure 28. 3.3-V, 0.5-A Low Dropout Regulator Schematic
9.2.7.1 Design Requirements
The design requirements for this low dropout linear regulator example are 3.3 V and 0.5 A.
9.2.7.2 Detailed Design Procedure
The circuit in Figure 28 shows a 3.3-V low dropout regulator using the LM3411-3.3 and several discrete
components. This circuit is capable of excellent performance with both the dropout voltage and the ground pin
current specifications improved over the LM2941 and LM3411-L circuit.
9.2.8 Precision Positive Voltage Regulator With Accurate Current Limit
Input
Voltage
+VIN
9 V ± 20 V
+
47 µF
LM317
VOUT ^RS
240
ADJ.
2N3904
100
Output
Voltage _{+5 V}
1.25
62 k
300 pF
ICL = _{R S}
(+) IN
OUT _{LM3411-L COMP.}
-5.0
+
1 µF
2k
( - ) GND
Copyright © 2017, Texas Instruments Incorporated
Figure 29. Precision Positive Voltage Regulator With Accurate Current Limit Schematic
9.2.8.1 Design Requirements
The design requirements for this precision positive voltage regulator with accurate current limit are V_IN = 9 V to
20 V and V_OUT = 5 V.
9.2.8.2 Detailed Design Procedure
The standard LM317 three terminal adjustable regulator circuit can greatly benefit by adding a LM3411-L.
Performance is increased and features are added. Figure 29 shows a circuit capable of providing further
improved line and load regulation, lower temperature drift, and full remote output voltage sensing on both the
high and low side. In addition, a precise current limit or constant current feature is simple to add.
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