LM723 データシートの表示（PDF） - STMicroelectronics
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LM723 Datasheet PDF : 15 Pages
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LM723
TABLE 1: Resistor Values (KΩ) for standard Output Voltages
Output
Voltage
Applicable Figures
Fixed Output ± 5%
R1
R2
+3
13, 16, 17, 18, 21, 23
4.12
3.01
+5
13, 16, 17, 18, 21, 23
2.15
4.99
+6
13, 16, 17, 18, 21, 23
1.15
6.04
+9
14, 16, 17, 18, 21, 23
1.87
7.15
+12
14, 16, 17, 18, 21, 23
4.87
7.15
+15
14, 16, 17, 18, 21, 23
7.87
7.15
+28
14, 16, 17, 18, 21, 23
21
7.15
+45
19
3.57
48.7
+75
19
3.57
78.7
+100
19
3.57
102
+250
19
3.57
255
-6**
15
3.57
2.43
-9
15
3.48
5.36
-12
15
3.57
8.45
-15
15
3.65
11.5
-28
15
3.57
24.3
-45
20
3.57
21.2
-100
20
3.57
97.6
-250
20
3.57
249
* Replace R1/R2 divider with the circuit of fig. 24.
** V+ must be connected to a +3V or greater supply.
Output Adjustable ± 10% *
R1
P1
R2
1.8
0.5
1.2
0.75
0.5
2.2
0.5
0.5
2.7
0.75
1
2.7
2
1
3
3.3
1
3
5.6
1
2
2.2
10
39
2.2
10
68
2.2
10
91
2.2
10
240
1.2
0.5
0.75
1.2
0.5
2
1.2
0.5
3.3
1.2
0.5
4.3
1.2
0.5
10
2.2
10
33
2.2
10
91
2.2
10
240
TABLE 2: Formula for Intermediate Output Voltages
Outputs from 2 to 7V
Fig. 13, 16, 17, 18, 21, 23
VO=(VREFxR2)/(R1+R2)
Outputs from 7 to 37V
Fig. 14, 16, 17, 18, 21, 23
VO=VREFx[(R1+R2)/R2]
Outputs from 4 to 250V
Fig. 19
VO=(VREF/2)x[(R2-R1)/R1]; R3=R4
Outputs from -6 to -250V
Fig. 15, 20
VO=(VREF/2)x[(R1+R2)/R1]; R3=R4
Current Limit
ILIMIT=VSENSE/RSC
Foldback Current Limiting
IKNEE=[(VOxR3)/(RSCxR4)]x[VSENSEx(R3+R4)]/
(RSCxR4)
ISHORTCKT=(VSENSE/RSC)x[(R3+R4)/R4]
7/16
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