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LM723 데이터시트(PDF) 11 Page - STMicroelectronics

부품명 LM723
상세설명  High precision voltage regulator
PDF  21 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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LM723 데이터시트(HTML) 11 Page - STMicroelectronics

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LM723
Typical performance characteristics
11/21
Table 6.
Resistor values (k
Ω) for standard output voltages
Output
Voltage
Applicable figures
Fixed output ± 5%
Output adjustable ± 10% (1)
R1
R2
R1
P1
R2
+3
16, 18, 20, 21, 24, 26
4.12
3.01
1.8
0.5
1.2
+5
16, 18, 20, 21, 24, 26
2.15
4.99
0.75
0.5
2.2
+6
16, 18, 20, 21, 24, 26
1.15
6.04
0.5
0.5
2.7
+9
17, 18, 20, 21, 24, 26
1.87
7.15
0.75
1
2.7
+12
17, 18, 20, 21, 24, 26
4.87
7.15
2
1
3
+15
17, 18, 20, 21, 24, 26
7.87
7.15
3.3
1
3
+28
17, 18, 20, 21, 24, 26
21
7.15
5.6
1
2
+45
22
3.57
48.7
2.2
10
39
+75
22
3.57
78.7
2.2
10
68
+100
22
3.57
102
2.2
10
91
+250
22
3.57
255
2.2
10
240
-6 (2)
18
3.57
2.43
1.2
0.5
0.75
-9
18
3.48
5.36
1.2
0.5
2
-12
18
3.57
8.45
1.2
0.5
3.3
-15
18
3.65
11.5
1.2
0.5
4.3
-28
18
3.57
24.3
1.2
0.5
10
-45
23
3.57
21.2
2.2
10
33
-100
23
3.57
97.6
2.2
10
91
-250
23
3.57
249
2.2
10
240
1.
Replace R1/R2 divider with the circuit of Figure 27.
2.
V+ must be connected to a +3 V or greater supply.
Table 7.
Formula for intermediate output voltages
Conditions
Outputs from 2 to 7V
Figure 16, 19, 20, 21, 24, 26
VO=(VREFxR2) /(R1+R2)
Outputs from 4 to 250V
Figure 22
VO=(VREF/2)x[ (R2-R1)/R1]; R3=R4
Current Limit
ILIMIT=VSENSE/RSC
Outputs from 7 to 37V
Figure 17, 19, 20, 21, 24, 26
VO=VREFx[ (R1+R2)/R2]
Outputs from -6 to -250V
Figure 18, Figure 23
VO=(VREF/2)x[ (R1+R2)/R1];
R3=R4
Foldback Current Limiting
IKNEE=[(VOxR3)/(RSCxR4)] x[ VSENSEx(R3+R4)]
/ (RSCxR4)
ISHORTCKT=(VSENSE/RSC)x[ (R3+R4)/R4]



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