LM723_07 datasheet(11/21 Pages) STMICROELECTRONICS

Part #	LM723

Description	High precision voltage regulator

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Manufacturer	STMICROELECTRONICS [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

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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