LM723 datasheet(7/15 Pages) STMICROELECTRONICS

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LM723

7/16

TABLE 1: Resistor Values (K

Ω) for standard Output Voltages

* Replace R1/R2 divider with the circuit of fig. 24.

** V+ must be connected to a +3V or greater supply.

TABLE 2: Formula for Intermediate Output Voltages

Output

Voltage

Applicable Figures

Fixed Output ± 5%

Output Adjustable ± 10% *

13, 16, 17, 18, 21, 23

4.12

3.01

1.8

0.5

1.2

13, 16, 17, 18, 21, 23

2.15

4.99

0.75

0.5

2.2

13, 16, 17, 18, 21, 23

1.15

6.04

0.5

2.7

14, 16, 17, 18, 21, 23

1.87

7.15

0.75

2.7

+12

14, 16, 17, 18, 21, 23

4.87

7.15

+15

14, 16, 17, 18, 21, 23

7.87

7.15

3.3

+28

14, 16, 17, 18, 21, 23

7.15

5.6

+45

3.57

48.7

2.2

+75

3.57

78.7

2.2

+100

3.57

102

2.2

+250

3.57

255

2.2

240

-6**

3.57

2.43

1.2

0.5

0.75

-9

3.48

5.36

1.2

0.5

-12

3.57

8.45

1.2

0.5

3.3

-15

3.65

11.5

1.2

0.5

4.3

-28

3.57

24.3

1.2

0.5

-45

3.57

21.2

2.2

-100

3.57

97.6

2.2

-250

3.57

249

2.2

240

Outputs from 2 to 7V

Fig. 13, 16, 17, 18, 21, 23

VO=(VREFxR2)/(R1+R2)

Outputs from 4 to 250V

Fig. 19

VO=(VREF/2)x[(R2-R1)/R1]; R3=R4

Current Limit

ILIMIT=VSENSE/RSC

Outputs from 7 to 37V

Fig. 14, 16, 17, 18, 21, 23

VO=VREFx[(R1+R2)/R2]

Outputs from -6 to -250V

Fig. 15, 20

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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