LM3822 datasheet(10/12 Pages) NSC

Part #	LM3822

Description	Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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10 / 12 page

Look-Up Tables

The following tables show how to convert the duty cycle of

the PWM output to a current value, and vice versa. The

quantization error of 1⁄2 bit is not shown in these tables.

Please see the “PWM Output and Current Accuracy” section

for more details.

TABLE 1. Current to Duty Cycle Conversion Table

Sense Current

(Imax = 1.0A)

Sense Current

(Imax = 2.0A)

Duty Cycle (%)

95.5

0.95

1.90

93.2

0.90

1.80

90.9

0.85

1.70

88.6

0.80

1.60

86.4

0.75

1.50

84.1

0.70

1.40

81.8

0.65

1.30

79.5

0.60

1.20

77.3

0.55

1.10

75.0

0.50

72.7

0.45

0.90

70.5

0.40

0.80

68.2

0.35

0.70

65.9

0.30

0.60

63.6

0.25

0.50

61.4

0.20

0.40

59.1

0.15

0.30

56.8

0.10

0.20

54.5

0.05

0.10

52.3

0.00

−0.05

−0.10

47.7

−0.10

−0.20

45.5

−0.15

−0.30

43.2

−0.20

−0.40

40.9

−0.25

−0.50

38.6

−0.30

−0.60

36.4

−0.35

−0.70

34.1

−0.40

−0.80

31.8

−0.45

−0.90

29.5

−0.50

−1

27.3

−0.55

−1.10

−0.60

−1.20

22.7

−0.65

−1.30

20.5

−0.70

−1.40

18.2

−0.75

−1.50

15.9

−0.80

−1.60

13.6

−0.85

−1.70

11.4

−0.90

−1.80

9.1

−0.95

−1.90

6.8

−1

−2

4.5

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