LM96063 datasheet(33/46 Pages) TI2

33 / 46 page

LM96063

www.ti.com

SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013

Application Notes

FAN CONTROL DUTY CYCLE VS. REGISTER SETTINGS AND FREQUENCY

The following table is true only when the 22.5 kHz PWM frequency high resolution duty cycle is not selected.

PWM

Actual Duty

PWM

Step

Freq at

Cycle, %

Freq

Value

Resolution,

360 kHz

1.4 kHz

When

4C [5:0]

4C [5:0] for

4C [5:0]

Internal

75% is

[4:0]

for 100%

about 75%

for 50%

Clock, kHz

Clock, Hz

Selected

Address 0 is mapped to Address 1

180.0

703.1

50.0

90.00

351.6

75.0

16.7

60.00

234.4

83.3

12.5

45.00

175.8

75.0

10.0

36.00

140.6

80.0

8.33

30.00

117.2

75.0

7.14

25.71

100.4

78.6

6.25

22.50

87.9

75.0

5.56

20.00

78.1

77.8

5.00

18.00

70.3

75.0

4.54

16.36

63.9

77.27

4.16

15.00

58.6

75.00

3.85

13.85

54.1

76.92

3.57

12.86

50.2

75.00

3.33

12.00

46.9

76.67

3.13

11.25

43.9

75.00

2.94

10.59

41.4

76.47

2.78

10.00

39.1

75.00

2.63

9.47

37.0

76.32

2.50

9.00

35.2

75.00

2.38

8.57

33.5

76.19

2.27

8.18

32.0

75.00

2.17

7.82

30.6

76.09

2.08

7.50

29.3

75.00

2.00

7.20

28.1

76.00

1.92

6.92

27.0

75.00

1.85

6.67

26.0

75.93

1.79

6.42

25.1

75.00

1.72

6.21

24.2

75.86

1.67

6.00

23.4

75.00

1.61

5.81

22.7

75.81

The following table is true only when the 22.5 kHz PWM frequency with high resolution duty cycle is selected by

setting bit 4 (PHR) of the Enhanced Configuration register (0x45), clearing bit 3 (PWCKSL) of the PWM and

RPM Configuration register (0x4A) and setting PWM Frequency (0x4D) register to 0x08.

Actual Duty

PWM

Cycle, %

Step

Value

Freq at

Freq

When

Resolution,

4C [7:0]

4C [7:0] for

4C [7:0]

360 kHz

1.4 kHz

Approximately

for 100%

about 75%

for 50%

Internal

[4:0]

75% is

(Hex)

Clock, kHz

Clock, Hz

Selected

0.392

22.50

Not Available

74.902

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