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ADM1031 Datasheet(PDF) 17 Page - Analog Devices

Part # ADM1031
Description  Intelligent Temperature Monitor and Dual PWM Fan Controller
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM1031 Datasheet(HTML) 17 Page - Analog Devices

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ADM1031
–17–
TIME – s
012
140
80
40
60
20
0
80
60
40
20
0
120
120
100
100
RTEMP
PWM DUTY CYCLE
Figure 13. Filtered Mode with Ramp Rate = 8
Figure 14 shows how changing the ramp rate from 8 to 4 affects
the control loop. The overall response of the fan is slower. Since
the ramp rate is reduced, it takes longer for the fan to achieve full
running speed. In this case, it took approximately 22 seconds for
the fan to reach full speed.
TIME – s
022
120
80
40
60
20
0
140
80
60
40
20
0
110
120
100
RTEMP
PWM DUTY CYCLE
Figure 14. Filtered Mode with Ramp Rate = 4
Figure 15 shows the PWM output response for a ramp rate of
2. In this instance the fan took about 54 seconds to reach full
running speed.
80
60
40
20
0
120
100
TIME – s
054
140
80
40
60
20
0
120
100
RTEMP
PWM DUTY CYCLE
Figure 15. Filtered Mode with Ramp Rate = 2
Finally, Figure 16 shows how the control loop reacts to tem-
perature with the slowest ramp rate. The ramp rate is set to 1,
while all other control parameters remain the same. With the
slowest ramp rate selected it took 112 seconds for the fan to
reach full speed.
TIME – s
0
112
120
80
40
60
20
0
140
80
60
40
20
0
110
120
100
RTEMP
PWM DUTY CYCLE
Figure 16. Filtered Mode with Ramp Rate = 1
As can be seen from Figures 13 through 16, the rate at which
the fan will react to temperature change is dependent on the
ramp rate selected in the Fan Filter Register. The higher the
ramp rate, the faster the fan will reach the newly calculated
fan speed.
Figure 17 shows the behavior of the PWM output as tempera-
ture varies. As the temperature is rising, the fan speed will ramp
up. Small drops in temperature will not affect the ramp-up
function since the newly calculated fan speed will still be higher
than the previous PWM value. The Filtered Mode allows the
PWM output to be made less sensitive to temperature varia-
tions. This will be dependent on the ramp rate selected and
the ADC sample rate programmed into the Fan Filter Register.
90
90
TIME – s
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
00
RTEMP
PWM DUTY CYCLE
Figure 17. How Fan Reacts to Temperature Variation in
Filtered Mode



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