ADM1030
http://onsemi.com
18
is the highest sample rate; 11.25 kHz. The ramp rate is set to
8 which would correspond to the fastest ramp rate. With
these settings it took approximately 12 seconds to go from
0% duty cycle to 100% duty cycle (full-speed). The
T
MIN
value = 32癈 and the T
RANGE
= 80癈. It can be seen
that even though the temperature increased very rapidly, the
fan gradually ramps up to full speed.
Figure 29. Filtered Mode with Ramp Rate = 8
TIME (s)
0
12
0
20
40
60
80
100
120
0
20
40
60
80
100
120
140
PWM DUTY CYCLE
R
TEMP
Figure 30 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.
Figure 30. Filtered Mode with Ramp Rate = 4
TIME (s)
0
22
0
20
40
60
80
100
140
0
20
40
60
80
100
120
PWM DUTY CYCLE
R
TEMP
120
Figure 31 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.
Figure 31. Filtered Mode with Ramp Rate = 2
TIME (s)
0
54
0
20
40
60
80
100
120
0
20
40
60
80
100
120
140
PWM DUTY CYCLE
R
TEMP
Finally, Figure 32 shows how the control loop reacts to
temperature 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.
Figure 32. Filtered Mode with Ramp Rate = 1
TIME (s)
0
112
0
20
40
60
80
100
140
0
20
40
60
80
100
120
PWM DUTY CYCLE
R
TEMP
120
As can be seen from Figures 29 through 32, 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 33 shows the behavior of the PWM output as
temperature 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
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相关PDF资料
ADM1032ARZ-REEL
IC TEMP MONITOR 85DEG 8SOIC
ADM1033ARQZ-RL7
IC THERM/FAN SPEED CTLR 16-QSOP
ADM1034ARQZ-REEL
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ADN8810ACPZ-REEL7
IC CURRENT SOURCE(12BIT) 24LFCSP
ADP2140ACPZ3328R7
IC REG DL BCK/LINEAR 10LFCSP
ADP5022ACBZ-6-R7
IC REG TRPL BCK/LINEAR 16WLCSP
ADP5041ACPZ-1-R7
IC REG TRPL BCK/LINEAR 20-LFCSP
ADP5042ACPZ-2-R7
IC REG TRPL BCK/LINEAR 20LFCSP
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