參數(shù)資料
型號: AMD1027
廠商: Analog Devices, Inc.
英文描述: dBCOOL Remote Thermal Controller and Voltage Monitor
中文描述: dBCOOL遠程熱控制器和電壓監(jiān)視器
文件頁數(shù): 32/56頁
文件大?。?/td> 1072K
代理商: AMD1027
REV. A
–32–
ADM1027
Step 5
Determine T
RANGE
for Each Temperature Channel
T
RANGE
is the range of temperature over which automatic fan
control occurs once the programmed T
MIN
temperature has
been exceeded. T
RANGE
is actually a temperature slope and not
an arbitrary value, i.e., a T
RANGE
of 40
C only holds true for
PWM
MIN
= 33%. If PWM
MIN
is increased or decreased, the
effective T
RANGE
is changed, as described later.
TEMPERATURE
T
MIN
100%
PWM
MIN
0%
P
T
RANGE
Figure 32. T
RANGE
Parameter Affects Cooling Slope
The T
RANGE
or fan control slope is determined by the following
procedure:
1. Determine the maximum operating temperature for that
channel, e.g., 70
C.
2. Determine experimentally the fan speed (PWM duty cycle
value) will not exceed that temperature at the worst-case
operating points, e.g., 70
C is reached when the fans are
running at 50% PWM duty cycle.
3. Determine the slope of the required control loop to meet
these requirements.
4. Use best fit approximation to determine the most suitable
T
RANGE
value. There is ADM1027 evaluation software avail-
able to calculate the best fit value; ask your local Analog
Devices representative for more details.
T
MIN
100%
33%
0%
P
50%
30 C
40 C
Figure 33. Adjusting PWM
MIN
Affects T
RANGE
T
RANGE
is implemented as a slope, which means as PWM
MIN
is
changed, T
RANGE
changes, but the actual slope remains the
same. The higher the PWM
MIN
value, the smaller the effective
T
RANGE
will be, i.e., the fan will reach full speed (100%) at a
lower temperature.
T
MIN
100%
33%
25%
0%
P
50%
30 C
40 C
45 C
10%
54 C
Figure 34. Increasing PWM
MIN
Changes Effective T
RANGE
For a given T
RANGE
value, the temperature at which the fan
will run full-speed for different PWM
MIN
values can easily be
calculated:
T
where:
T
MAX
= Temperature at which the fan runs full-speed
T
MIN
= Temperature at which the fan will turn on
MaxD.C.
= Maximum duty cycle (100%) = 255 decimal
MinD.C.
= PWM
MIN
T
RANGE
= PWM duty cycle versus temperature slope
T
MaxD.C.
MinD.C.
T
MAX
MIN
RANGE
=
+
-
(
)
170
Example:
Calculate
T
MAX
,
given
T
MIN
= 30
C,
T
RANGE
= 40
C,
and PWM
MIN
= 10% duty cycle = 26 decimal
T
T
T
T
MAX
= 84
C
(
effective
T
RANGE
= 54
C
)
T
30
30
MaxD. .
100
%
-
255
MinD. .
)
C
40
T
MAX
MAX
=
MAX
=
MIN
RANGE
=
+
+
+
-
%
(
(
(
)
170
-
10
26
C
170
170
C
C
40
)
Example:
Calculate
T
MAX
,
given
T
MIN
= 30
C,
T
RANGE
= 40
C
and PWM
MIN
= 25% duty cycle = 64 decimal
T
T
T
T
MAX
= 75
C
(
effective T
RANGE
= 45
C
)
T
30
30
MaxD. .
100
%
-
255
MinD. .
)
C
40
T
MAX
MAX
=
MAX
=
MIN
RANGE
=
+
+
+
-
%
(
(
(
)
170
-
64
C
170
170
C
C
25
)
40
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