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| 型號： | ADM1027ARQZ-RL7 |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 32/56頁 |
| 文件大?。?/td> | 1822K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 產(chǎn)品變化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 Product Obsolescence 30/Sept/2009 |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | dBCool® |
| 功能： | 風(fēng)扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | 0°C ~ 105°C，外部傳感器 |
| 精確度： | ±1°C |
| 拓?fù)洌?/td> | ADC，比較器，風(fēng)扇速度計數(shù)器，多路復(fù)用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 無 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-QSOP |
| 包裝： | 帶卷 (TR) |
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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 40rC 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%
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., 70rC.
2. Determine experimentally the fan speed (PWM duty cycle
value) will not exceed that temperature at the worst-case
operating points, e.g., 70rC 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%
50%
30C
40C
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%
0%
50%
30C
40C
25%
10%
45C
54C
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
T
MaxD.C. MinD.C. T
MAX
MIN
RANGE
=
+
-
(
)
?/DIV>
170
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
Example: Calculate T
MAX
, given T
MIN
= 30rC, T
RANGE
= 40rC,
and PWM
MIN
= 10% duty cycle = 26 decimal
T
T
MaxD C
MinD C
T
MAX
MIN
RANGE
=
+
-
(
)
?/DIV>
. .
. .
170
T
C
C
MAX
= r +
-
(
)
?nbsp r
30
100
10
40
170
%
%
T
C
C
MAX
= r +
-
(
)
?nbsp r
30
255 26 40
170
T
MAX
= 84rC (effective T
RANGE
= 54rC)
Example: Calculate T
MAX
, given T
MIN
= 30rC, T
RANGE
= 40rC
and PWM
MIN
= 25% duty cycle = 64 decimal
T
T
MaxD C
MinD C
T
MAX
MIN
RANGE
=
+
-
(
)
?/DIV>
. .
. .
170
T
C
C
MAX
= r +
-
(
)
?nbsp r
30
100
25
40
170
%
%
T
C
C
MAX
= r +
-
(
)
?nbsp r
30
255 64 40
170
T
MAX
= 75rC (effective T
RANGE
= 45rC)
Rev. 3 | Page 32 of 56 | www.onsemi.com
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| ADM1027ARQZ-RL71 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:dBCOOLa?￠ Remote Thermal Controller and Voltage Monitor |
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| ADM1028ARQ-REEL7 | 制造商:Rochester Electronics LLC 功能描述:TDM + LINEAR FAN CONTROL I.C. - Tape and Reel |
| ADM1029 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual PWM Fan Controller and Temperature Monitor for High Availability Systems |
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