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| 型號： | ADM1027ARQZ-RL7 |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 36/56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(jì)數(shù)器，多路復(fù)用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報(bào)： | 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
36
ADM1027
ENHANCING SYSTEM ACOUSTICS
Automatic fan speed control mode reacts instantaneously to
changes in temperature, i.e., the PWM duty cycle will respond
immediately to temperature change. Any impulses in tempera-
ture can cause an impulse in fan noise. For psycho-acoustic
reasons, the ADM1027 can prevent the PWM output from
reacting instantaneously to temperature changes. Enhanced
acoustic mode will control the maximum change in PWM duty
cycle in a given time. The objective is to prevent the fan cycling
up and down and annoying the system user.
Acoustic Enhancement Mode Overview
Figure 37 gives a top-level overview of the automatic fan
control circuitry on the ADM1027 and where acoustic
enhancement fits in. Acoustic enhancement is intended as a
post-design tweak when a system or mechanical engineer is
evaluating best settings for the system. Having determined the
optimal settings for the thermal solution, the engineer can adjust
the system acoustics. The goal is to implement a system that is
acoustically pleasing without causing the user annoyance due to
fan cycling. It is important to realize that although a system may
pass an acoustic noise requirement specification, e.g., 36 dB,
if the fan is annoying, it will fail the consumer test.
The Approach
There are two different approaches to implementing system
acoustic enhancement. The first method is temperature-centric.
This involves smoothing transient temperatures as they are mea-
sured by a temperature source, e.g., Remote 1 temperature.
The temperature values used to calculate PWM duty cycle
values would be smoothed, reducing fan speed variation. However,
this approach causes an inherent delay in updating fan speed
and causes the thermal characteristics of the system to change.
It also causes the system fans to stay on longer than necessary,
since the fan reaction is merely delayed. The user also has no
control over noise from different fans driven by the same tempera-
ture source. Consider controlling a CPU cooler fan (on PWM1)
and a chassis fan (on PWM2) using Remote 1 temperature.
Because the Remote 1 temperature is smoothed, both fans will
be updated at exactly the same rate. If the chassis fan is much
louder than the CPU fan, there is no way to improve its acoustics
without changing the thermal solution of the CPU cooling fan.
The second approach is fan-centric. The idea is to control the
PWM duty cycle driving the fan at a fixed rate, e.g., 6%. Each
time the PWM duty cycle is updated, it is incremented by a
fixed 6%. So the fan ramps smoothly to its newly calculated
speed. If the temperature starts to drop, the PWM duty cycle
immediately decreases by 6% every update. So the fan ramps
smoothly up or down without inherent system delay. Consider
controlling the same CPU cooler fan (on PWM1) and chassis
fan (on PWM2) using Remote 1 temperature. The T
MIN
and
T
RANGE
settings have already been defined in automatic fan
speed control mode, i.e., thermal characterization of the control
loop has been optimized. Now the chassis fan is noisier than the
CPU cooling fan. So PWM2 can be placed into acoustic
enhancement mode independent of PWM1. The acoustics of
the chassis fan can therefore be adjusted without affecting the
acoustic behavior of the CPU cooling fan, even though both
fans are being controlled by Remote 1 temperature. This is
exactly how acoustic enhancement works on the ADM1027.
ACOUSTIC
ENHANCEMENT
TACHOMETER 1
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
TACHOMETER 2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
TACHOMETERS 3
AND 4
MEASUREMENT
PWM
GENERATOR
PWM
GENERATOR
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM
CONFIG
PWM
MIN
MUX
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
TRANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
PWM
MIN
PWM
MIN
PWM
CONFIG
PWM
CONFIG
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
TACH1
CPU
FANSINK
FRONT
CHASSIS
REAR
CHASSIS
PWM3
TACH3
PWM2
TACH2
Figure 37. Acoustic Enhancement Smooths Fan Speed Variations Under Automatic Fan Speed Control
Rev. 3 | Page 36 of 56 | www.onsemi.com
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PDF描述 |
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| ADM1032ARZ-REEL | IC TEMP MONITOR 85DEG 8SOIC |
| ADM1033ARQZ-RL7 | IC THERM/FAN SPEED CTLR 16-QSOP |
| ADM1034ARQZ-REEL | IC THERM/FAN SPEED CTRLR 16-QSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1027ARQZ-RL71 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:dBCOOLa?￠ Remote Thermal Controller and Voltage Monitor |
| ADM1028 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Remote Thermal Diode Monitor with Linear Fan Control |
| ADM1028ARQ | 功能描述:IC SENSOR TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報(bào):無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| 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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