- 您現在的位置：買賣IC網 > Datasheet目錄39 > ADM1027ARQZ-RL7 (ON Semiconductor)IC REMOTE THERMAL CTLR 24QSOP Datasheet資料下載
參數資料
| 型號： | ADM1027ARQZ-RL7 |
| 廠商： | ON Semiconductor |
| 文件頁數： | 38/56頁 |
| 文件大小： | 1822K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 產品變化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 Product Obsolescence 30/Sept/2009 |
| 標準包裝： | 1,000 |
| 系列： | dBCool® |
| 功能： | 風扇控制，溫度監控器 |
| 傳感器類型： | 內部和外部 |
| 感應溫度： | 0°C ~ 105°C，外部傳感器 |
| 精確度： | ±1°C |
| 拓撲： | ADC，比較器，風扇速度計數器，多路復用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 無 |
| 輸出風扇： | 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） |
| 供應商設備封裝： | 24-QSOP |
| 包裝： | 帶卷 (TR) |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁當前第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
REV. A
38
ADM1027
CHOOSING RAMP RATE FOR ACOUSTIC
ENHANCEMENT
The optimal ramp rate for acoustic enhancement can be found
through system characterization after the thermal optimization
has been finished. Each ramp rates effects should be logged, if
possible, to determine the best setting for a given solution.
Enhanced Acoustics Register 1 (Reg. 0x62)
<2:0> ACOU Select the ramp rate for PWM1.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
Enhanced Acoustics Register 2 (Reg. 0x63)
<2:0> ACOU3 Select the ramp rate for PWM3.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
<6:4> ACOU2 Select the ramp rate for PWM2.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
Another way to view the ramp rates is as the time it takes for the
PWM output to ramp from 0% to 100% duty cycle for an instan-
taneous change in temperature. This can be tested by putting
the ADM1027 into manual mode and changing the PWM output
from 0% to 100% PWM duty cycle. The PWM output takes
35 sec to reach 100% with a ramp rate of 1 time slot selected.
TIME sec
140
0
0.76
120
100
80
60
40
20
0
120
100
80
60
40
20
0
R
TEMP
(C)
POWER DUTY CYCLE (%)
Figure 40. Enhanced Acoustics Mode with Ramp Rate = 48
Figure 40 shows remote temperature plotted against PWM duty
cycle for enhanced acoustics mode. The ramp rate is set to 48,
which corresponds to the fastest ramp rate. Assume that a new
temperature reading is available every 115 ms. With these set-
tings, it took approximately 0.76 seconds to go from 33% duty
cycle to 100% duty cycle (full speed). It can be seen that even
though the temperature increased very rapidly, the fan ramps up
to full speed gradually.
Figure 41 shows how changing the ramp rate from 48 to 8
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 approxi-
mately 4.4 sec for the fan to reach full speed.
TIME sec
120
0
4.4
140
120
100
80
60
40
0
100
80
60
40
20
0
20
Figure 41. Enhanced Acoustics Mode with Ramp Rate = 8
As can be seen from the preceding examples, the rate at which
the fan will react to temperature change is dependent on the
ramp rate selected in the enhance acoustics registers. The higher
the ramp rate, the faster the fan will reach the newly calculated
fan speed.
Figure 42 shows the behavior of the PWM output as temperature
varies. As the temperature rises, the fan speed ramps 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 enhanced acoustics mode allows the PWM
output to be made less sensitive to temperature variations. This
will be dependent on the ramp rate selected and programmed
into the enhanced acoustics.
90
90
80
70
60
50
40
20
80
70
60
50
40
0
30
10
30
20
10
0
R
TEMP
PWM DUTY CYCLE
Figure 42. How Fan Reacts to Temperature
Variation in Enhanced Acoustics Mode
Rev. 3 | Page 38 of 56 | www.onsemi.com
相關PDF資料 |
PDF描述 |
|---|---|
| ADM1029ARQZ-R7 | IC SENSOR 2TEMP/FAN CTRL 24QSOP |
| ADM1030ARQZ-RL7 | IC SNSR TEMP/FAN PWM CTRL 16QSOP |
| 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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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:- 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇: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 供應商設備封裝: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 |
發布緊急采購，3分鐘左右您將得到回復。