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| 型號(hào)： | ADT7463ARQZ-REEL |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 27/50頁(yè) |
| 文件大?。?/td> | 726K |
| 描述： | IC REMOTE THERMAL CTRLR 24-QSOP |
| 產(chǎn)品變化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | -40°C ~ 120°C，外部傳感器 |
| 精確度： | ±1.5°C（最小值） |
| 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(kù) |
| 輸出類型： | SMBus? |
| 輸出警報(bào)： | 無(wú) |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 120°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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ADT7463
http://onsemi.com
27
pullup on the gate is tied to 5 V. The MOSFET should also
have a low on resistance to ensure that there is not significant
voltage drop across the FET. This reduces the voltage
applied across the fan and therefore the maximum operating
speed of the fan.
Figure 40 shows how a 3wire fan may be driven using
PWM control.
Figure 40. Driving a 3wire Fan Using an Nchannel
MOSFET
ADT7463
TACH/AIN
PWM
Q1
NDT3055L
12 V
FAN
3.3 V
12 V
12 V
10 kW
4.7 kW
10 kW
10 kW
TACH
Figure 40 uses a 10 kW pullup resistor for the TACH
signal. This assumes that the TACH signal is opencollector
from the fan. In all cases, the TACH signal from the fan must
be kept below 5 V maximum to prevent damaging the
ADT7463. If in doubt as to whether the fan used has an
opencollector or totem pole TACH output, use one of the
input signal conditioning circuits shown in the Fan Speed
Measurement section of the data sheet.
Figure 41 shows a fan drive circuit using an NPN
transistor such as a generalpurpose MMBT2222. While
these devices are inexpensive, they tend to have much lower
current handling capabilities and higher on resistance than
MOSFETs. When choosing a transistor, care should be taken
to ensure that it meets the fans current requirements.
Ensure that the base resistor is chosen such that the
transistor is saturated when the fan is powered on.
Figure 41. Driving a 3wire Fan Using
an NPN Transistor
ADT7463
TACH/AIN
PWM
Q1
MMBT2222
12 V
FAN
3.3 V
12 V
12 V
10 kW
4.7 kW
470 W
10 kW
TACH
Driving Two Fans from PWM3
Note that the ADT7463 has four TACH inputs available
for fan speed measurement, but only three PWM drive
outputs. If a fourth fan is being used in the system, it should
be driven from the PWM3 output in parallel with the third
fan. Figure 42 shows how to drive two fans in parallel using
low cost NPN transistors. Figure 43 is the equivalent circuit
using the NDT3055L MOSFET. Note that since the
MOSFET can handle up to 3.5 A, it is simply a matter of
connecting another fan directly in parallel with the first.
Care should be taken in designing drive circuits with
transistors and FETs to ensure that the PWM pins are not
required to source current and that they sink less than the
8 mA maximum current specified on the data sheet.
Figure 42. Interfacing Two Fans in Parallel to the
PWM3 Output Using Low Cost NPN Transistors
ADT7463
PWM3
Q1
MMBT3904
3.3 V
1 kW
TACH4
2.2 kW
3.3 V
TACH3
10 W
10 W
12 V
Q2
MMBT2222
Q3
MMBT2222
Figure 43. Interfacing Two Fans in Parallel to the
PWM3 Output Using a Single Nchannel MOSFET
ADT7463
TACH4
Q1
NDT3055L
3.3 V
10 kW
TYP
TACH3
PWM3
3.3 V
3.3 V
10 kW
TYP
10 kW
TYP
+V
+V
5 V
or
12 V
FAN
TACH
5 V
or
12 V
FAN
TACH
Driving Up to Three Fans from PWM2
TACH measurements for fans are synchronized to
particular PWM channels, e.g., TACH1 is synchronized to
PWM1. TACH3 and TACH4 are both synchronized to
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| ADT7463ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 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(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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 |
| ADT7466 | 制造商:AD 制造商全稱:Analog Devices 功能描述:dBCool Remote Thermal Controller and Voltage Monitor |
| ADT7466ARQZ | 功能描述:板上安裝溫度傳感器 RMT THRM CTR VLT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7466ARQZ-REEL | 功能描述:板上安裝溫度傳感器 RMT THRM CTR VLT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7466ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 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(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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 |
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