参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 49/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页当前第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页
ADT7462
Figure 79 shows the PWM output response for a ramp rate
of 2. In this instance, the fan takes about 17.6 seconds to
reach full running speed.
140 120
90
80
70
PWM DUTY CYCLE (%)
120
R TEMP ( ? C)
100
60
50
100
80
80
40
30
R TEMP ( ? C)
60
40
20
PWM DUTY CYCLE (%)
60
40
20
20
10
0
Figure 81. How Fan Reacts to Temperature Variations
in Enhanced Acoustics Mode
0 0
0 17.6
TIME (s)
Figure 79. Enhanced Acoustics Mode with Ramp
Rate = 2
Figure 80 shows how the control loop reacts to
temperature with the slowest ramp rate. The ramp rate is set
to 1, while all other control parameters remain the same.
With the slowest ramp rate selected, it takes 35 seconds for
the fan to reach full speed.
Slower Ramp Rates
The ADT7462 can be programmed for much longer ramp
times by slowing the ramp rates. Each ramp rate can be
slowed by a factor of 4.
PWM1 Configuration Register (0x21)
PWM2 Configuration Register (0x22)
PWM3 Configuration Register (0x23)
PWM4 Configuration Register (0x24)
120
140
Setting Bit 3 (the SLOW bit) to 1 in the PWM1 to PWM4
100
80
60
40
20
R TEMP ( ? C)
PWM DUTY CYCLE (%)
120
100
80
60
40
20
configuration registers slows the ramp rate for PWM1 to
PWM4 by 4.
Fan Freewheeling Test Mode
The fan freewheeling test mode is intended to diagnose
whether fans connected to the ADT7462 are working
properly. It is particularly useful where fans coupled in the
duct can affect the airflow of another fan. If one fan has
failed, it may not be apparent, because moving air from other
fans can cause air to flow through the faulty fan, which in
turn can cause the faulty fan to rotate.
TIME (s)
0 0
0 35
Figure 80. Enhanced Acoustics Mode with Ramp
Rate = 1
As Figure 77 to Figure 80 show, the rate at which the fan
reacts to temperature change is dependent on the ramp rate
selected in the enhanced acoustics registers. The higher the
ramp rate, the faster the fan reaches the newly calculated fan
speed.
The fan freewheeling test is most useful in a system using
primary and redundant setup. In such a system, the
following setup is recommended. The primary fans are
Fan 1, Fan 2, Fan 3, and Fan 4. The redundant fans are
Fan 5, Fan 6, Fan 7, and Fan 8. In this setup, each primary
and redundant fan can be driven separately because they are
driven by different PWMs.
PWM1 PWM2
Figure 81 shows the behavior of the PWM output as
temperature varies. As the temperature increases, the fan
speed ramps up. Small drops in temperature do not affect the
ramp-up function, because the newly calculated fan speed is
still higher than the previous PWM value. Enhanced
FAN 1
TACH CCT 1
FAN 5
FAN 2
TACH CCT 2
FAN 6
FAN 3
TACH CCT 3
FAN 7
FAN 4
TACH CCT 4
FAN 8
acoustics mode allows the PWM output to be made less
sensitive to temperature variations. This is dependent on the
ramp rate selected and programmed into the enhanced
PWM3
PWM4
acoustics registers.
Figure 82. Fan Freewheeling Test Mode Setup
http://onsemi.com
49
相关PDF资料 |
PDF描述 |
|---|---|
| ADT7467BBZEVB | BOARD EVALUATION FOR ADT7467 |
| ADT7468ZEVB | BOARD EVAL FOR ADT7468 |
| ADT7473ZEVB | BOARD EVALUATION FOR ADT7473 |
| ADT7475EBZEVB | BOARD EVALUATION FOR ADT7475 |
| ADT7476EBZEVB | BOARD EVALUATION FOR ADT7476 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7463 | 制造商:AD 制造商全称:Analog Devices 功能描述:dB COOL Remote Thermal Controller and Voltage Monitor |
| ADT7463ARQ | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7463ARQ-REEL | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7463ARQ-REEL7 | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7463ARQZ | 功能描述:马达/运动/点火控制器和驱动器 SYS MGMT CNTRLR IC RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。