- 您现在的位置：买卖IC网 > PDF目录22009 > ADT7473ARQZ-RL7 (ON Semiconductor)IC REMOTE THERMAL CTLR 16QSOP PDF资料下载
参数资料
| 型号： | ADT7473ARQZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 47/73页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTLR 16QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±2.5% |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
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页当前第47页第48页第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
ADT7473
THERM LIMIT
HIGH TEMP LIMIT
OPERATING
POINT
HYSTERESIS
Example 3: Increase T MIN Cycle
When the temperature drops below the low temperature
limit, T MIN can increase in the long cycle. Increasing T MIN
has the effect of running the fan slower and, therefore,
ACTUAL TEMP
LOW TEMP LIMIT
T MIN
Figure 70. Temperature Between the Operating Point
and the Low Temperature Limit
Because neither the operating point minus the hysteresis
temperature nor the low temperature limit has been
exceeded, the T MIN value is not adjusted, and the fan runs at
a speed determined by the fixed T MIN and T RANGE values
defined in the automatic fan speed control mode.
Example 2: Operating Point Exceeded ? T MIN Reduced
When the measured temperature is below the operating
point temperature minus the hysteresis, T MIN remains the
same.
Once the temperature exceeds the operating temperature
minus the hysteresis (OP ? Hyst), T MIN starts to decrease.
This occurs during the short cycle (see Figure 68). The rate
at which T MIN decreases depends on the programmed value
of n. It also depends on how much the temperature has
increased between this monitoring cycle and the last
monitoring cycle; that is, if the temperature has increased by
1 ? C, then T MIN is reduced by 2 ? C. Decreasing T MIN has the
effect of increasing the fan speed, thus providing more
cooling to the system.
quieter. The long cycle diagram in Figure 69 shows the
conditions required for T MIN to increase. A quick summary
of those conditions and the reasons they need to be true
follows.
T MIN can increase if:
? The measured temperature falls below the low temperature
limit. This means the user must choose the low limit
carefully. It should not be so low that the temperature
never falls below it because T MIN would never increase,
and the fans would run faster than necessary.
? T MIN is below the high temperature limit. T MIN is
never allowed to increase above the high temperature
limit. As a result, the high limit should be sensibly
chosen because it determines how high T MIN can go.
? T MIN is below the operating point temperature. T MIN
should never be allowed to increase above the operating
point temperature because the fans would not switch on
until the temperature rose above the operating point.
? The temperature is above T MIN . The dynamic T MIN
control is turned off below T MIN .
THERM
LIMIT
HIGH TEMP
LIMIT
OPERATING
POINT
HYSTERESIS
If the temperature slowly increases only in the range
(OP ? Hyst), that is, ? 0.25 ? C per short monitoring cycle,
then T MIN does not decrease. This allows small changes in
temperature in the desired operating zone without changing
T MIN . The long cycle makes no change to T MIN in the
temperature range (OP ? Hyst) because the temperature has
not exceeded the operating temperature.
Once the temperature exceeds the operating temperature,
the long cycle causes T MIN to be reduced by 1 ? C every long
cycle while the temperature remains above the operating
ACTUAL
TEMP
T MIN
LOW TEMP
LIMIT
NO CHANGE IN T MIN HERE
DUE TO ANY CYCLE BECAUSE
T1(n) - T1 (n - 1) ≤ 0.25 5 C
AND T1(n) < OP = > T MIN
STAYS THE SAME
temperature. This takes place in addition to the decrease in
T MIN that occurs due to the short cycle. In Figure 71, because
the temperature is increasing at a rate ? 0.25 ? C per short cycle,
no reduction in T MIN takes place during the short cycle.
Once the temperature falls below the operating
temperature, T MIN stays the same. Even when the
temperature starts to increase slowly, T MIN stays the same
because the temperature increases at a rate ? 0.25 ? C per cycle.
DECREASE HERE DUE TO DECREASE HERE DUE TO
SHORT CYCLE ONLY LONG CYCLE ONLY
T1(n) - T1 (n - 1) = 0.5 5 C T1(n) - T1 (n - 1) ≤ 0.25 5 C
OR 0.75 5 C = > T MIN AND T1(n) > OP = > T MIN
DECREASES BY 1 5 C DECREASES BY 1 5 C
EVERY SHORT CYCLE EVERY LONG CYCLE
Figure 71. Effect of Exceeding Operating Point Minus
Hysteresis Temperature
http://onsemi.com
47
相关PDF资料 |
PDF描述 |
|---|---|
| TPSC157K004R0070 | CAP TANT 150UF 4V 10% 2312 |
| ADT7473ARQZ-1R7 | IC THERM MON FAN CTLR 16-QSOP |
| TAJD686K016HNJ | CAP TANT 68UF 16V 10% 2917 |
| ADT7468ARQZ-RL7 | IC REMOTE THERMAL CTLR 24QSOP |
| TAJD686K016H | CAP TANT 68UF 16V 10% 2917 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7473EBZEVB | 功能描述:EVALUATION BOARD ADT7473 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
| ADT7473ZEVB | 功能描述:BOARD EVALUATION FOR ADT7473 RoHS:是 类别:编程器，开发系统 >> 过时/停产零件编号 系列:dBCool® 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7475 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Monitor and Fan Controller |
| ADT7475_1110 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dbCOOL Remote Thermal Monitor and Fan Controller |
| ADT7475ARQZ | 功能描述:马达/运动/点火控制器和驱动器 MLTCH TDM FAN CTRLR 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。