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| 型号： | MAX34441ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/53页 |
| 文件大小： | 0K |
| 描述： | IC PS MANAGER PMBUS 5CH 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 应用： | 基站网络线路卡，服务器 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 2.5mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
| 其它名称： | 90-34441+TTR |
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PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
One or all of the six available temperature sensors can
be used to control the fan speed. Each temperature
sensor has an offset adjustment that allows monitor-
ing specific temperature zones with different thermal
characteristics. In Figure 1, I 2 C temperature sensor 0 is
monitoring a zone that is 15 N C more sensitive than the
zone that the I 2 C temperature sensor 3 is measuring.
To keep the audible noise and fan power consumption
as low as possible, the device allows each temperature
sensor to have a temperature offset added. This allows
temperature zones with different thermal profiles to con-
trol the fan at the lowest possible speed to maintain the
required temperature.
If no temperature sensors are assigned to control the fan,
the output fan PWM signal is ramped to 100% duty cycle.
In Figure 2, at temperature sample 1, the required fan
speed is at the level associated with temperature level
2 and since temperature sample 1 is above temperature
level 3, the fan PWM duty cycle needs to be increased
to increase the fan speed. The device increases the fan
PWM duty cycle at a rate controlled by the RAMP bits in
the MFR_FAN_CONFIG command code. If the PWM duty
cycle has not reached the target value before the tem-
perature sample detects that a new PWM target value is
needed, the device stops moving toward the old target
SENSOR
TEMPERATURE
T7
and starts moving to the new target according to the
programmed ramp rate.
At temperature sample 2, the temperature has increased
to greater than temperature level 4 so again the PWM
duty cycle must be increased. At temperature sample
3, the temperature has dropped but not below the ther-
mal hysteresis level (which is set by the HYS bits in the
MFR_FAN_CONFIG command code), so the fan speed
remains at level 4. At temperature sample 4, the tem-
perature has dropped below the hysteresis point so the
PWM duty cycle is decreased.
Pulse Stretching
In some 3-wire fan applications, when the supply power
is interrupted to control fan speed, the tachometer sig-
nal is not available. Some fan controllers periodically
stretch the PWM signal to allow the tachometer to be
accurately detected. Pulse stretching can create audible
noise. This_device_does_not_implement_pulse_stretch-
ing._ Hence, the RPM fan modes that require a reliable
tachometer signal to be available at all times should
not be used in applications that switch power to the fan
to control the speed of the fan. For example, low-side
switching of a 3-wire fan should not use either of the RPM
fan modes.
FAN SPEED
S7
T6
SAMPLED TEMPERATURES
S6
THERMAL
HYSTERESIS
T5
SAMPLE 2
SAMPLE 3
S5
T4
S4
T3
T2
T1
T0
SAMPLE 1
SAMPLE 4
S3
S2
S1
S0
ELAPSED TIME
TEMPERATURE SAMPLE RATE
(ONCE PER SECOND)
Figure 2. Fan Speed Example
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX34441EVKIT# | 功能描述:电源管理IC开发工具 MAX34441 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX34446ETL+ | 功能描述:监控电路 PMBus Power Supply Data Logger RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX34446ETL+T | 功能描述:监控电路 PMBus Power Supply Data Logger RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX34446EVKIT# | 功能描述:监控电路 MAX34446 Eval Kit RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX3444EAPA | 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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