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| 型号： | MAX6665ASA50+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 5/6页 |
| 文件大小： | 130K |
| 描述： | IC FAN CNTRL/DRVR 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部 |
| 感应温度： | 50° C 跳闸点 |
| 精确度： | ±3°C（最小值） |
| 拓扑： | 风扇控制 |
| 输出类型： | 逻辑 |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 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： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOICN 裸露焊盘 |
| 包装： | 带卷 (TR) |
increases by a maximum of:
51癈/W x 0.03125W = 1.59癈
Therefore, the effective hysteresis is about 1.59癈 high-
er than the hysteresis selected by the HYST pin. For
example, setting the HYST pin for 8癈 of hysteresis
results in an effective hysteresis of about 9.6癈.
A larger fan with a power-supply current of 250mA
causes a maximum voltage drop of 0.6V at the output
pin. This results in 150mW power dissipation and the
die temperature increases by:
51癈/W x 0.150W = 7.65癈
If the HYST pin has been set for 8癈 of hysteresis, the
total effective hysteresis will be about 15.7癈.
Using fans with somewhat higher operating current
than 250mA results in higher voltage across the output
transistor. The increased power dissipation caused by
the higher current and voltage levels will increase self-
heating, thereby increasing the effective hysteresis.
When using higher-power fans, be sure that the
MAX6665s power dissipation does not cause so much
self-heating that the MAX6665 stays on constantly.
Locating the MAX6665
The location of the MAX6665 in the system affects its
operation. Because the fan is turned on and off based
on the MAX6665s die temperature, place the MAX6665
close to major heat-generating components in the sys-
tema high-speed CPU or a power device, for exam-
ple. A higher supply voltage reduces the FANOUT
voltage, which reduces the self-heating effects.
The die temperature of the MAX6665 tracks the tempera-
ture of its leads and the EP. If it is soldered to a PC board,
it quickly reaches the temperature of the traces in that
section of the circuit board. Air temperature affects the die
temperature. Since the plastic package does not conduct
heat as well as the leads, the effect of air temperature is
much less than that of lead temperature.
Layout Issues
The MAX6665s GND pin is ground return for the fan dri-
ver and the device. Large fan current induces noise
(ground bounce) to the MAX6665. Bypass V
DD
to GND
with a 1礔 tantalum capacitor located as close to the
MAX6665 as possible. For long V
DD
and GND lines, an
additional bypass capacitor may be needed. The bypass
capacitor reduces GND noise. The EP is internally con-
nected to the GND pin. Solder the EP to the ground plane
for better electrical and thermal performance.
Fan Controller/Driver with Factory-
Programmed Temperature Thresholds
_______________________________________________________________________________________ 5
Figure 1. High-Reliability, Fail-Safe Fan Controller and Temperature Monitor
V
DD
FANON
GND
HYST
V
DD
+3.3V
+4.5V TO +24V
100mA TO 250mA
COOLING FAN
100k&
1礔
礟
I/O
I/O
SYSTEM POWER
SHUTDOWN
MAX6665
FORCEON
FANOUT
WARN
OT
V
DD
100k&
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6665ASA55 | 功能描述:马达/运动/点火控制器和驱动器 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 |
| MAX6665ASA55+ | 功能描述:马达/运动/点火控制器和驱动器 Fan Controller Driver 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 |
| MAX6665ASA55+T | 功能描述:马达/运动/点火控制器和驱动器 Fan Controller Driver 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 |
| MAX6665ASA55-T | 功能描述:马达/运动/点火控制器和驱动器 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 |
| MAX6665ASA60 | 功能描述:马达/运动/点火控制器和驱动器 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 |
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