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MAX31740ATA/VY+ PDF预览

MAX31740ATA/VY+

更新时间: 2023-12-18 00:00:00
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美信 - MAXIM /
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11页 628K
描述
Ultra-Simple Fan-Speed Controller

MAX31740ATA/VY+ 数据手册

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MAX31740  
Ultra-Simple Fan-Speed Controller  
General Description  
Features  
The MAX31740 is a sophisticated, yet easy-to-use fan-  
speed controller. It monitors the temperature of an external  
NTC thermistor and generates a PWM signal that can be  
used to control the speed of a 2, 3, or 4-wire fan. The fan  
control characteristics are set using external resistors,  
thereby eliminating the need for an external microcon-  
troller. Controllable characteristics include the starting  
temperature for fan control, PWM frequency, fan speed  
at low temperatures, and slope of the temperature-duty-  
cycle transfer function.  
●ꢀ Self-ContainedꢀPWMꢀFanꢀControl—NoꢀMicroꢀNeeded  
●ꢀ ControlsꢀSpeedꢀofꢀ2-,ꢀ3-,ꢀorꢀ4-WireꢀFans  
●ꢀ ResistorsꢀSetꢀFanꢀControlꢀCharacteristics  
●ꢀ Smooth,ꢀLinearlyꢀVaryingꢀPWMꢀDutyꢀCycleꢀMinimizesꢀ  
Audibility of Fan Noise  
●ꢀ AccuratelyꢀMonitorsꢀExternalꢀThermistorꢀTemperature  
●ꢀ 3.0Vꢀtoꢀ5.5VꢀOperatingꢀVoltageꢀRange  
●ꢀ -40°Cꢀtoꢀ+125°CꢀOperatingꢀTemperatureꢀRange  
●ꢀ AEC-Q100ꢀqualifiedꢀMAX31740ATA/VY+  
Because the operating characteristics are selected by  
hardwired passive components, a simple, low-cost fan-  
speed controller can be implemented without the need  
for firmware development. This can dramatically reduce  
development time for the fan control function.  
Applications  
●ꢀ ConsumerꢀEquipment  
●ꢀ CommunicationsꢀEquipment  
●ꢀ ComputingꢀEquipment  
●ꢀ IndustrialꢀEquipment  
The MAX31740 is available in a 2mm x 3mm, 8-pin TDFN  
package.  
Ordering Information appears at end of data sheet.  
Typical Application Circuits  
2-WIRE FAN-SPEED CONTROLLER  
4-WIRE FAN-SPEED CONTROLLER  
V
V
V
V
DD  
DD  
R
ST  
C
B
R
ST  
C
B
B
B
DD  
DD  
R
R
VFAN  
SENSE  
D0  
SENSE  
D0  
R
R
R
R
D1  
D1  
FREQ  
FREQ  
C
C
F
F
VFAN  
MAX31740  
MAX31740  
DMIN  
DMIN  
TACH OR  
LOCKED  
ROTOR  
PWM_OUT  
N
PWM_OUT  
33Hz  
25kHz  
D2  
D2  
GND SLOPE  
R
GND SLOPE  
R
SLOPE  
SLOPE  
19-6697; Rev 3; 12/20  

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