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MIC502_06

更新时间: 2024-11-23 07:17:03
品牌 Logo 应用领域
麦瑞 - MICREL 风扇
页数 文件大小 规格书
15页 235K
描述
Fan Management IC

MIC502_06 数据手册

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MIC502  
Fan Management IC  
General Description  
Features  
The MIC502 is a thermal and fan management IC which  
supports the features for NLX/ATX power supplies and  
other control applications.  
Temperature-proportional fan speed control  
Low-cost, efficient PWM fan drive  
4.5V to 13.2V IC supply range  
Fan speed is determined by an external temperature  
sensor, typically a thermistor-resistor divider, and (option-  
ally) a second signal, such as the NLX “FanC” signal. The  
MIC502 produces a low-frequency pulse-width modulated  
output for driving an external motor drive transistor. Low-  
frequency PWM speed control allows operation of  
standard brushless dc fans at low duty cycle for reduced  
acoustic noise and permits the use of a very small power  
transistor. The PWM time base is determined by an  
external capacitor.  
Controls any voltage fan  
Overtemperature detection with fault output  
Integrated fan startup timer  
Automatic user-specified sleep mode  
Supports low-cost NTC/PTC thermistors  
8-pin DIP and SOIC packages  
Applications  
An open-collector overtemperature fault output is asserted  
if the primary control input is driven above the normal  
control range.  
NLX and ATX power supplies  
Personal computers  
File servers  
The MIC502 features a low-power sleep mode with a user-  
determined threshold. Sleep mode completely turns off the  
fan and occurs when the system is asleep or off (both  
control inputs very low). A complete shutdown or reset can  
also be initiated by external circuitry as desired.  
Telecom and networking hardware  
Printers, copiers, and office equipment  
Instrumentation  
Uninterruptible power supplies  
Power amplifiers  
The MIC502 is available as 8-pin plastic DIP and SOIC  
packages in the –40°C to +85°C industrial temperature  
range.  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
___________________________________________________________________________________________________________  
Typical Application  
12V  
Fan  
T1 R1  
MIC502  
1
2
3
4
8
7
6
5
VT1  
CF  
VDD  
OUT  
RBASE  
R2  
R3  
R4  
Q1  
VSLP OTF  
GND VT2  
Overtemperature  
Fault Output  
CF  
Secondary  
Fan-contro  
l
Input  
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-112206  
November 2006  
1

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