Datasheet > MIC502_11

MIC502_11

更新时间： 2024-11-09 10:56:59

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

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MIC502_11 数据手册

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

VT1

VDD

OUT

R_BASE

VSLP OTF

GND VT2

Overtemperature

Fault Output

C_F

Secondary

Fan-contro

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

12 3 4 5 6 7...15

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