Microchip MIC502 Handleiding

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MIC502

Fan Management IC

Micrel Inc. • 2180 Fortune Drive • SanJose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October

6, 2014

Revision 3.0

General Description

The MIC502 is a thermal and fan management IC that

supports the features for NLX/ATX power supplies and

other control applications.

Fan speed is determined by an external temperature

sensor, typically a thermistor-resistor divider, and

(optionally) 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.

An open-collector overtemperature fault output is asserted

if the primary control input is driven above the normal

control range.

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.

The MIC502 is available as 8-pin plastic DIP and SOIC

packages in the –40°C to +85°C industrial temperature

range.

Datasheets and support documentation are availableon

Micrel’s web site at: www.micrel.com

.

Features

•Temperature-proportional fan speed control

•Low-cost, efficient PWM fan drive

•4.5V to 13.2V IC supply range

•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

•NLX and ATX power supplies

•Personal computers

•File servers

•Telecom and networking hardware

•Printers, copiers, and office equipment

•Instrumentation

•Uninterruptible power supplies

•Power amplifiers

Typical Application

Product specificaties