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MIC502
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MIC502
Fan Management IC
Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - 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 uency PWM speed control allows -freq
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 available on
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
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | ej kategoriserat |
| Modell: | MIC502 |
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