Microchip MIC502 Bedienungsanleitung
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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
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MIC502 |
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