參數(shù)資料
型號(hào)： MIC502BN
廠商： MICREL INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Replaced by PTN78060W,PTN78060H :
中文描述： BRUSHLESS DC MOTOR CONTROLLER, 0.025 A, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 1/11頁(yè)
文件大小： 130K
代理商： MIC502BN
May 1999
163
MIC502
MIC502
Micrel
MIC502
Fan Management IC
Advance Information
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
Uninterruptable power supplies
Power amplifiers
Ordering Information
Part Number
MIC502BN
MIC502BM
Temperature Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Package
8-pin Plastic DIP
8-pin SOIC
General Description
The MIC502 is a thermal and fan management IC which
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 sec-
ond 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.
Typical Application
VT1
CF
VSLP
GND
VDD
OUT
OTF
VT2
1
2
3
4
8
7
6
5
R1
T1
R3
R4
C
F
R2
12V
R
BASE
Overtemperature
Fault Output
MIC502
Secondary
Fan-control
Input
Fan
Q1
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