TC647 Microchip, TC647 Datasheet - Page 6

• Manufacturer Part Number: TC647
• Description: PWM Fan Speed Controller
• Manufacturer: Microchip

TC647
Continuous restart mode is enabled by connecting the
FAULT output to V
shown in Figure 3-1. When so connected, the TC647
automatically attempts to restart the fan whenever a
fault condition occurs. When the FAULT output is
driven low, the V
V
FIGURE 3-1:
DS21447C-page 6
SHDN
Shutdown
Controller
Note: The parallel combination of R 3 and R 4 must be >10 k .
, initiating a reset and clearing the fault
System
From
MIN
(Optional)
MIN
R
input is momentarily pulled below
1
Fan Fault Output Circuit.
through a 0.1 µF capacitor, as
Q
2
+5V
0.01µF
From
Temp
Sensor
R
C
R
4
1
3
C
0.01 µF
B
C
1 µF
F
3
2
1
V
V
C
IN
MIN
F
+5V
8
V
TC647
DD
GND
condition. Normal fan start-up is then attempted as pre-
viously described. The FAULT output may be
connected to external logic (or the interrupt input of a
microcontroller) to shut the TC647 down if multiple fault
pulses are detected at approximately one second
intervals.
4
C
1µF
B
FAULT
SENSE
V
OUT
6
7
5
+5V
C
10 k
1 kΩ
SENSE
2002 Microchip Technology Inc.
Detected
1
0
Fault
TC647
RESET
R
SENSE
R
BASE
+12V
Fan
Q
1