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TC647 数据表(PDF) 6 Page - Microchip Technology

部件名 TC647
功能描述  PWM Fan Speed Controller with FanSense Technology
PDF  28 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

TC647 数据表(HTML) 6 Page - Microchip Technology

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TC647
DS21447C-page 6
 2002 Microchip Technology Inc.
Continuous restart mode is enabled by connecting the
FAULT output to VMIN through a 0.1 µF capacitor, as
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 VMIN input is momentarily pulled below
VSHDN, initiating a reset and clearing the fault
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.
FIGURE 3-1:
Fan Fault Output Circuit.
FAULT
SENSE
R1
10 k
Ω
1 k
Ω
GND
From
System
Shutdown
Controller
(Optional)
Note: The parallel combination of R3 and R4 must be >10 kΩ.
+12V
+5V
+5V
VDD
VIN
VMIN
VOUT
RBASE
RSENSE
CSENSE
CF
1 µF
CF
TC647
Fan
CB
0.01 µF
0.01µF
1
8
CB
1µF
6
7
5
4
2
3
From
Temp
Sensor
+5V
1
0
TC647
RESET
Fault
Detected
C1
Q1
Q2
R3
R4



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