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TC642BEPATR Datasheet(PDF) 25 Page - Microchip Technology

Part # TC642BEPATR
Description  PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense??Technology for Fault Detection
PDF  34 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC642BEPATR Datasheet(HTML) 25 Page - Microchip Technology

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 2003 Microchip Technology Inc.
DS21756B-page 25
TC642B/TC647B
FIGURE 5-13:
Design Example Schematic.
Bypass capacitor CVDD is added to the design to
decouple the bias voltage. This is good to have, espe-
cially when using a MOSFET as the drive device. This
helps to give a localized low-impedance source for the
current required to charge the gate capacitance of Q1.
Two other bypass capacitors, labeled as CB, were also
added to decouple the VIN and VMIN nodes. These
were added simply to remove any noise present that
might cause false triggerings or PWM jitter. R5 is the
pull-up resistor for the FAULT output. The value for this
resistor is system-dependent.
FAULT
SENSE
R1
R2
R3
32.4 k
Ω
R4
GND
Q1
+12V
+5V
VDD
VIN
VMIN
VOUT
RSENSE
CSENSE
CF
1.0 µF
CF
TC647B
Fan
CB
0.01 µF
CB
0.01 µF
+
4
5
7
6
8
1
3
2
+5V
17.8 k
Ω
237 k
Ω
45.3 k
Ω
R5
10 k
Ω
0.1 µF
SI2302
or
MGSF1N02E
Panasonic®
12V, 140 mA
FBA06T12H
Thermometrics®
100 k
Ω @25°C
NHQ104B425R5
CVDD
1.0 µF
3.0
Ω



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