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TC642 Datasheet(PDF) 13 Page - Microchip Technology

Part # TC642
Description  PWM Fan Speed Controller with FanSense??Technology
PDF  28 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC642 Datasheet(HTML) 13 Page - Microchip Technology

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 2002 Microchip Technology Inc.
DS21444C-page 13
TC642
Some applications require the fan to be powered from
the negative 12V supply to keep motor noise out of the
positive voltage power supplies. As is shown in
Figure 5-8, zener diode D1 offsets the -12V power sup-
ply voltage, holding transistor Q1 off when VOUT is low.
When VOUT is high, the voltage at the anode of D1
increases by VOUT, causing Q1 to turn on. Operation is
otherwise consistent with the case of fan operation
from +12V.
FIGURE 5-7:
Output Drive Transistor Circuit Topologies.
FIGURE 5-8:
Powering the Fan From a -12V Supply.
Q1
Q1
Q2
GND
VDD
RSENSE
RBASE
VOUT
VOUT
Fan
a) Single Bipolar Transistor
Q1
GND
VDD
RSENSE
VOUT
c) N-Channel MOSFET
GND
VDD
RSENSE
RBASE
Fan
b) Darlington Transistor Pair
Fan
GND
+5V
Q1*
VDD
VOUT
TC642
Fan
R2*
2.2 k
Ω
R3*
2.2
Ω
R4*
10 k
Ω
D1
12.0V
Zener
-12V
*Note: Value depends on the specific application and is shown for example only.



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