參數(shù)資料
型號(hào)： TC649EUA
廠商： Microchip Technology Inc.
英文描述： PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology
中文描述： PWM風(fēng)扇帶自動(dòng)調(diào)速器關(guān)斷和FanSense⑩技術(shù)
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 478K
代理商： TC649EUA
TC649
DS21449C-page 14
2002 Microchip Technology Inc.
A base-current limiting resistor is required with bipolar
transistors (Figure 5-7). The correct value for this
resistor can be determined as follows:
V
OH
V
R
SENSE
V
R
BASE
I
BASE
= V
R
SENSE
+ V
BE(
SAT
)
+ V
R
BASE
= I
FAN
x R
SENSE
= R
BASE
x I
BASE
= I
FAN
/ h
FE
V
OH
is specified as 80% of V
DD
in Section 1.0,
“Electrical Characteristics”; V
BE(
SAT
)
is given in the cho-
sen transistor data sheet. It is now possible to solve for
R
BASE
.
EQUATION
Some applications benefit from the fan being powered
from a negative supply to keep motor noise out of the
positive supply rails. This can be accomplished as
shown in Figure 5-8, with zener diode D
1
offsetting the
-12V power supply voltage, holding transistor Q
1
off
when V
OUT
is low. When V
OUT
is high, the voltage at
the anode of D
1
increases by V
OUT
, causing Q
1
to turn
on. Operation is otherwise the same as in the case of
fan operation from +12V.
FIGURE 5-7:
R
BASE
.
Circuit For Determining
FIGURE 5-8:
Powering the Fan from a -12V Supply.
R
BASE
=
V
OH
- V
BE(
SAT
)
- V
R
SENSE
I
BASE
Q1
GND
V
DD
R
SENSE
R
BASE
V
OH
= 80% V
DD
+ V
RBASE
–
V
BE(SAT)
–
+
V
RSENSE
–
Fan
+
GND
+5V
-12V
Q1*
V
DD
V
OUT
TC649
FAN
R2*
2.2 k
R3*
2.2
R4*
10 k
D1
12.0V
Zener
Note:
* Value depends on the specific application and is shown for example only.
See Section 5.0, "Typical Applications", for more details.
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