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參數(shù)資料
| 型號： | TC649VPA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CAPACITOR, CLASS Y2 150NFCAPACITOR, CLASS Y2 150NF; Capacitance:150nF; Voltage rating, AC:250V; Voltage rating, DC:2500V; Capacitor dielectric type:Polypropylene; Series:B81122; Tolerance, +:20%; Tolerance, -:20%; Temp, op. |
| 中文描述： | PWM風(fēng)扇帶自動調(diào)速器關(guān)斷和FanSense⑩技術(shù) |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TC649VPA |
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TC649
DS21449C-page 12
2002 Microchip Technology Inc.
FIGURE 5-4:
SENSE Network.
FIGURE 5-5:
SENSE Waveforms.
Table 5-1 lists the recommended values of R
SENSE
based on the nominal operating current of the fan. Note
that the current draw specified by the fan manufacturer
may be a worst-case rating for near-stall conditions and
may not be the fan’s nominal operating current. The
values in Table 5-1 refer to actual average operating
current. If the fan current falls between two of the val-
ues listed, use the higher resistor value. The end result
of employing Table 5-1 is that the signal developed
across the sense resistor is approximately 450 mV in
amplitude.
TABLE 5-1:
R
SENSE
VS. FAN CURRENT
5.5
Output Drive Transistor Selection
The TC649 is designed to drive an external transistor
or MOSFET for modulating power to the fan. This is
shown as Q
1
in Figures 5-1, 5-4, 5-6, 5-7, 5-8 and 5-9.
The V
OUT
pin has a minimum source current of 5 mA
and a minimum sink current of 1 mA. Bipolar transistors
or MOSFETs may be used as the power switching
element as shown in Figure 5-6. When high current
gain is needed to drive larger fans, two transistors may
be used in a Darlington configuration. These circuit
topologies are shown in Figure 5-6: (a) shows a single
NPN transistor used as the switching element; (b)
illustrates the Darlington pair; and (c) shows an N-
channel MOSFET.
One major advantage of the TC649’s PWM control
scheme versus linear speed control is that the power
dissipation in the pass element is kept very low. Gener-
ally, low cost devices in very small packages, such as
TO-92 or SOT, can be used effectively. For fans with
nominal operating currents of no more than 200 mA, a
single transistor usually suffices. Above 200 mA, the
Darlington or MOSFET solution is recommended. For
the fan sensing function to work correctly, it is
imperative that the pass transistor be fully saturated
when “on”.
Q1
GND
V
DD
R
SENSE
SENSE
R
BASE
C
SENSE
(0.1 μF Typ.)
V
OUT
Fan
1
Ch1
100mV
Tek Run: 10.0kS/s Sample
T
Ch2
100mV
M5.00ms
Ch1
142mV
GND
[
]
T
Waveform @ Sense Resistor
90mV
50mV
GND
Waveform @ Sense Pin
2
Nominal Fan Current (mA)
R
SENSE
(
)
9.1
4.7
3.0
2.4
2.0
1.8
1.5
1.3
1.2
1.0
50
100
150
200
250
300
350
400
450
500
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| TC649VUA | CAPACITOR, CLASS Y2 22NFCAPACITOR, CLASS Y2 22NF; Capacitance:22nF; Voltage rating, AC:250V; Voltage rating, DC:2500V; Capacitor dielectric type:Polypropylene; Series:B81122; Tolerance, +:20%; Tolerance, -:20%; Temp, op. |
| TC649 | PWM Fan Speed Controller with Auto-Shutdown and FanSense Technology(風(fēng)扇監(jiān)控器帶自動關(guān)斷功能) |
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