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参数资料
| 型号： | TC647VOART |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 2/15页 |
| 文件大小： | 117K |
| 代理商： | TC647VOART |
10
TC647-2 12/05/00
TC647
PWM Fan Speed Controller with FanSense*
2001 Microchip Technology Inc.
DS21447A
Output Drive Transistor Selection
The TC647 is designed to drive an external transistor for
modulating power to the fan. This is shown as “Q1” in
Figures 2, 6, 7, 9, 10, and 11. The VOUT pin has a minimum
source current of 5mA and a minimum sink current of 1mA
at VDD = 5.0V. Bipolar transistors or MOSFET’s may be used
as the power switching element as shown below. 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 9: (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 TC647’s PWM control
scheme versus linear speed control is that the dissipation in
the pass element is kept very low. Generally, low-cost
devices in very small packages such as TO-92 or SOT, can
be used effectively. For fans with nominal operating cur-
rents of no more than 200mA, a single transistor usually
suffices. Above 200mA, 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”. The minimum gain (hFE) of the transis-
tor in question must be adequate to fully saturate the
transistor when passing the full fan current and being driven
within the 5mA IOH of the VOUT output.
Table 2 gives examples of some commonly available
transistors. This table is a guide only. There are many
transistor types which might work as well as those listed.
The only critical issues when choosing a device to use as Q1
are: (1) the breakdown voltage, VCE(BR), must be large
enough to stand off the highest voltage applied to the fan
(NOTE: this may be when the fan is off!); (2) the gain (hFE)
must be high enough for the device to remain fully saturated
while conducting the maximum expected fan current and
being driven with no more than 5mA of base/gate drive at
maximum temperature; (3) rated fan current draw must be
within the transistor’s current handling capability; and (4)
power dissipation must be kept within the limits of the
chosen device.
Table 2. Transistors for Q1
Device
VBE(SAT) MIN hFE
VBR(CEO)
IC
RBASE (
)
MPS2222
1.3
100
30
150
800
MPS2222A
1.2
100
40
150
800
2N4400
0.95
50
40
150
820
2N4401
0.95
100
40
150
820
MPS6601
1.2
50
25
500
780
MPS6602
1.2
50
40
500
780
A base-current limiting resistor is required with bipolar
transistors. This is shown in Figure 6. The correct value for
this resistor can be determined as follows: (see Figure 6).
Q1
Q2
GND
VDD
RSENSE
RBASE
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
Figure 9. Output Drive Transistor Circuit Topologies
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC647VOATR | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC647VPA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC647VUA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC647VUATR | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC648 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
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