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参数资料
| 型号： | TC649VOART |
| 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： | 3/17页 |
| 文件大小： | 119K |
| 代理商： | TC649VOART |
11
TC649-2 12/05/00
TC649
2001 Microchip Technology Inc.
DS21449A
PWM Fan Speed Controller with Auto-Shutdown
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 5. The correct value for
this resistor can be determined as follows: (see Figure 5).
VOH = VRSENSE + VBE(SAT) + VRBASE
VRSENSE = IFAN x RSENSE
VRBASE = RBASE x IBASE
IBASE= IFAN / hFE
VOH is specified as 80% of VDD in the Electrical Charac-
teristics table; VBE(SAT) is given in the transistor data sheet.
It is now possible to solve for RBASE.
RBASE =
VOH – VBE(SAT) – VRSENSE
IRBASE
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 9, Zener diode D1 offsets the –12V power supply
voltage, holding transistor Q1 OFF when VOUT is LOW.
When VOUT is HIGH, the voltage at the anode of D1
increases by VOH, causing Q1 to turn ON. Operation is
otherwise the same as in the case of fan operation from
+12V.
Latch-up Considerations
As with any CMOS IC, the potential exists for latch-up
if signals outside the power supply range are applied to the
device. This is of particular concern during power-up if the
external circuitry, such as the sensor network, VAS divider,
or Shutdown circuit, are powered by a supply different from
that of the TC649. Care should be taken to ensure that the
TC649’s VDD supply powers-up first. If possible, the net-
works attached to VIN and VAS should connect to the VDD
supply at the same physical location as the IC itself. Even if
the IC and any external networks are powered by the same
supply, physical separation of the connecting points can
result in enough parasitic capacitance and/or inductance in
the power supply connections to delay one power supply
“routing” versus another.
Power Supply Routing and Bypassing
Noise present on the VIN and VAS inputs may cause
erroneous operation of the FAULT output. As a result, these
inputs should be bypassed with a 0.01
F capacitor mounted
as close to the package as possible. This is especially true
of VIN, which usually is driven from a high impedance source
(such as a thermistor). In addition, the VDD input should be
bypassed with a 1
F capacitor. Grounds should be kept as
short as possible. To keep fan noise off the TC649 ground
pin, individual ground returns for the TC649 and the low side
of the fan current sense resistor should be used.
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 8. Output Drive Transistor Circuit Topologies
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC649VOATR | 功能描述:马达/运动/点火控制器和驱动器 Shtdn & 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 |
| TC649VPA | 功能描述:马达/运动/点火控制器和驱动器 Shtdn & 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 |
| TC649VUA | 功能描述:马达/运动/点火控制器和驱动器 Shtdn & 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 |
| TC649VUATR | 功能描述:马达/运动/点火控制器和驱动器 Shtdn & 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 |
| TC6-4A11 | 制造商:FERROXCUBE 制造商全称:Ferroxcube International Holding B.V. 功能描述:Ferrite toroids |
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