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| 型号： | TC665EUN |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 4/36页 |
| 文件大小： | 695K |
| 代理商： | TC665EUN |
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TC664/TC665
DS21737A-page 12
2002 Microchip Technology Inc.
FIGURE 4-6:
NTC Thermistor Sensor
Network.
The second method for controlling the duty cycle of the
PWM output (VOUT) is via the SMBus interface. In order
to control the PWM duty cycle via the SMBus, DUTYC
(bit 5<0>) of the Configuration Register (Register 6.3)
must be set to a ‘1’. This tells the TC664/TC665 device
that the duty cycle should be controlled by the Duty
Cycle Register. Next, the Duty Cycle Register must be
programmed to the desired value. The Duty Cycle Reg-
ister is a 4 Bit read/write register that allows duty cycles
from 30% to 100% to be programmed. Table 4-1 shows
the binary codes for each possible duty cycle.
TABLE 4-1:
DUTY-CYCLE REGISTER
(DUTY-CYCLE) 4-BITS,
READ/WRITE
This method of control allows for more sophisticated
algorithms to be implemented by utilizing microcontrol-
lers or microprocessors in the system. In this way, mul-
tiple system temperatures can be taken into account for
determining the necessary fan speed.
As shown in Table 4-1, the duty cycle has more of a
step function look than did the VIN control approach.
Because the step changes in duty cycle are small, they
are rarely audibly noticeable, especially when the fans
are integrated into the system.
4.6
PWM Output (VOUT)
The VOUT pin is designed to drive a low cost NPN tran-
sistor or N-channel MOSFET as the low side switching
element in the system, as is shown in Figure 4-7. The
switching element is used to turn the fan on and off at
the PWM duty cycle commanded by the VOUT output
This output has complementary drive (pull up and pull
down) and is optimized for driving NPN transistors or
N-channel MOSFETs (see typical characteristic curves
for sink and source current capability of the VOUT drive
stage).
The external device needs to be chosen to fit the volt-
age and current rating of the fan in a particular applica-
tion (Refer to Section 7.5 Output Drive Device
Selection). NPN transistors are often a good choice for
low current fans. If a NPN transistor is chosen, a base
current limiting resistor should be used. When using a
MOSFET as the switching element, it is sometimes a
good idea to have a gate resistor to help slow down the
turn on and turn off of the MOSFET. As with any switch-
ing waveform, fast rising and falling edges can
sometimes lead to noise problems.
As previously stated, the VOUT output will go to 100%
duty cycle during power up and release from shutdown
conditions. The VOUT output only shuts down when
commanded to do so via the Configuration Register
(SDM (bit 0<0>)). Even when a locked rotor condition
is detected, the VOUT output will continue to pulse at
the programmed duty cycle.
4.7
Sensing Fan Operation (SENSE)
The TC664/TC665 devices also feature Microchip’s
proprietary FanSense technology. During normal fan
operation, commutation occurs as each pole of the fan
is energized. The fan current pulses created by the fan
commutation are sensed using a low value current
sense resistor in the ground return leg of the fan circuit.
The voltage pulses across the sense resistor are then
AC coupled through a capacitor to the SENSE pin of
the TC664/TC665 device. These pulses are utilized for
calculating the RPM of the fan. The threshold voltage
for the SENSE pin is 100 mV (typical). The peak of the
voltage pulse at the SENSE pin must exceed the
100 mV (typical) threshold in order for the pulse to be
counted in the fan RPM measurement.
Duty-Cycle Register (Duty Cycle)
D(3)
D(2)
D(1)
D(0)
Duty-Cycle
000
0
30%
0
1
34.67%
0
1
0
39.33% (default for VIN
open and when SMBus
is not selected)
001
1
44%
0
1
0
48.67%
0
1
0
1
53.33%
011
0
58%
0
1
62.67%
1
0
67.33%
100
1
72%
1
0
1
0
76.67%
1
0
1
81.33%
110
0
86%
1
0
1
90.67%
1
0
95.33%
111
1
100%
VIN
+5 V
NTC Thermistor
R1
R2
C1
0.01 F
100 k
@ 25°C
TC664
TC665
GND
34.8 k
14.7 k
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC665EUNTR | 功能描述:马达/运动/点火控制器和驱动器 Single 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 |
| TC67 | 功能描述:铝质电解电容器 - 带引线 40uF 350V RoHS:否 制造商:Kemet 引线类型: 电容:220 uF 容差:20 % 电压额定值:25 V 工作温度范围: 端接类型:Radial 外壳直径:8 mm 外壳长度:11 mm 引线间隔:5 mm 产品:General Purpose Electrolytic Capacitors 封装:Bulk |
| TC670 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector |
| TC670_03 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector |
| TC670_13 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector |
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