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| 型号： | TC649BEUATR |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 5/36页 |
| 文件大小： | 704K |
| 代理商： | TC649BEUATR |
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2003 Microchip Technology Inc.
DS21755B-page 13
TC646B/TC648B/TC649B
For the TC646B, TC648B and TC649B devices, the VIN
pin is also used as the shutdown pin. The VSHDN and
VREL threshold voltages are characterized in the “Elec-
trical Characteristics Table” of Section 1.0. If the VIN pin
voltage is pulled below the VSHDN threshold, the device
will shut down (VOUT output goes to a low state, the
FAULT/OTF pin is inactive). If the voltage on the VIN pin
then rises above the release threshold (VREL), the
device will go through a power-up sequence (assuming
that the VIN voltage is also higher than the voltage at
the VAS pin). The power-up sequence is shown later in
the “Behavioral Algorithm Flowcharts” of Section 4.9.
FIGURE 4-4:
VIN Voltage vs. PWM Duty
Cycle (Typical).
4.5
Auto-Shutdown Mode (VAS)
For the TC646B, TC648B and TC649B devices, pin 3
is the VAS pin and is used for setting the auto-shutdown
threshold voltage.
The auto-shutdown function provides a way to set a
threshold voltage (temperature) at which the fan will be
shut off. This way, if the temperature in the system
reaches a threshold at which the fan(s) no longer needs
to operate, the fan can be shutdown automatically.
The voltage range for the VAS pin is the same as the
voltage range for the VIN pin (1.20V to 2.60V). The volt-
age at the VAS pin is set in this range so that when the
voltage at the VIN pin decreases below the voltage at
the VAS pin (signifying that the threshold temperature
has been reached), the VOUT output is shut off (goes to
a low state). In auto-shutdown, the FAULT/OTF output
is inactive (high-impedance). Auto-shutdown mode is
exited when the VIN voltage exceeds the VAS voltage
by the auto-shutdown hysteresis voltage (VHAS). Upon
exiting auto-shutdown mode, the start-up timer is
triggered and the device returns to normal operation.
4.6
VOUT Output (PWM Output)
The VOUT output is a digital output designed for driving
the base of a transistor or the gate of a MOSFET. The
VOUT output is designed to be able to quickly raise the
base current or the gate voltage of the external drive
device to its final value.
When the device is in shutdown/auto-shutdown mode,
the VOUT output is actively held low. The output can be
varied from 0% (full off) to 100% duty cycle (full on). As
previously discussed, the duty cycle of the VOUT output
is controlled via the VIN input voltage and can be termi-
nated based on the VAS voltage.
A base current-limiting resistor is required when using
a transistor as the external drive device in order to limit
the amount of drive current that is drawn from the VOUT
output.
The VOUT output can be directly connected to the gate
of an external MOSFET. One concern when doing this,
though, is that the fast turn-off time of the fan drive
MOSFET can cause a problem because the fan motor
looks like an inductor. When the MOSFET is turned off
quickly, the current in the fan wants to continue to flow
in the same direction. This causes the voltage at the
drain of the MOSFET to rise. If there aren’t any clamp
diodes internal to the fan, this voltage can rise above
the drain-to-source voltage rating of the MOSFET. For
this reason, an external clamp diode is suggested. This
is shown in Figure 4-5.
FIGURE 4-5:
Clamp Diode for Fan.
4.7
FAULT/OTF Output
The FAULT/OTF output is an open-drain, active-low
output. For the TC646B and TC649B devices, pin 6 is
labeled as the FAULT output and indicates when a fan
fault condition has occurred. For the TC646B device,
the FAULT output also indicates when an over-temper-
ature (OTF) condition has occurred. For the TC648B
device, pin 6 is the OTF output that indicates an over-
temperature (OTF) condition has occurred.
0
10
20
30
40
50
60
70
80
90
100
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
VIN (V)
Duty
Cycle
(%)
Q1
GND
RSENSE
VOUT
Q1: N-Channel MOSFET
FAN
Clamp Diode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC649E | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| TC649EOA | 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 |
| TC649EOATR | 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 |
| TC649EPA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| TC649EUA | 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 |
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