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参数资料
| 型号： | TC642EUA |
| 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： | 25/28页 |
| 文件大小： | 485K |
| 代理商： | TC642EUA |
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TC642
DS21444C-page 6
2002 Microchip Technology Inc.
The second condition by which the TC642 detects a
fault is when the PWM control voltage applied to VIN
becomes greater than that needed to drive 100% duty
cycle (see Section 1.0, “Electrical Characteristics”).
This indicates that the fan is at maximum drive and the
potential exists for system overheating. Either heat dis-
sipation in the system has gone beyond the cooling
system’s design limits or some subtle fault exists (such
as fan bearing failure or an airflow obstruction). This
output may be treated as a system overheat warning
and be used to trigger system shutdown. However, in
this case, the fan will continue to run even when FAULT
is asserted. If a shutdown is
desired, FAULT may be
connected to VMIN outside the device. This will latch the
TC642 in shutdown mode when any fault occurs.
3.3
VOUT Output
The VOUT pin is designed to drive a low cost transistor
or MOSFET as the low side power switching element
in the system. Various examples of driver circuits will
be shown throughout this data sheet. This output has
asymmetric complementary drive and is optimized for
driving NPN transistors or N-channel MOSFETs. Since
the system relies on PWM rather than linear control,
the power dissipation in the power switch is kept to a
minimum. Generally, very small devices (TO-92 or
SOT packages) will suffice.
3.4
Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns
the VOUT output on for 32 cycles of the PWM whenever
the fan is started from the off state. This occurs at
power-up and when coming out of shutdown mode. If
the PWM frequency is 30 Hz (CF = 1 F), the resulting
start-up time will be approximately one second. If a
fault is detected, the Diagnostic Timer is triggered
once, followed by the Start-up Timer. If the fault per-
sists, the device is shut down (see Section 3.2, “FAULT
Output”).
3.5
Shutdown Control (Optional)
If VMIN (Pin 3) is pulled below VSHDN, the TC642 will go
into shutdown mode. This can be accomplished by
driving VMIN with an open-drain logic signal or by using
an external transistor, as shown in Figure 3-1. All func-
tions are suspended until the voltage on VMIN becomes
higher than VREL (0.85V @ VDD = 5.0V). Pulling VMIN
below VSHDN will always result in complete device
shutdown
and
reset.
The
FAULT
output
is
unconditionally inactive in shutdown mode.
A small amount of hysteresis, typically one percent of
VDD (50 mV at VDD = 5.0V), is designed into the VSHDN
and VREL thresholds. The levels specified for VSHDN
include this hysteresis, plus adequate margin to
account for normal variations in the absolute value of
the threshold and hysteresis.
3.6
SENSE Input
(FanSense Technology)
The SENSE input (Pin 5) is connected to a low value
current sensing resistor in the ground return leg of the
fan circuit. During normal fan operation, commutation
occurs as each pole of the fan is energized. This
causes brief interruptions in the fan current, seen as
pulses across the sense resistor. If the device is not in
shutdown mode, and pulses are not appearing at the
SENSE input, a fault exists.
The short, rapid change in fan current (high dI/dt)
causes a corresponding dV/dt across the sense
resistor, RSENSE. The waveform on RSENSE is differen-
tiated and converted to a logic-level pulse-train by
CSENSE and the internal signal processing circuitry.
The presence and frequency of this pulse-train is a
direct indication of fan operation (see Section 5.0, “Typ-
ical Applications”, for more details).
CAUTION: Shutdown mode is unconditional. That is,
the fan will not be activated regardless of the voltage
at VIN. The fan should not be shut down until all heat
producing activity in the system is at a negligible level.
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| TC642EUA713 | 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 |
| TC642EV | 功能描述:电源管理IC开发工具 For TC642/6/7/8/9 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TC642EV | 制造商:Microchip Technology Inc 功能描述:Tools Development kit For Use |
| TC642VOA | 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 |
| TC642VOA713 | 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 |
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