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| 型号： | TC649BEPA |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDIP8 |
| 封装： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件页数： | 6/36页 |
| 文件大小： | 704K |
| 代理商： | TC649BEPA |
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TC646B/TC648B/TC649B
DS21755B-page 14
2003 Microchip Technology Inc.
For the TC646B and TC648B devices, an over-temper-
ature condition is indicated when the VIN input reaches
the VOTF threshold voltage (the VOTF threshold voltage
is typically 20 mV higher than the VCMAX threshold and
has 80 mV of hysteresis). This indicates that maximum
cooling capacity has been reached (the fan is at full
speed) and that an overheating situation can occur.
When the voltage at the VIN input falls below the VOTF
threshold voltage by the hysteresis value (VOTF-HYS),
the FAULT/OTF output will return to the high state (a
pull-up resistor is needed on the FAULT/OTF output).
For the TC646B/TC649B devices, a fan fault condition
is indicated when fan current pulses are no longer
detected at the SENSE pin. Pulses at the SENSE pin
indicate that the fan is spinning and conducting current.
If pulses are not detected at the SENSE pin for
32 PWM cycles, the 3-cycle diagnostic timer is fired.
This means that the VOUT output is high for 3 PWM
cycles. If pulses are detected in this 3-cycle period, nor-
mal PWM operation is resumed and no fan fault is indi-
cated. If no pulses are detected in the 3-cycle period,
the start-up timer is activated and the VOUT output is
driven high for 32 PWM cycles. If pulses are detected
during this time-frame, normal PWM operation is
resumed. If no pulses are detected during this time-
period, a fan fault condition exists and the FAULT
output is pulled low.
During a fan fault condition, the FAULT output will
remain low until the fault condition has been removed.
During this time, the VOUT output is driven high contin-
uously to attempt to restart the fan and the SENSE pin
is monitored for fan pulses. If a minimum of 16 pulses
are detected at the SENSE input over a 32 cycle time-
period (one second for CF = 1.0 F), the fan fault con-
dition no longer exists. Therefore, The FAULT output is
released and the VOUT output returns to normal PWM
operation, as dictated by the VIN and VAS inputs.
If the VIN voltage is pulled below the VSHDN level during
a fan fault condition, the FAULT output will be released
and the VOUT output will be shutdown (VOUT = 0V). If
the VIN voltage then increases above the VREL thresh-
old and is above the VAS voltage, the device will go
through the normal start-up routine.
If, during a fan fault condition, the voltage at the VIN pin
drops below the VAS voltage level, the TC646B/
TC649B device will continue to hold the FAULT line low
and drive the VOUT output to 100% duty cycle. If the fan
fault condition is then removed, the FAULT output will
be released and the TC646B/TC649B device will enter
auto-shutdown mode until the VIN voltage is brought
above the VAS voltage by the auto-shutdown hysteresis
value (VHAS). The TC646B/TC649B device will then
resume normal PWM mode operation.
The sink current capability of the FAULT output is listed
in the “Electrical Characteristics Table” of Section 1.0.
4.8
Sensing Fan Operation (SENSE)
The SENSE input is an analog input used to monitor
the fan’s operation (the TC648B device does not incor-
porate the fan sensing feature). It does this by sensing
fan current pulses that represent fan rotation. When a
fan rotates, commutation of the fan current occurs as
the fan poles pass the armatures of the motor. The
commutation of the fan current makes the current
waveshape appear as pulses. There are two typical
current waveforms of brushless DC fan motors,
illustrated in Figures 4-6 and 4-7.
FIGURE 4-6:
Fan Current With DC Offset
And Positive Commutation Current.
FIGURE 4-7:
Fan Current With
Commutation Pulses To Zero.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC649BEPA713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC649BEPATR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC649BEUA | 功能描述:马达/运动/点火控制器和驱动器 w/Rstrt Shtdn & Flt 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 |
| TC649BEUA713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC649BEUATR | 功能描述:马达/运动/点火控制器和驱动器 w/Rstrt Shtdn & Flt 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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