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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： | 15/17页 |
| 文件大小： | 119K |
| 代理商： | TC649VOART |
7
TC649-2 12/05/00
TC649
2001 Microchip Technology Inc.
DS21449A
PWM Fan Speed Controller with Auto-Shutdown
Normal Operation
Normal Operation is an endless loop which may only be
exited by entering Shutdown Mode or Fan Fault. The loop
can be thought of as executing at the frequency of the
oscillator and PWM.
(1) Reset the Missing Pulse Detector.
(2) Is the TC649 in Shutdown? If so…
a. VOUT duty-cycle goes to zero.
b. FAULT is not activated.
c. Exit the loop and wait for VIN > (VAS + VHAS) to
resume operation.
(3) Drive VOUT to a duty-cycle proportional to VIN on
a cycle by cycle basis.
(4) If a fan pulse is detected, branch back to the start of
the loop (1).
(5) If the missing pulse detector times out…
(6) Activate the 3-cycle Diagnostic Timer and look for
pulses. If a fan pulse is detected, branch back to
the start of the loop (1). If none are received…
(7) Activate the 32-cycle Start-up Timer and look for
pulses. If a fan pulse is detected, branch back to the
start of the loop (1). If none are received…
(8) Quit Normal Operation and go to Fan Fault.
(9) End.
Fan Fault
Fan Fault is essentially an infinite loop wherein the
TC649 is latched in Shutdown Mode. This mode can only
be released by a Reset, i.e., VIN being brought below
VSHDN and then above (VAS + VHAS) or by power-cycling.
(1) While in this state, FAULT is latched on (low), and
the VOUT output is disabled.
(2) A Reset sequence applied to the VIN pin will exit the
loop to Power-Up.
(3) End.
APPLICATIONS INFORMATION
Designing with the TC649 involves the following:
(1) The temperature sensor network must be config-
ured to deliver 1.25V to 2.65V on VIN for 0% to 100%
of the temperature range to be regulated.
(2) The Auto-Shutdown temperature must be set with a
voltage divider on VAS.
(3) The output drive transistor and associated circuitry
must be selected.
(4) The Sense Network, RSENSE and CSENSE, must be
designed for maximum efficiency while delivering
adequate signal amplitude.
(5) If Shutdown capability is desired, the drive require-
ments of the external signal or circuit must be
considered.
The TC642DEMO demonstration and prototyping
board and the TC642EV Evaluation Kit provide working
examples of TC649 circuits and prototyping aids. The
TC642DEMO is a printed circuit board optimized for small
size and ease of inclusion into system prototypes. The
TC642EV is a larger board intended for benchtop develop-
ment and analysis. At the very least, anyone contemplating
a design using the TC649 should consult the documentation
for both, the TC642EV and TC642DEMO.
Temperature Sensor Design
The temperature signal connected to VIN must output a
voltage in the range of 1.25V to 2.65V (typical) for 0% to
100% of the temperature range of interest. The circuit of
Figure 3 is a convenient way to provide this signal.
Figure 3 illustrates a simple temperature-dependent
voltage divider circuit. T1 is a conventional NTC thermistor,
and R1 and R2 are standard resistors. The supply voltage,
VDD, is divided between R2 and the parallel combination of
T1 and R1. For convenience, the parallel combination of
T1 and R1 will be referred to as RTEMP. The resistance of the
thermistor at various temperatures is obtained from the
manufacturer’s specifications. Thermistors are often re-
ferred to in terms of their resistance at 25
°C. A thermistor
with a 25
°C resistance on the order of 100k will result in
reasonable values for R1, R2, and IDIV. In order to determine
R1 and R2, we must specify the fan duty-cycle, i.e. VIN at any
two temperatures. Equipped with these two points on the
system’s operating curve and the thermistor data, we can
write the defining equations:
相关PDF资料 |
PDF描述 |
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| TC649VUATR | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| TC649VOATR | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| TC649EUATR | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| TC655EUNTR | BRUSHLESS DC MOTOR CONTROLLER, PDSO10 |
| TC655EUN | BRUSHLESS DC MOTOR CONTROLLER, PDSO10 |
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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