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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： | 12/17页 |
| 文件大小： | 119K |
| 代理商： | TC649VOART |
4
TC649-2 12/05/00
TC649
PWM Fan Speed Controller with Auto-Shutdown
2001 Microchip Technology Inc.
DS21449A
Figure 1. Typical Application Circuit
DETAILED DESCRIPTION
PWM
The PWM circuit consists of a ramp generator and
threshold detector. The frequency of the PWM is determined
by the value of the capacitor connected to the CF Pin. A
frequency of 30Hz is recommended for most applications
(CF = 1.0
F). The PWM is also the timebase for the Start-up
and Fault Timer (see paragraphs below). The PWM voltage
control range is 1.25V to 2.65V (typical) for 0% to 100%
output duty cycle.
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
below. This output has an asymmetric complementary drive
and is optimized for driving NPN-transistors or N-channel
MOSFETs. Since the system relies on PWM rather than
linear power control, the dissipation in the power switch is
kept to a minimum. Generally, very small devices (TO-92 or
SOT packages) will suffice.
Start-Up Timer
Whenever the fan is started from the off state, the Start-
up Timer turns the VOUT output on for 32 PWM cycles to
ensure reliable fan start-up. This occurs at power-up and
when coming out of Shutdown or Auto-Shutdown modes. If
the PWM frequency is 30Hz (CF = 1
F) the resulting start-up
time will be about one second. If a fan fault is detected (see
below), the Diagnostic Timer is triggered once followed by
the Start-up Timer. If the fault persists, the device is shut-
down. See FAULT Output below.
SENSE Inputs
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 interrup-
tions in the fan current, seen as pulses across the sense
resistor. If the device is not in Shutdown or Auto-Shutdown
modes, and pulses are not appearing at the SENSE input,
a fault exists.
The short, rapid change in fan current (high dl/dt)
FAULT
SENSE
NTC
R1
R2
R3
R4
GND
*See cautions regarding Latch-up Considerations in the Applications section.
**Optional. See the Applications section for details.
NOTES:
FAN FAULT
SHUTDOWN
SHUTDOWN**
Q1
+12V
+5V*
VDD
VIN
VAS
VOUT
RBASE
RSENSE
CSENSE
CF
1
F
CF
TC649
FAN
CB
0.01
F
CB
0.01
F
1
F
+
4
5
7
6
8
1
3
2
+5V
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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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