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參數資料
| 型號： | TC649VUATR |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數： | 1/28頁 |
| 文件大小： | 478K |
| 代理商： | TC649VUATR |
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2002 Microchip Technology Inc.
DS21449C-page 1
M
TC649
Features
Temperature Proportional Fan Speed for Acoustic
Control and Longer Fan Life
Efficient PWM Fan Drive
3.0V to 5.5V Supply Range:
- Fan Voltage Independent of TC649
Supply Voltage
- Supports any Fan Voltage
FanSense Fault Detection Circuits Protect
Against Fan Failure and Aid System Testing
Automatic Shutdown Mode for “Green” Systems
Supports Low Cost NTC/PTC Thermistors
Space Saving 8-Pin MSOP Package
Applications
Power Supplies
Computers
File Servers
Portable Computers
Telecom Equipment
UPSs, Power Amps
General Purpose Fan Speed Control
Available Tools
Fan Controller Demonstration Board (TC642DEMO)
Fan Controller Evaluation Kit (TC642EV)
Package Types
General Description
The TC649 is a switch mode, fan speed controller for
use with brushless DC fans. Temperature proportional
speed control is accomplished using pulse width mod-
ulation (PWM). A thermistor (or other voltage output
temperature sensor) connected to the VIN input fur-
nishes the required control voltage of 1.25V to 2.65V
(typical) for 0% to 100% PWM duty cycle. The TC649
automatically suspends fan operation when measured
temperature (VIN) is below a user programmed
minimum setting (VAS). An integrated Start-up Timer
ensures reliable motor start-up at turn-on, coming out
of shutdown mode, auto-shutdown mode or following a
transient fault.
In normal fan operation, a pulse train is present at
SENSE (Pin 5). The TC649 features Microchip
Technology’s proprietary FanSenseTM technology for
increasing system reliability. A missing pulse detector
monitors this pin during fan operation. A stalled, open
or unconnected fan causes the TC649 to trigger its
Start-up Timer once. If the fault persists, the FAULT
output goes low, and the device is latched in its shut-
down mode. See Section 5.0, “Typical Applications”,
for more information and system design guidelines.
The TC649 is available in the 8-pin PDIP, SOIC and
MSOP packages and is available in the industrial and
extended commercial temperature ranges.
SOIC/PDIP/MSOP
18
27
36
45
GND
CF
VIN
VAS
FAULT
SENSE
VDD
VOUT
TC649
PWM Fan Speed Controller with Auto-Shutdown
and FanSense Technology
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