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TC646VOA 参数 Datasheet PDF下载

TC646VOA图片预览
型号: TC646VOA
PDF下载: 下载PDF文件 查看货源
内容描述: PWM风扇速度控制器,自动关闭和FanSense⑩技术 [PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology]
分类和应用: 风扇控制器
文件页数/大小: 28 页 / 458 K
品牌: MICROCHIP [ MICROCHIP TECHNOLOGY ]
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M
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 TC646
Supply Voltage
- Supports any Fan Voltage
• FanSense™ Fault Detection Circuits Protect
Against Fan Failure and Aid System Testing
• Shutdown Mode for "Green" Systems
• Supports Low Cost NTC/PTC Thermistors
• Space Saving 8-Pin MSOP Package
• Over-temperature Indication
TC646
Package Types
SOIC/PDIP/MSOP
V
IN
C
F
V
AS
GND
1
2
3
4
8
V
DD
V
OUT
FAULT
SENSE
PWM Fan Speed Controller with Auto-Shutdown
and FanSense
Technology
TC646
7
6
5
General Description
The TC646 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 V
IN
input fur-
nishes the required control voltage of 1.25V to 2.65V
(typical) for 0% to 100% PWM duty cycle. The TC646
automatically suspends fan operation when measured
temperature (V
IN
) is below a user programmed
minimum setting (V
AS
). 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.
The TC646 features Microchip Technology's propri-
etary FanSense™ technology for increasing system
reliability. In normal fan operation, a pulse train is
present at SENSE (Pin 5). A missing-pulse detector
monitors this pin during fan operation. A stalled, open,
or unconnected fan causes the TC646 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. FAULT is also asserted if the PWM
reaches 100% duty cycle, indicating a possible thermal
See Section 5.0, “Typical Applications”, for more
information and system design guidelines.
The TC646 is available in the 8-pin plastic DIP, SOIC
and MSOP packages and is available in the industrial
and extended commercial temperature ranges.
Applications
Power Supplies
Computers
File Servers
Portable Computers
Telecom Equipment
UPS, Power Amps
General Purpose Fan Speed Control
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
2002 Microchip Technology Inc.
DS21446C-page 1