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TC646VOA Datasheet

  • TC646VOA

  • PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ T...

  • 28頁

  • MICROCHIP   MICROCHIP

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M
Features
鈥?Temperature Proportional Fan Speed for Acoustic
Control and Longer Fan Life
鈥?Efficient PWM Fan Drive
鈥?3.0V to 5.5V Supply Range:
- Fan Voltage Independent of TC646
Supply Voltage
- Supports any Fan Voltage
鈥?FanSense鈩?Fault Detection Circuits Protect
Against Fan Failure and Aid System Testing
鈥?Shutdown Mode for "Green" Systems
鈥?Supports Low Cost NTC/PTC Thermistors
鈥?Space Saving 8-Pin MSOP Package
鈥?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
鈩?/div>
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鈩?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
runaway situation, although the fan continues to run.
See Section 5.0, 鈥淭ypical Applications鈥? 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
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Power Supplies
Computers
File Servers
Portable Computers
Telecom Equipment
UPS, Power Amps
General Purpose Fan Speed Control
Available Tools
鈥?Fan Controller Demonstration Board (TC642DEMO)
鈥?Fan Controller Evaluation Kit (TC642EV)
錚?/div>
2002 Microchip Technology Inc.
DS21446C-page 1

TC646VOA 產品屬性

  • 100

  • 集成電路 (IC)

  • PMIC - 電機和風扇控制器，驅動器

  • -

  • 風扇控制器，無刷（BLDC）

  • -

  • 1

  • -

  • -

  • 3 V ~ 5.5 V

  • 0°C ~ 85°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOICN

  • 管件

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