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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC649 Datasheet

PWM Fan Speed Controller

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M
TC649
PWM Fan Speed Controller with Auto-Shutdown
and FanSense™ Technology
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
SOIC/PDIP/MSOP
VIN 1
CF 2
VAS 3
GND 4
TC649
8 VDD
7 VOUT
6 FAULT
5 SENSE
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.
2002 Microchip Technology Inc.
DS21449C-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC649 Datasheet

PWM Fan Speed Controller

No Preview Available !

TC649
Functional Block Diagram
VIN TC649
VDD
CF
VAS
GND
PWM
+ Control
Logic
Clock
Generator
+
+
VSHDN
3 x TPWM
Timer
SHDN
Start-up
Timer
Missing
Pulse
Detect
70mV (typ.)
10k
VOUT
FAULT
SENSE
DS21449C-page 2
2002 Microchip Technology Inc.


Part Number TC649
Description PWM Fan Speed Controller
Maker Microchip
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TC649 Datasheet PDF






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