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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC646 Datasheet

PWM Fan Speed Controller

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TC646 pdf
M
TC646
PWM Fan Speed Controller with Auto-Shutdown
and FanSenseTechnology
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
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)
Package Types
SOIC/PDIP/MSOP
VIN 1
CF
VAS
2
3
GND 4
TC646
8 VDD
7 VOUT
6 FAULT
5 SENSE
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 VIN 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 (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.
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
runaway situation, although the fan continues to run.
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.
2002 Microchip Technology Inc.
DS21446C-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC646 Datasheet

PWM Fan Speed Controller

No Preview Available !

TC646 pdf
TC646
Functional Block Diagram
VIN
CF
VAS
GND
+
VOTF
OTF
PWM
+ Control
Logic
Clock
Generator
+
+
VSHDN TC646
3 x TPWM
Timer
SHDN
Start-up
Timer
Missing
Pulse
Detect.
70mV (typ.)
10k
VDD
VOUT
FAULT
SENSE
DS21446C-page 2
2002 Microchip Technology Inc.


Part Number TC646
Description PWM Fan Speed Controller
Maker Microchip
Total Page 28 Pages
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