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TC647VOA

Description
PWM Fan Controller
File Size369KB,28 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
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TC647VOA Overview

PWM Fan Controller

TC647VOA Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Minimum Operating Supply Voltage (V)3
Maximum Operating Supply Voltage (V)5.5
Maximum Operating Supply Current (mA)1
Control MethodPWM
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)85
Minimum Storage Temperature (°C)-65
Maximum Storage Temperature (°C)150
Number of Supported Fans1
Over Temperature AlertNo
System ShutdownYes
MountingSurface Mount
Package Height1.25(Min)
Package Length4.9
Package Width3.9
PCB changed8
Standard Package NameSOP
Supplier PackageSOIC N
Pin Count8
Lead ShapeGull-wing
TC647
PWM Fan Speed Controller with 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 TC647
Supply Voltage
- Supports any Fan Voltage
• FanSense™ Technology 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
Package Types
SOIC/PDIP/MSOP
V
IN
C
F
V
MIN
GND
1
2
3
4
8
V
DD
V
OUT
FAULT
SENSE
TC647
7
6
5
General Description
The TC647 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 V
IN
furnishes the
required control voltage of 1.25V to 2.65V (typical) for
0% to 100% PWM duty cycle. Minimum fan speed is
set by a simple resistor divider on the V
MIN
input. An
integrated Start-up Timer ensures reliable motor start-
up at turn-on, coming out of shutdown mode or
following a transient fault. A logic low applied to V
MIN
(Pin 3) causes fan shutdown.
The TC647 also features Microchip Technology's pro-
prietary FanSense™ technology for increasing system
reliability. In normal fan operation, a pulse train is pres-
ent at SENSE (Pin 5). A missing pulse detector moni-
tors this pin during fan operation. A stalled, open or
unconnected fan causes the TC647 to trigger its Start-
up Timer once. If the fault persists, the FAULT output
goes low and the device is latched in its shutdown
mode.
The TC647 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
Personal Computers
File Servers
Telecom Equipment
UPSs, Power Amps
General Purpose Fan Speed Control
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
2001-2012 Microchip Technology Inc.
DS21447D-page 1

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