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Part NumberTC646VUA

The TC646 is a switch mode fan speed controller for use with brushless DC motors


  • Download » Datasheet PDF, 378 Kb, File published: Feb 5, 2013
    TC646 Datasheet
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    PWM Fan Speed Controller with Auto-Shutdown
    and FanSenseв„ў 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 TC646
    Supply Voltage
    -Supports any Fan Voltage FanSenseв„ў 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
    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
    VIN 1 CF 2 VAS
    GND 8 VDD 7 VOUT 3 6 FAULT 4 5 SENSE TC646 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 modulation (PWM). A thermistor (or other voltage output
    temperature sensor) connected to the VIN input furnishes the required control voltage of 1.25V to 2.65V
    (typical) for 0% to 100% PWM duty cycle. The TC646 ...



Lifecycle StatusProduction (Appropriate for new designs but newer alternatives may exist)




Auto shutdownYes
DescriptionFan Manager
External Temp InputYes
Fan Speed TableNo
FanSense fan monitorYes
High/Low PWM FreqLow
Integrated temp sensorNo
Max. Accuracy @ 25°Depends on external thermistor °
Max. Supply Current1000 µA
Operating Temperature Range0 to +85 °C
Over temp alertYes
Predictive fan fault detection/read/RPMNo
SMBus compatible interfaceNo
Temp. Range-40 - +85 °
Typical AccuracyDepends on external thermistor °
Vcc Range+3.0 - +5.5 V

Eco Plan


Moldel Line

Series: TC646 (9)

Manufacturer's Classification

  • Thermal Management > Fan Controllers > Open Loop Fan Controllers and Fault Detectors

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