Electronics ru
Advanced Search +

Part NumberTC646BEPA

The TC646B is a new version of the existing TC646 fan speed controller


  • Download » Datasheet PDF, 566 Kb, File published: Feb 5, 2013
    TC646B/TC648B/TC649B Datasheet
    Docket ↓
    PWM Fan Speed Controllers With Auto-Shutdown, Fan
    Restart and FanSenseв„ў Technology for Fault Detection
    Features Description Temperature-Proportional Fan Speed for Acoustic
    Noise Reduction and Longer Fan Life Efficient PWM Fan Drive 3.0V to 5.5V Supply Range:
    -Fan Voltage Independent of TC646B/
    TC648B/TC649B Supply Voltage
    -Supports any Fan Voltage FanSenseв„ў Fault Detection Circuit Protects
    Against Fan Failure and Aids System Testing
    (TC646B/TC649B) Automatic Shutdown Mode for “Green” Systems Supports Low Cost NTC/PTC Thermistors Over-Temperature Indication (TC646B/TC648B) Fan Auto-Restart Space-Saving 8-Pin MSOP Package The TC646B/TC648B/TC649B devices are new versions of the existing TC646/TC648/TC649 fan speed
    controllers. These devices are switch-mode fan speed
    controllers that incorporate a new fan auto-restart function. Temperature-proportional speed control is accomplished using pulse width modulation. A thermistor (or
    other voltage output temperature sensor) connected to
    the VIN input supplies the required control voltage of
    1.20V to 2.60V (typical) for 0% to 100% PWM duty
    cycle. The auto-shutdown threshold/temperature is set
    by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor startup at turn-on, coming out of shutdown mode, autoshutdown mode or following a transient fault. A logic
    low applied to VIN (pin 1) causes fan shutdown. Applications Personal Computers & Servers
    LCD Projectors
    Datacom & Telecom Equipment
    Fan Trays
    File Servers
    General-Purpose Fan Speed Control Package Types ...



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 Current400 µA
Operating Temperature Range-40 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


Other Options

TC648B TC649B

Moldel Line

Series: TC646B (5)

Manufacturer's Classification

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

Related datasheets:

Slices ↓
Radiolocman facebook Radiolocman twitter Radiolocman google plus