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ManufacturerMicrochip
SeriesTC642B
Part NumberTC642BEOA

The TC642B is a new version of the existing TC642 fan speed controller

Datasheets

  • Download » Datasheet, PDF, 549 Kb, 02-05-2013
    TC642B/TC647B data sheet
    Docket ↓
    TC642B/TC647B
    PWM Fan Speed Controllers With Minimum Fan Speed,
    Fan Restart and FanSense™ 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 TC642B/TC647B
    Supply Voltage
    -Supports any Fan Voltage FanSense™ Fault Detection Circuit Protects
    Against Fan Failure and Aids System Testing Shutdown Mode for "Green" Systems Supports Low Cost NTC/PTC Thermistors Over-Temperature Indication (TC642B only) Fan Auto-Restart Space-Saving 8-Pin MSOP Package The TC642B/TC647B devices are new versions of the
    existing TC642/TC647 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. Minimum fan
    speed is set by a simple resistor divider on the VMIN
    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 VMIN (pin 3) causes fan shutdown. Applications Personal Computers & Servers
    LCD Projectors
    Datacom & Telecom Equipment ...

Prices

Status

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

Packaging

PackageSOIC
Pins8

Parametrics

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

RoHSCompliant

Other Options

TC647B

Moldel Line

Series: TC642B (5)

Manufacturer's Classification

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