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TC642B Datasheet(PDF) 1 Page - Microchip Technology |
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TC642B Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 36 page  2002-2013 Microchip Technology Inc. DS21756C-page 1 TC642B/TC647B Features • 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 Applications • Personal Computers & Servers • LCD Projectors • Datacom & Telecom Equipment • Fan Trays •File Servers • General Purpose Fan Speed Control Package Types Description 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. Tempera- ture-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. The TC642B and TC647B also feature Microchip Technology's proprietary 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 TC642B/ TC647B device to turn the VOUT output on full (100% duty cycle). If the fault persists (a fan current pulse is not detected within a 32/f period), the FAULT output goes low. Even with the FAULT output low, the VOUT output is on full during the fan fault condition in order to attempt to restart the fan. FAULT is also asserted if the PWM reaches 100% duty cycle (TC642B only), indicat- ing that maximum cooling capability has been reached and a possible overheating condition exists. The TC642B and TC647B devices are available in 8-pin plastic MSOP, SOIC and PDIP packages. The specified temperature range of these devices is -40 to +85ºC. MSOP, PDIP, SOIC 1 2 3 4 VDD 5 6 7 8 VOUT SENSE VIN CF VMIN GND FAULT TC642B TC647B PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense™ Technology for Fault Detection |
Similar Part No. - TC642B_13 |
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Similar Description - TC642B_13 |
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