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DTC646 Datasheet(PDF) 1 Page - Microchip Technology |
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DTC646 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 30 page  2002-2012 Microchip Technology Inc. DS21446D-page 1 DTC646 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 • FanSense™ 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 • Computers •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 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 mod- ulation (PWM). A thermistor (or other voltage output temperature sensor) connected to the VIN input fur- nishes the required control voltage of 1.25V to 2.65V (typical) for 0% to 100% PWM duty cycle. The TC646 automatically suspends fan operation when measured temperature (VIN) is below a user programmed minimum setting (VAS). An integrated Start-up Timer ensures reliable motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode or following a transient fault. The TC646 features Microchip Technology's proprie- tary FanSense™ technology for increasing system reli- ability. 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 uncon- nected fan causes the TC646 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. FAULT is also asserted if the PWM reaches 100% duty cycle, indicating a possible thermal runaway situation, although the fan continues to run. See Section 5.0, “Typical Applications”, for more information and system design guidelines. The TC646 is available in the 8-pin plastic DIP, SOIC and MSOP packages and is available in the industrial and extended commercial temperature ranges. 18 27 36 45 TC646 GND CF VIN VAS FAULT SENSE VDD VOUT SOIC/PDIP/MSOP PWM Fan Speed Controller with Auto-Shutdown and FanSense™ Technology |
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