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TC642 bảng dữ liệu(PDF) 1 Page - Microchip Technology |
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TC642 bảng dữ liệu(HTML) 1 Page - Microchip Technology |
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1 / 28 page  2002 Microchip Technology Inc. DS21444C-page 1 M TC642 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 TC642 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 • Personal Computers • File Servers • Telecom Equipment • UPSs, Power Amps, etc. • General Purpose Fan Speed Control Available Tools • Fan Controller Demonstration Board (TC642DEMO) • Fan Controller Evaluation Kit (TC642EV) Package Types General Description The TC642 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. 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 TC642 also features Microchip Technology's pro- prietary 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 TC642 to trigger its Start-up Timer once. If the fault persists, the FAULT output goes low and the device is latched in its shut- down 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 TC642 is available in the standard 8-pin plastic DIP, SOIC and MSOP packages and is available in the commercial, extended commercial and industrial temperature ranges. 18 27 36 45 TC642 GND CF VIN VMIN FAULT SENSE VDD VOUT SOIC/PDIP/MSOP PWM Fan Speed Controller with FanSense™ Technology |
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