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TC649VPA データシート(PDF) 1 Page - Microchip Technology |
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TC649VPA データシート(HTML) 1 Page - Microchip Technology |
1 / 28 page 2002 Microchip Technology Inc. DS21449C-page 1 M TC649 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 TC649 Supply Voltage - Supports any Fan Voltage • FanSense™ Fault Detection Circuits Protect Against Fan Failure and Aid System Testing • Automatic Shutdown Mode for “Green” Systems • Supports Low Cost NTC/PTC Thermistors • Space Saving 8-Pin MSOP Package Applications • Power Supplies • Computers • File Servers • Portable Computers • Telecom Equipment • UPSs, Power Amps • General Purpose Fan Speed Control Available Tools • Fan Controller Demonstration Board (TC642DEMO) • Fan Controller Evaluation Kit (TC642EV) Package Types General Description The TC649 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 TC649 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. In normal fan operation, a pulse train is present at SENSE (Pin 5). The TC649 features Microchip Technology’s proprietary FanSenseTM technology for increasing system reliability. A missing pulse detector monitors this pin during fan operation. A stalled, open or unconnected fan causes the TC649 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. See Section 5.0, “Typical Applications”, for more information and system design guidelines. The TC649 is available in the 8-pin PDIP, SOIC and MSOP packages and is available in the industrial and extended commercial temperature ranges. SOIC/PDIP/MSOP 18 27 36 45 GND CF VIN VAS FAULT SENSE VDD VOUT TC649 PWM Fan Speed Controller with Auto-Shutdown and FanSense™ Technology |
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同様の説明 - TC649VPA |
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