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 modulation (PWM). A thermistor (or other voltage output temperature sensor) connected to the VIN input furnishes 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 shutdown 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.

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

TC649E屬于集成電路（IC） > 電機驅(qū)動器，控制器。微芯科技股份有限公司制造生產(chǎn)的TC649E電機驅(qū)動器，控制器產(chǎn)品屬于電機驅(qū)動器和控制器電源管理集成電路 (PMIC) 系列，可用于控制或操作從某電源施加到電機或相關(guān)機電執(zhí)行器的電源。所實現(xiàn)的具體功能和特性集根據(jù)預(yù)期負載和預(yù)期應(yīng)用的特性有很大差異，范圍從用于有刷電機的簡單開環(huán)速度控制到基于步進電機的高級閉環(huán)運動控制。