TC642 Datasheet

admin

  TC642 Datasheet

The TC642 is a switch mode fan speed controller for use with brushless DC motors. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input furnishes the required control voltage of 1.25Vto 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 proprietary FanSense™ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, pin 5, indicating normal operation. A missing-pulse detector monitors this pin during normal 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 Shutdown Mode. FAULT is also asserted if the PWM reaches 100%

Parameter Name  Value
Typical Accuracy (°C)  Depends on external thermistor
Over Temp Alert  yes
SM Bus  NO
Predictive Fan Fault  NO
Max. Supply Current (µA)  1000
Max. Accuracy @ 25°C (°C)  Depends on external thermistor
Integrated Temp Sensor  No
Fan Sense  Yes
External Temp Input  Yes
Auto Shutdown  No
Device Description  Fan Manager
Temp Range (°C)  -40 to +85
Vcc Range (V)  +3.0 to +5.5

     Features
Temperature Proportional
Fan Speed for Acoustic Control and Longer Fan Life
Efficient PWM Fan Drive
3.0V 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


推荐MICROCHIP全系列产品推广商：（可申请部分免费样片，资料，大家赶快行动吧！）
授权A级代理商;提供技术支持;提供成熟方案;提供免费样品;提供详细资料！
深圳市英锐恩科技有限公司
联系电话: 0755-88845951 82543411传真：0755-82543511
E-mail: enroo@enroo.com
网址: www.enroo.com （”o”为字母）
公司地址: 福田区深南中路嘉汇新城汇商中心1203-1205
专业为客户提供芯片选型指导、技术咨询、开发工具技术支持、产品开发设计等专业的技术服务。
同时为Microchip全系列芯片代理推广商,分销服务商,专业提供Microchip全系列开发工具及技术支持。