Microchip TC642EOA

Контроллер - Скорость3 В ~ 5,5 В

Overview

The TC642EOA 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 TC642EOA 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 TC642EOA 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%

Features

Applications

• Commercial office
• Hospitality buildings
• Smart lighting applications
• Automotive applications
• Dome
• Dash
• Footwell lighting
• Indicator
• Telltale lights
• Infotainment backlighting