TC647VOA

The TC647VOA from Microchip Technology is a specialized integrated circuit designed for controlling the speed of brushless DC fans. It employs pulse width modulation (PWM) to achieve temperature-proportional fan speed control, which aids in acoustic management and extends fan lifespan. The device supports a wide supply voltage range of 3.0V to 5.5V, with the fan voltage being independent of the TC647 supply voltage, allowing compatibility with various fan types.

Key features include Microchip's proprietary FanSense™ technology, which provides fault detection circuits to protect against fan failure and assist in system testing. It also incorporates a shutdown mode for energy-efficient 'green' systems and supports low-cost NTC/PTC thermistors for temperature sensing. The TC647VOA is designed for reliable motor start-up with an integrated start-up timer, ensuring proper operation during power-up, after shutdown, or following transient faults. A logic low on the V MIN input can initiate fan shutdown.

This controller is housed in a space-saving 8-pin SOIC package, suitable for surface mount applications. Its applications span across power supplies, personal computers, file servers, telecom equipment, UPSs, and power amplifiers, making it a versatile solution for general-purpose fan speed control where acoustic performance and system reliability are critical.