The TC665 is a single PWM mode fan speed controller with FanSense TM technology for use with brush-less DC motors. The device allows temperature proportional speed control and therefore accomplishes lower acoustic fan noise and longer fan The TC664 is a single PWM mode fan speed controller with FanSense TM technology for use with brush-less DC motors. The device allows temperature proportional speed control and therefore accomplishes lower acoustic fan noise and longer fan SMBus PWM Fan Speed Controllers With Fan Fault Detection SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection