General Specifications
Designed for rotation speed control of single coil DC brushless fans, the FD178 series motor drivers minimize external component count and integrate all the key features required for high efficiency and low noise fans. Specifically PWM control and soft switching are provided to control the rotation speed and reduce the audible noise. Internal circuit protection includes thermal shutdown with hysteresis, rotor lock protection, and reverse power polarity protection. Three frequency generation (FGR pin) options are provided for different fan configurations - FG (FGR signal following Hall sensor output frequency), FG/2 (divided by two version of FG), and RD (rotation detection) for FD178A, FD178B, and FD178C respectively.

FEATUREs and Benefits
• Support single-phase full wave Brushless DC Motor Driver
• Built-in Hall sensor input signal amplifier
• PWM control circuit
• Low voltage startup (VDD=2V)
• High driving capability
• Lock detection and automatic self-restart
• Power polarity reverse protection
• Thermal shut down protection circuit
• Thin, compact, highly reliable package (TSOT-28)