GC5845三相无传感器正弦波180度 风扇驱动器  替代Allegro A4945 瑞盟MS39545

Chip description：
The GC5845 and GC5849 is a three phase motor driver incorporate sinusoidal drive to minimize audible noise and vibration for medium power fans. A speed input is provided to control motor speed. This allows system cost savings by eliminating an external variable power supply.
Alternatively, power supply modulation down to 4 V can be used to adjust motor speed。

Chip features：
 180° sinusoidal drive for low audible noise
 High efficiency control algorithm Support
 Sensorless operation
 Analog speed input (GC5845)
 PWM speed input (GC5849)
 Wide supply voltage range: 4~20V
 FG speed output
 Lock detection
 Thermal breakdown protection,
Over current protection，
Short circuit protection
 Soft start
 eSOP8 Package

Chip application：
 CPU cooling Fans
 VGA cooling Fans
 Water Pump Motor

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