EUM6270

EUM6270 is a motor driver for single coil brushless DC motor. With its high efficient direct PWM control mode, EUM6270 can control the speed of brushless DC motor. It is an interface between a HALL IC and a single coil motor. EUM6270 is suitable for variable speed control fan of personal computer's power supply radiation and CPU cooler.

The functions built in EUM6270 are PWM control mode, minimum speed mode, fan tachometer, solf switch, lock protection, auto restart, current limit and Hall Bias.

PWM mode controls the internal upper side power device in low noise and low vibration. Minimum speed mode makes the lowest speed of motor settable. If the motor is stalled by external force or obstacles, overdrive current may incur coil overheat/burning. To prevent this, lock protection circuit can shut down the internal power devices for a few seconds after motor lockup. Then auto restart circuit will try to power up these devices. The protection and power up time are settable by external capacitor. When the voltage drop between VCC and VM is bigger than 0.48V (Typ.), the output will be turned off by current limit function. EUM6270 has FG output and Hall bias output.