BA6845FS

Motor driver ICs Stepping motor driver BA6845FS The BA6845FS is a stepping motor driver with a maximum output current of 1.0A. The logic input allows three output modes : forward, reverse, and power save. The IC has a low output saturation voltage and is capable of driving motors at low supply voltage. FApplications Stepping motors for floppy disk drives FFeatures 1) Low output saturation voltage. 2) Power save circuit. 3) Thermal shutdown circuit. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 735 Motor driver ICs FBlock diagram BA6845FS 736 Motor driver ICs FPin descriptions BA6845FS FInput / output circuits (all resistances are typical values) 737 Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) BA6845FS FTruth table 738 Motor driver ICs FApplication example BA6845FS FOperation notes (1) Control logic pins Do not apply voltage to control logic pins (pins 4, 5, 12, and 13) when the VCC voltage is not applied to the IC. The voltage of each pin should be less than VCC, if applied, and should be more than the ground voltage. (2) PCB arrangement When changing the rotational direction of a motor, a large current of up to a few hundred milliamperes can flow between the motor power supply (pins 11 and 14) and MGND (pins 1 and 8). Depending on the application, this large output current may flow back to input pins, resulting in output oscillation or other malfunctions. Make sure that your...