BA6407AF

Motor driver ICs 2-phase half-wave motor driver BA6407AF The BA6407AF is a motor driver dedicated to 12V fan motors. Built-in output transistors reduce the number of external components required. The IC has a lock signal output pin. FApplications Fan motors FFeatures 1) Lock detection and rotational speed sensing mechanisms are built in. 2) Compact SOP 8-pin package reduces the number of external components required. FAbsolute maximum ratings (Ta = 25_C) 3) Automatic restart when the motor lock is undone. FRecommended operating conditions (Ta = 25_C) 700 Motor driver ICs FBlock diagram BA6407AF FPin descriptions 701 Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 12V) BA6407AF FLock detection The automatic restart circuit detects a motor lock condition and automatically turns off the output current. When the lock condition is cleared, the IC automatically restarts and allow the motor to run. In the BA6407AF, automatic restart is performed as follows. A motor lock condition is detected when the Hall signal stops switching. The output is ON when the LD pin is being charged, and OFF when the pin is being discharged. S The AL pin is ON during normal operation, and OFF when the motor is locked. S The AL pin is an open collector output. Output ON time (TON) and OFF time (TOFF) determined by the LD capacitor C S (VLDCL*VLDCP) TON (Charge time)= ILDC TOFF (Discharge time)= C S (VLDCL*VLDCP) ILDD (Typical value) where C is the cap...