BA6811F

Motor driver ICs Fan motor driver IC BA6811F / BA6813F The BA6811F and BA6813F are 2-phase, half-wave motor drivers suited for 12V fan motors. Built-in lock detection and automatic restart mechanisms protect motors. Compact SOP8 (BA6811F / BA6813F) packages reduce the number of external components required. FApplications 2-phase fan motors FFeatures 1) Built-in power transistors. 2) Lock detection and automatic restart mechanisms. 3) Built-in thermal shutdown circuit. FAbsolute maximum ratings (Ta = 25_C) 4) Alarm output pin. (BA6811F) 5) Hall signal output pin. (BA6813F) 6) Built-in reverse current protection diode. FRecommended operating conditions (Ta = 25_C) 712 Motor driver ICs FBlock diagram BA6811F / BA6813F FPin descriptions FHall input / output truth table 713 Motor driver ICs FInput / output equivalent circuits BA6811F / BA6813F FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V) 714 Motor driver ICs FCircuit operation The BA6811F and BA6813F have motor lock detection and automatic restart circuits. The timing of lock detection and automatic restart is determined by the external capacitor connected to the LD pin. The charge time of the external capacitor is given by : C S (VLDCL*VLDCP) TON (Charge time)= ILDC TOFF (Discharge time)= C S (VLDCL*VLDCP) ILDD BA6811F / BA6813F (Typical value) where VLDCL is the LD-pin clamp voltage (1.93V), (0.76V), VLDCP is the LD-pin comparator voltage (2.9µA), ILDC is the LD-pin charge current (0...