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BA6819AF Datasheet(PDF) 4 Page - Rohm |
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BA6819AF Datasheet(HTML) 4 Page - Rohm |
4 / 6 page 709 Motor driver ICs BA6809F / BA6819AF FCircuit operation The BA6809F and BA6819AF have motor lock detection and automatic restart circuits. The timing of lock detec- tion and automatic restart is determined by the external capacitor connected to the LD pin. The charge time of the external capacitor is given by : (Typical value) where VLDCL is the LD-pin clamp voltage (1.90V), VLDCP is the LD-pin comparator voltage (0.73V), ILDC is the LD-pin charge current (2.2 µA), ILDD is the LD-pin discharge current (0.42 µA), C is the capacitance of the LD-pin external capacitor. For C=0.47 µF, for example, the charge and discharge times are 0.25s (output ON) and 1.31s (output OFF), re- spectively. FApplication example ILDC ton (Charge time)= C S (VLDCL*VLDCP) ILDD toff (Discharge time)= C S (VLDCL*VLDCP) |
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