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LB1668M Folha de dados(PDF) 7 Page - ON Semiconductor |
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LB1668M Folha de dados(HTML) 7 Page - ON Semiconductor |
7 / 8 page LB1668, 1668M No.4944-7/8 Automatic Recovery Circuit C-pin Voltage Automatic return circuit C pin voltage 1) While the blades are turning, the capacitor is charged with a current of about 3 μA (typical), and C is discharged by pulses that correspond to the motor speed. 2) When the blades lock, the capacitor is no longer discharged, and the voltage across the capacitor increases. The output is turned off when that voltage reaches 0.8 × VIN. 3) When the output is turned off, the capacitor is discharged at about 0.44 μA (typical). When the capacitor voltage falls under VTH2, if the lock state is not yet cleared the capacitor continues discharging until VTH1. (Note that the output is turned on at this time.) These operations, i.e. items 2. and 3., are repeated with a ton:toff ratio of about 1 : 6 to protect the motor. 4) If the lock is cleared at the point the capacitor voltage reaches VTH2, motor rotation is started by turning the output on. 0 1 2 3 4 5 6 VTH2 VTH1 01 t3 23456789 10 11 12 13 14 15 16 17 t2 t1 1 t (s) Output on Lock Output off Output on Rotation Rotation Lock released 2 Output off 0 0.4 0.8 1.2 1.6 2.0 0.1 2 3 5 7 1.0 2 0 0.4 0.2 0.6 0.8 1.0 1.2 1.4 10 35 7 2 3 5 7 1.6 Output current, IO –mA 0 2 4 6 8 10 02 4 6 8 10 12 Input current, ICC –mA 2 100 Collector/emitter voltage, VCE –V VO(sat) – IO ASO VIN – ICC Ta = 80 °C Single pulse VIN = 6.7V 300 μs 400 μs 500 μs IN+ = L |
Nº de peça semelhante - LB1668M |
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Descrição semelhante - LB1668M |
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