LB1668 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LB1668

Monolithic Digital IC Two-Phase Unipolar Drive Brushless Motor Drivers

SANYO -> Panasonic 

LB1668, LB1668M, LB1667, LB1667M

Automatic Recovery 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.

No. 4944-6/7

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