CMD1667M Ceramate Technical, CMD1667M Datasheet - Page 8

• Manufacturer Part Number: CMD1667M
• Description: Two-phase Unipolar Drive Brushless Motor Drivers
• Manufacturer: Ceramate Technical

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
2. When the blades lock, the capacitor is no longer discharged, and the voltage across the capacitor increases. The
3. When the output is turned off, the capacitor is discharged at about 0.44 µA (typical). When the capacitor voltage falls
4. If the lock is cleared at the point the capacitor voltage reaches V
* All specs and applications shown above subject to change without prior notice.
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pulses that correspond to the motor speed.
output is turned off when that voltage reaches 0.8 V
under V
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.
on.
TH
Two-Phase Unipolar Drive Brushless Motor Drivers
2, if the lock state is not yet cleared the capacitor continues discharging until V
CMD1668M,CMD1667M
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IN
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2, motor rotation is started by turning the output
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TH
1. (Note that the output is
Rev 1.0 Aug. 23, . 2004