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LB1863M Arkusz danych(PDF) 5 Page - Sanyo Semicon Device |
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LB1863M Arkusz danych(HTML) 5 Page - Sanyo Semicon Device |
5 / 6 page No. 4943-5/6 LB1863M/LB1869M 4. Output protection function (C pin) This pin connects the capacitor that forms the automatic recovery circuit. If rotation stops due to, for example, a motor overload, the pin voltage rises and the output stops. The system automatically recovers from stopped to drive mode when the load is set to an appropriate level. The lock detection time can be set by changing the value of the capacitor. For a 1-μF capacitor:Lock detection time About 2 seconds Lock protection time (output on) About 1 second (output off) About 6 seconds ➀While 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. ➁When 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. ➂When the output is turned off, the capacitor is discharged at a current of 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 ➁ and ➂, are repeated with a ton:toff ratio of about 1:6 to protect the motor. ④If the lock state has been cleared when the capacitor voltage reaches VTH2, motor rotation is started by turning the output on. 5. Rotation detection signal (RD pin) This is an open collector output, and outputs a low level in drive mode and a high level when the motor is stopped. 6. Radio-frequency noise reduction function (B1 and B2 pins) These are base pins for Darlington pair outputs. Add capacitors of about 0.01 to 0.1 μF if radio-frequency noise is a problem. 7. Thermal shutdown function Turns off the output in response to coil shorting or IC overheating. Automatic recovery circuit pin C voltage |
Podobny numer części - LB1863M_09 |
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Podobny opis - LB1863M_09 |
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