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KX-MB1520FX7/KX-MB1520FX8/KX-MB1520FXW/KX-MB1530FX7/KX-MB1530FXW
4. Timing chart of current control
Following timing charts are the example of Vref voltage corresponding to PWM pulse duty.
6.7.2.3.
O.C.P (Over Current Protection) circuit
1. Function
If motor driver can supply more than 15 watts, FB motor may become fire hazards.
To prevent the risk of fire, this circuit is provided.
2. Circuit Diagram
3. Circuit explanation
When the current supplied from 24V exceeds 0.44A, the voltage between two registers R575 and R578 becomes more than
0.6V (=0.44A*2.7ohm/2), consequently both Q515 and Q522 turn on.
If Q522 turns on, IC502_pin20 becomes "Low" level.
As a result IC502 is deactivated and motor currents are cut off.
So the current which IC502 can supply is limited to less than 0.44A and the wattage is also limited to less than 10.7W
(=0.44A*24V).
By limiting the wattage less than 15W, risk of fire hazard is eliminated.
Summary of Contents for KX-MB1520FX7
Page 52: ...52 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 6 10 3 5 Waveform ...
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Page 175: ...175 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW Toner detection flow ...
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Page 218: ...218 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 14 10 How to Remove LVPS ...
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Page 255: ...255 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 15 6 1 NG Example ...
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