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4V Power Supply descriptions
• IC901 is PWM type DC-DC converter with MOSFET, which make up step down type DC-DC converter circuit with coil of L905 ,
schottky diode of D900,Capacitor of C978.
The oscillation frequency in operation of this DC-DC converter is set to about 1.25MHz.
• R978,R979,R980,R981,Q907,Q908 are UVLO (Under Voltage Lock Out) circuit.
Q907 turns on when 3.3V output voltage is about 2.5V or less and CE terminal becomes low so that IC901's operation is
stopped.
2.5V Power Supply descriptions
• IC900 is adjustable regulator and the output voltage is adjusted 2.5V with external resistors R975 and R976.
81
KX-MB2061CXB/KX-MB2061CX2/KX-MB2062CXB
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Troubleshooting
