Read Panasonic KX-UT670RU Service Manual online
10
KX-UT670RU
4.2.3.
3.3V
→ VDDP, VGH
VDDP(5.6V) voltage is generated with the DCDC step-up converter circuit from 3.3V.
IC304 operates so that the voltage of FB may become 200mV.
VGH(15.5 - 21.5V) is generated by the booster circuit of Voltage doubler rectifier circuit.
IC304 operates so that the voltage of FB may become 200mV.
VGH(15.5 - 21.5V) is generated by the booster circuit of Voltage doubler rectifier circuit.
4.2.4.
5V
→ VGL, VDDN
VGL(A minus voltage) is generated by replacing the output of the step-down convertor with GND.
VDDN is generated from VGL with the constant voltage circuit.
VDDN is generated from VGL with the constant voltage circuit.
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