Panasonic KX-TDA0103XJ Service Manual page 56

KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X
4) 41V Output Voltage
4-1) 41V Output
During normal operation FET Q401 is ON. 41V output is connected to the main converter output, and the regulated output
by the main converter is output.Transformer T301 sub-winding voltage of 15V output converter is led to the voltage gate of
Q156, and Q156 is turned ON.
Refer to Fig. 3-4 (A).
4-2) 41V Output Over Current Protection Circuit
When Over Current flows to 41V output, the potential difference between terminals of R180 and R181 occurs causing Q157
to turn ON. Q401 is OFF because the potential difference between the gate and the source disappears. Consequently the
fold back current limiting shuts down 41V output.
Refer to Fig. 3-4 (B).
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