Hitachi A3P-B2 power supply circuit

Published:2011/8/29 3:29:00 Author:TaoXi | Keyword: Hitachi, power supply | From:SeekIC

Oscillation process If you add the voltage which is more than 6V to the pin-9 of STR6709, the switch power supply will start oscillating. The voltage of C907 is about 300V, it adds to the C electrode of the IC901's pin-1 internal switch tube through the P1 and P2 winding resistors, and the 220V AC is rectified by D908, then it is limited by R903 and R917 and filted by C909 to be the unstable DC voltage, this DC voltage adds to the pin-9 of IC901, the switch power supply starts oscillating. After the power supply is started, the induced voltage of V1 and V2 are rectified by D903 to be the 9.5V voltage, and it supplies the power to pin-9 of IC901. Q901 is intended for the power supply of IC901's pin-9 in the standby state.



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