Power Control Circuit When Computer Mainboard Is Started

Published:2011/7/20 7:40:00 Author:Sue | Keyword: Power Control, Computer Mainboard, Started | From:SeekIC

Starting Principle: Before the power switch is pushed, PS-ON signal is pulled high by 5VSB voltage and will remain high level. PS-ON signal is P4 POWER's working control signal and when it is high level, P4 POWER doesn't work. When the switch is pushed, there will be a PWRBT# signal which will be sent to south bridge. The SLP-S3# signal output by south bridge is high level, which will control the triode Q33 to be connected. Then PS-ON signal of high level will be pulled low. PS-ON signal of low level will control POWER to output other working voltages 12V, -12V, -5V, VCC, VCC3.



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