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③脚输出的PWM(脉宽调制)脉冲经R8112限流后,加在由Q8019(C3209)、Q8020(A1281)组成的互补推挽电路的b极上,推动Q8004(W20NM50)进入开关状态。同时,从U8011的⑩脚输出倒相后的PWM信号加到由Q8009、Q8017组成的互补推挽电路的b极上,推挽输出的信号经C8009隔直后,加在T8005的初级绕组上。T8005的次级感应出相应的脉冲经D8014、R8120、Q8021(A1281)、C8091、R8121、R8043加在Q8003(W20NMS0)的栅极,推动Q8003进入开关工作状态。
(3) The PWM (Pulse Width Modulation) pulse output by the pin is limited by R8112 and added to the b pole of the complementary push-pull circuit composed of Q8019 (C3209) and Q8020 (A1281) to push Q8004 (W20NM50) into the switch state. At the same time, from the U8011 ⑩ pin output inverted PWM signal added to Q8009, Q8017 composed of complementary push-pull circuit b pole, push-pull output signal by C8009 cut off, added to the T8005’s primary winding. T8005 secondary induction of the corresponding pulse by D8014, R8120, Q8021 (A1281), C8091, R8121, R8043 added to the Q8003 (W20NMS0) of the grid to promote Q8003 into the switch state.