D类音频功率放大器设计与实践

13/2009/7/12/014DH(1)110125kHzPWMH78%(10W)P1110+5V-5V20Hz50kHz200mVp-pRi=9.78kR1052c2003125kHzVop-p3.2V:fo=R202/(4xR203xR204xC200):Vop-p=2xR203xVz/R202VzIC20ADPWMLM311+5V-5V0.4s0.1sVop-p=7.8V4CD4069H15VCDVop-p=10VH5Vc=+4VVD=-4V,V400Vgs=-1VV401Vgs=9VV402Vgs=-9VV403Vgs=1V+5VV402RLV401-5VVC=-4VD=+4VV400Vgs=-9VV401Vgs=1VV402Vgs=-1VV403Vgs=9V+5VV400RLV403-5VHVMOSR400R401NIRF540DSPIRF9540SD6ViVo:Vo=1/jwc/jw1+1/jwcVi=1/1-w2IcVi:Vo=1/Ic:Vo=1/1-W2/Wo2ViW2/Wo21VoQViW2/Wo21VoW40dB/7175HQ23.9100nFf0=38kHzD238AB()R300R303R3043504HCD4069CD(4)HAB(5)CD4069HCD40692.25mAIRF540890pF,125kHz4s1VCD40699x10-9IRF54010.01V80508550CD406950112.5mA79.1ns10VD33