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AN2583 数据表(PDF) 9 Page - STMicroelectronics |
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AN2583 数据表(HTML) 9 Page - STMicroelectronics |
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9 / 18 page  AN2583 Audio characteristics 9/18 Figure 9. Simple amplifier outputs waveforms The average or continuous power to a resistive load, R, for a sinusoidal signal, is This shows the power calculation using both the peak voltage VPK and the peak-to-peak voltage VPP . For the circuit in Figure 7, the expression becomes At maximum swing, VL-PK equals VDD/2, so the maximum continuous power to the load is Equation 1 Thus, for the topology in Figure 7, the power to the load is a function VDD and RL. To get more power to the load, the user must increase VDD or decrease RL, or use a different circuit topology. 0 VDD / 2 VDD VX VXPP VDD / 2 0 VDD / 2 VL VX-PK VLPP VL-PK ai13935 R 8 V R 2 V P 2 PP 2 PK AV = = L 2 PP - L L 2 PK - L AV - L R 8 V R 2 V P = = () L 2 DD L 2 DD L 2 PK - L max - AV - L R 8 V R 2 2 / V R 2 V P = = = |
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