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TS4909 数据表(PDF) 24 Page - STMicroelectronics |
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TS4909 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 32 page  Application information TS4909 24/32 4.4 Power dissipation and efficiency Hypotheses: ● Voltage and current (Vout and Iout) in the load are sinusoidal. ● Supply voltage (VCC) is a pure DC source. Regarding the load we have: and and 4.4.1 Single-ended configuration The average current delivered by the power supply voltage is: Figure 80. Current delivered by power supply voltage in single-ended configuration The power delivered by the power supply voltage is: Therefore, the power dissipation by each power amplifier is and the maximum value is obtained when: V OUT V PEAK ωtV () sin = I OUT V OUT R L -------------- A () = P OUT V PEAK 2 2R L ----------------- A () = Icc AVG 1 2 π ------ V PEAK R L ----------------- t () sin t d 0 π ∫ V PEAK πR L ----------------- A () == Icc (t) Time T/2 T Icc AVG Vpeak/R L 03T/2 2T P supply V CCICC AVG W () = P diss P supply POUT W () – = P diss 2VCC π R L ------------------- P OUT P OUT W () – = P OUT ∂ ∂P diss 0 = |
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