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TPA032D01 Datasheet(PDF) 14 Page - Texas Instruments |
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TPA032D01 Datasheet(HTML) 14 Page - Texas Instruments |
14 / 25 page TPA032D01 10W MONO CLASSD AUDIO POWER AMPLIFIER SLOS282B − DECEMBER 1999 − REVISED JUNE 2000 14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION the ideal class-D amplifier (continued) Given these plots, the efficiency of the class-D device can be calculated and compared to an ideal linear amplifier device. In the derivation below, a sine wave of peak voltage (VP) is the output from an ideal class-D and linear amplifier and the efficiency is calculated. V L(rms) + V P 2 CLASS-D LINEAR V L(rms) + V P 2 P L + VL I L Average I DD + I L(rms) V L(rms) V DD P L + V L(rms) 2 R L + V P 2 2R L Average I DD + 2 p V P R L P SUP + V DD Average I DD P SUP + V DD Average I DD + V DD VP R L 2 p P SUP + V DD I L(rms) V L(rms) V DD Efficiency + h + P L P SUP Efficiency + h + P L P SUP Efficiency + h + V DD V P 2 2R L 2 p V P R L Efficiency + h + 1 Efficiency + h + p 4 V P V DD In the ideal efficiency equations, assume that VP = VDD, which is the maximum sine wave magnitude without clipping. Then, the highest efficiency that a linear amplifier can have without clipping is 78.5%. A class-D amplifier, however, can ideally have an efficiency of 100% at all power levels. The derivation above applies to an H-bridge as well as a half-bridge. An H-bridge requires approximately twice the supply current but only requires half the supply voltage to achieve the same output power—factors that cancel in the efficiency calculation. The H-bridge circuit is shown in Figure 7. VDD VOUT L CL RL IL IOUT + − VA M2 M1 VDD L CL M4 M3 Figure 7. H-Bridge Class-D Output Stage |
Número de pieza similar - TPA032D01_07 |
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Descripción similar - TPA032D01_07 |
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