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TPA2000D1-Q1 Datasheet(PDF) 9 Page - Texas Instruments |
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TPA2000D1-Q1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page TPA2000D1Q1 2W FILTERLESS MONO CLASSD AUDIO POWER AMPLIFIER SGLS137B− SEPTEMBER 2002 − REVISED SEPTEMBER 2004 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 0 V −5 V +5 V Current OUTP OUTN Differential Voltage Across Load 0 V −5 V +5 V Current OUTP OUTN Differential Voltage Across Load Output = 0 V Output > 0 V Figure 10. The TPA2000D1 Output Voltage and Current Waveforms Into an Inductive Load efficiency: why you must use a filter with the traditional class-D modulation scheme The main reason that the traditional class-D amplifier needs an output filter is that the switching waveform results in maximum current flow. This causes more loss in the load, which causes lower efficiency. The ripple current is large for the traditional modulation scheme because the ripple current is proportional to voltage multiplied by the time at that voltage. The differential voltage swing is 2 × VDD and the time at each voltage is half the period for the traditional modulation scheme. An ideal LC filter is needed to store the ripple current from each half cycle for the next half cycle, while any resistance causes power dissipation. The speaker is both resistive and reactive, whereas an LC filter is almost purely reactive. The TPA2000D1 modulation scheme has little loss in the load without a filter because the pulses are short and the change in voltage is VDD instead of 2 × VDD. As the output power increases, the pulses widen making the ripple current larger. Ripple current could be filtered with an LC filter for increased efficiency, but for most applications, the filter is not needed. An LC filter with a cut-off frequency less than the class-D switching frequency allows the switching current to flow through the filter instead of the load. The filter has less resistance than the speaker that results in less power dissipated, which increases efficiency. |
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