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TPA2001D1 Arkusz danych(PDF) 6 Page - Texas Instruments |
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TPA2001D1 Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 15 page TPA2001D1 1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER SLOS338D – SEPTEMBER 2000 – REVISED DECEMBER 2002 6 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 2. The TPA2001D1 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 TPA2001D1 modulation scheme has very little loss in the load without a filter because the pulses are very 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 cutoff 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. |
Podobny numer części - TPA2001D1_06 |
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Podobny opis - TPA2001D1_06 |
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