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TPA2000D1 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPA2000D1 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 22 page APPLICATION INFORMATION Eliminating the Output Filter With the TPA2000D1 Effect on Audio Traditional Class-D Modulation Scheme O V −5 V +5 V Current OUTP Differential Voltage Across Load OUTN TPA2000D1 Modulation Scheme TPA2000D1-Q1 www.ti.com ........................................................................................................................................ SGLS137E – SEPTEMBER 2002 – REVISED OCTOBER 2008 This section explains why the user can eliminate the output filter with the TPA2000D1. The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are much greater than 20 kHz, so the only signal heard is the amplified input audio signal. The traditional class-D modulation scheme, which is used in the TPA005Dxx family, has a differential output where each output is 180 degrees out of phase and changes from ground to the supply voltage, VDD. Therefore, the differential pre-filtered output varies between positive and negative VDD, where filtered 50% duty cycle yields 0 V across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown in Figure 9. Even at an average of 0 V across the load (50% duty cycle), the current to the load is high, causing high loss, thus causing a high supply current. Figure 9. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an Inductive Load With No Input The TPA2000D1 uses a modulation scheme that still has each output switching from 0 to the supply voltage. However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater than 50% and OUTN is less than 50% for positive voltages. The duty cycle of OUTP is less than 50% and OUTN is greater than 50% for negative voltages. The voltage across the load sits at 0 V throughout most of the switching period, greatly reducing the switching current, which reduces any I2R losses in the load. Copyright © 2002–2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TPA2000D1-Q1 |
Numéro de pièce similaire - TPA2000D1 |
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Description similaire - TPA2000D1 |
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