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TPA3007D1PW Arkusz danych(PDF) 11 Page - Texas Instruments |
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TPA3007D1PW Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 20 page www.ti.com 0 V –12 V +12 V Current OUTP Differential Voltage Across Load OUTN TPA3007D1 MODULATION SCHEME TPA3007D1 SLOS418A – SEPTEMBER 2003 – REVISED DECEMBER 2004 APPLICATION INFORMATION (continued) Figure 14. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an Inductive Load With No Input The TPA3007D1 uses a modulation scheme that still has each output switching from ground to VCC. 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 output voltages. The duty cycle of OUTP is less than 50% and OUTN is greater than 50% for negative output voltages. The voltage across the load is 0 V throughout most of the switching period, greatly reducing the switching current, which reduces any I 2R losses in the load. (See Figure 15). 11 |
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