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TPA032D01 Datasheet(PDF) 19 Page - Texas Instruments |
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TPA032D01 Datasheet(HTML) 19 Page - Texas Instruments |
19 / 25 page TPA032D01 10W MONO CLASSD AUDIO POWER AMPLIFIER SLOS282B − DECEMBER 1999 − REVISED JUNE 2000 19 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION crest factor and thermal considerations A typical music CD requires 12 dB to 15 dB of dynamic headroom to pass the loudest portions without distortion as compared with the average power output. From the TPA032D01 data sheet, one can see that when the TPA032D01 is operating from a 12-V supply into a 4- Ω speaker that 20-W peaks are available. Converting watts to dB: P dB + 10 Log P W P ref + 10Log 20 1 + 6dB (17) Subtracting the crest factor restriction to obtain the average listening level without distortion yields: 6.0 dB * 15 dB +* 9dB (15 dB crest factor) 6.0 dB * 12 dB +* 6dB (12 dB crest factor) 6.0 dB * 9dB +* 3dB (9dBcrest factor) 6.0 dB * 6dB +* 0dB (6dBcrest factor) 6.0 dB * 3dB + 3dB (3 dB crest factor) 6.0 dB * 18 dB +* 12 dB (15 dB crest factor) Converting dB back into watts: P W + 10 PdB 10 P ref + 630 mW (15 dB crest factor) + 1.25 W (12 dB crest factor) + 2.5 W (9 dB crest factor) + 5 W (6 dB crest factor) + 10 W (3 dB crest factor) (18) + 315 mW (18 dB crest factor) This is valuable information to consider when attempting to estimate the heat dissipation requirements for the amplifier system. Comparing the absolute worst case, which is 10 W of continuous power output with a 3 dB crest factor, against 12 dB and 15 dB applications drastically affects maximum ambient temperature ratings for the system. Using the power dissipation curves for a 12-V, 4- Ω system, the internal dissipation in the TPA032D01 and maximum ambient temperatures are shown in Table 3. |
Número de pieza similar - TPA032D01_07 |
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Descripción similar - TPA032D01_07 |
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