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TPA032D04 Datasheet(PDF) 21 Page - Texas Instruments

Part No. TPA032D04
Description  10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPA032D04 Datasheet(HTML) 21 Page - Texas Instruments

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TPA032D04
10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS203B − DECEMBER 1999 − REVISED JUNE 2000
21
TI.COM
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 TPA032D04 data sheet, one can see that when the
TPA032D04 is operating from a 12-V supply into a 4-Ω speaker that 20-W peaks are available. Converting watts
to dB:
PdB + 10Log
PW
Pref
+ 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:
PW + 10
PdB 10
Pref
+ 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
TPA032D04 and maximum ambient temperatures are shown in Table 3.


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