參數(shù)資料
型號(hào): TPA032D03DCA
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 10 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO48
封裝: PLASTIC, HTSSOP-48
文件頁數(shù): 14/26頁
文件大?。?/td> 428K
代理商: TPA032D03DCA
TPA032D03
10W MONO CLASSD AUDIO POWER AMPLIFIER
SLOS283B DECEMBER 1999 REVISED JUNE 2000
21
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 TPA032D03 data sheet, one can see that when the
TPA032D03 is operating from a 12-V supply into a 4-
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-
system, the internal dissipation in the
TPA032D03 and maximum ambient temperatures are shown in Table 3.
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