參數(shù)資料
型號(hào)： TPA032D04DCAR
廠商： Texas Instruments, Inc.
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Dual Audio Amplifier
中文描述： 雙音頻放大器
文件頁(yè)數(shù)： 21/24頁(yè)
文件大?。?/td> 350K
代理商： TPA032D04DCAR
TPA032D04
10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS203A – DECEMBER 1999 – REVISED MARCH 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
crest factor and thermal considerations (continued)
Table 3. TPA032D04 Power Rating, 12-V, 4-
, Stereo
PEAK OUTPUT POWER
(W)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
20
10 W (3 dB)
2.84
23
°
C
75
°
C
100
°
C
111
°
C
118
°
C
123
°
C
20
5 W (6 dB)
1.66
20
2.5 W (9 dB)
1.12
20
1.25 W (12 dB)
0.87
20
630 mW (15 dB)
0.7
20
315 mW (18 dB)
0.6
The maximum ambient temperature depends on the heatsinking ability of the PCB system. Using the 0 CFM
data from the dissipation rating table, the derating factor for the DCA package with 6.9 in
2
of copper area on
a multilayer PCB is 44.8 mW/
°
C. Converting this to
Θ
JA
:
1
Derating
Θ
JA
1
0.0448
22.3
°
C W
(19)
To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are
per channel so the dissipated heat needs to be doubled for two channel operation. Given
Θ
JA
, the maximum
allowable junction temperature, and the total internal dissipation, the maximum ambient temperature can be
calculated with the following equation. The maximum recommended junction temperature for the TPA032D04
is 150
°
C. The internal dissipation figures are taken from the Efficiency vs Output Power graphs.
T
A
Max
T
J
Max
150
Θ
JA
P
D
22.3(0.7
2)
118
°
C (15 dB crest factor)
150
22.3(2.84
2)
23
°
C (3dB crest factor)
(20)
NOTE:
Internal dissipation of 1.4 W is estimated for a 10-W system with a 15 dB crest factor per channel.
The TPA032D04 is designed with thermal protection that turns the device off when the junction temperature
surpasses 150
°
C to prevent damage to the IC. Table 3 was calculated for maximum listening volume without
distortion. When the output level is reduced the numbers in the table change significantly. Also, using 8-
speakers dramatically increases the thermal performance by increasing amplifier efficiency.
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