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參數(shù)資料
| 型號(hào)： | TPA032D04DCARG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48 |
| 封裝： | PLASTIC, HTSSOP-48 |
| 文件頁(yè)數(shù)： | 14/26頁(yè) |
| 文件大小： | 439K |
| 代理商： | TPA032D04DCARG4 |
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TPA032D04
10W STEREO CLASSD AUDIO POWER AMPLIFIER
SLOS203B DECEMBER 1999 REVISED JUNE 2000
22
TI.COM
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
APPLICATION INFORMATION
crest factor and thermal considerations (continued)
Table 3. TPA032D04 Power Rating, 12-V, 4-
, Stereo
PEAK OUTPUT POWER
AVERAGE OUTPUT POWER
POWER DISSIPATION
MAXIMUM AMBIENT
PEAK OUTPUT POWER
(W)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
20
10 W (3 dB)
2.84
23
°C
20
5 W (6 dB)
1.66
75
°C
20
2.5 W (9 dB)
1.12
100
°C
20
1.25 W (12 dB)
0.87
111
°C
20
630 mW (15 dB)
0.7
118
°C
20
315 mW (18 dB)
0.6
123
°C
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 in2 of copper area on
a multilayer PCB is 44.8 mW/
°C. Converting this to ΘJA:
Θ
JA +
1
Derating
+
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
ΘJA, 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 + TJ Max * ΘJA PD
+ 150 * 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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