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參數資料
| 型號： | TPA005D14DCAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48 |
| 封裝： | PLASTIC, HTSSOP-48 |
| 文件頁數： | 19/30頁 |
| 文件大小： | 492K |
| 代理商： | TPA005D14DCAR |
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TPA005D14
2-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS240A – AUGUST 1999 – REVISED MARCH 2000
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
crest factor and thermal considerations (continued)
Table 3. TPA005D14 Power Rating, 5-V, 4-
, Stereo
PEAK OUTPUT POWER
AVERAGE OUTPUT
POWER DISSIPATION
MAXIMUM AMBIENT
(W)
POWER
(W/Channel)
TEMPERATURE
4
2 W (3 dB)
0.56
125
°C
4
1000 mW (6 dB)
0.30
136
°C
4
500 mW (9 dB)
0.23
139
°C
4
250 mW (12 dB)
0.20
141
°C
4
120 mW (15 dB)
0.14
143
°C
4
63 mW (18 dB)
0.09
146
°C
Case temperature (TC) is rated to 125°C maximum.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
DERATING FACTOR
TA = 70°C
TA = 85°C
DCA
5.6 W
44.8 mW/
°C
3.5 W
2.9 W
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
(5)
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 TPA005D14
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(0.14
2)
+ 143°C (15 dB crest factor)
+ 150 * 22.3(0.56
2)
+ 125°C (3dB crest factor)
(6)
NOTE:
Internal dissipation of 0.6 W is estimated for a 2-W system with a 15 dB crest factor per channel.
Table 3 shows that for some applications no airflow is required to keep junction temperatures in the specified
range. The TPA005D14 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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