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參數(shù)資料
| 型號(hào)： | TPA6017A2PWPR |
| 元件分類： | 音頻放大器 |
| 英文描述： | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|20PIN|PLASTIC |
| 中文描述： | 音頻放大器|雙|的CMOS | TSSOP封裝| 20針|塑料 |
| 文件頁(yè)數(shù)： | 30/33頁(yè) |
| 文件大?。?/td> | 469K |
| 代理商： | TPA6017A2PWPR |
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TPA6011A4
SLOS392
–
FEBRUARY 2002
30
www.ti.com
APPLICATION INFORMATION
crest factor and thermal considerations (continued)
To convert dB back into watts use equation 10.
P
W
10
PdB 10
P
ref
(10)
= 250 mW (12-db crest factor)
= 500 mW (9-db crest factor)
= 1000 mW (6-db crest factor)
= 2000 mW (3-db crest factor)
= 125 mW (15-db crest factor)
= 63 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 worst case, which is 2 W of continuous power output with a 3-dB crest factor,
against 12-dB and 15-dB applications significantly affects maximum ambient temperature ratings for the
system. Using the power dissipation curves for a 5-V, 3-
system, the internal dissipation in the TPA6011A4
and maximum ambient temperatures is shown in Table 6.
Table 6. TPA6011A4 Power Rating, 5-V, 3-
Stereo
PEAK OUTPUT POWER
(W)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
4
2 W (3 dB)
1.7
–
3
°
C
6
°
C
24
°
C
51
°
C
78
°
C
96
°
C
4
1 W (6 dB)
1.6
4
500 mW (9 dB)
1.4
4
250 mW (12 dB)
1.1
4
125 mW (15 dB)
0.8
4
63 mW (18 dB)
0.6
Table 7. TPA6011A4 Power Rating, 5-V, 8-
Stereo
PEAK OUTPUT POWER (W)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
2.5
1250 mW (3-dB crest factor)
0.55
100
°
C
94
°
C
97
°
C
102
°
C
2.5
1000 mW (4-dB crest factor)
0.62
2.5
500 mW (7-dB crest factor)
0.59
2.5
250 mW (10-dB crest factor)
0.53
The maximum dissipated power (P
D(max)
) is reached at a much lower output power level for an 8-
load than
for a 3-
load. As a result, this simple formula for calculating P
D(max)
may be used for an 8-
application.
2V
2
DD
2
R
L
P
D(max)
(11)
However, in the case of a 3-
load, the P
D(max)
occurs at a point well above the normal operating power level.
The amplifier may therefore be operated at a higher ambient temperature than required by the P
D(max)
formula
for a 3-
load.
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