參數(shù)資料
型號： TPA751GQS
廠商： Texas Instruments, Inc.
元件分類： 音頻放大器
英文描述： 700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS
中文描述： 700兆瓦的單聲道低壓音頻功率放大器，具有差分輸入
文件頁數(shù)： 19/23頁
文件大小： 362K
代理商： TPA751GQS
TPA751
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS336C
–
DECEMBER 2000
–
REVISED OCTOBER 2002
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
headroom and thermal considerations
Linear power amplifiers dissipate a significant amount of heat in the package under normal operating conditions.
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 TPA751 data sheet, one can see that when the TPA751
is operating from a 5-V supply into an 8-
speaker that 700 mW peaks are available. Converting watts to dB:
PdB
10Log
PW
Pref
10Log700 mW
1 W
–
1.5 dB
Subtracting the headroom restriction to obtain the average listening level without distortion yields:
–
1.5 dB
–
15 dB =
–
16.5 (15 dB headroom)
–
1.5 dB
–
12 dB =
–
13.5 (12 dB headroom)
–
1.5 dB
–
9 dB =
–
10.5 (9 dB headroom)
–
1.5 dB
–
6 dB =
–
7.5 (6 dB headroom)
–
1.5 dB
–
3 dB =
–
4.5 (3 dB headroom)
Converting dB back into watts:
P
W
10
PdB 10
x Pref
= 22 mW (15 dB headroom)
= 44 mW (12 dB headroom)
= 88 mW (9 dB headroom)
= 175 mW (6 dB headroom)
= 350 mW (3 dB headroom)
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 700 mW of continuous power output with 0 dB
of headroom, against 12 dB and 15 dB applications drastically affects maximum ambient temperature ratings
for the system. Using the power dissipation curves for a 5-V, 8-
system, the internal dissipation in the TPA751
and maximum ambient temperatures is shown in Table 1.
Table 1. TPA751 Power Rating, 5-V, 8-
, BTL
PEAK OUTPUT
POWER
(mW)
AVERAGE
OUTPUT POWER
POWER
DISSIPATION
(mW)
D PACKAGE
(SOIC)
DGN PACKAGE
(MSOP)
GQS PACKAGE
(MicroStar Junior
)
MAXIMUM AMBIENT
TEMPERATURE
MAXIMUM AMBIENT
TEMPERATURE
MAXIMUM AMBIENT
TEMPERATURE
700
700 mW
675
34
°
C
47
°
C
68
°
C
89
°
C
111
°
C
110
°
C
115
°
C
122
°
C
125
°
C
125
°
C
99
°
C
105
°
C
114
°
C
123
°
C
125
°
C
700
350 mW (3 dB)
595
700
176 mW (6 dB)
475
700
88 mW (9 dB)
350
700
44 mW (12 dB)
225
Table 1 shows that the TPA751 can be used to its full 700-mW rating without any heat sinking in still air up to
110
°
C, 34
°
C, and 99
°
C for the DGN package (MSOP), D package (SOIC), and GQS (MicroStar Junior
)
package, respectively.
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