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| 型號： | TPA321DGNR |
| 元件分類： | 音頻放大器 |
| 英文描述： | Single Audio Amplifier |
| 中文描述： | 單音頻放大器 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大小： | 424K |
| 代理商： | TPA321DGNR |
TPA321
350-mW MONO AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS312A – JUNE 2000 – REVISED JUNE 2000
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 TPA321 data sheet, one can see that when the TPA321
is operating from a 5-V supply into a 8-
speaker 350 mW peaks are available. Converting watts to dB:
PdB
10Log
PW
Pref
10Log350 mW
1 W
–4.6 dB
Subtracting the headroom restriction to obtain the average listening level without distortion yields:
–4.6 dB – 15 dB = –19.6 dB (15 dB headroom)
–4.6 dB – 12 dB = –16.6 dB (12 dB headroom)
–4.6 dB – 9 dB = –13.6 dB (9 dB headroom)
–4.6 dB – 6 dB = –10.6 dB (6 dB headroom)
–4.6 dB – 3 dB = –7.6 dB (3 dB headroom)
Converting dB back into watts:
P
W
10
PdB 10
x Pref
= 11 mW (15 dB headroom)
= 22 mW (12 dB headroom)
= 44 mW (9 dB headroom)
= 88 mW (6 dB headroom)
= 175 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 350 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 TPA321
and maximum ambient temperatures is shown in Table 2.
Table 2. TPA321 Power Rating, 5-V, 8-
, BTL
PEAK OUTPUT POWER
(mW)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(mW)
MAXIMUM AMBIENT
TEMPERATURE
0 CFM
46
°
C
64
°
C
85
°
C
98
°
C
115
°
C
119
°
C
350
350 mW
600
350
175 mW (3 dB)
500
350
88 mW (6 dB)
380
350
44 mW (9 dB)
300
350
22 mW (12 dB)
200
350
11 mW (15 dB)
180
Table 2 shows that the TPA321 can be used to its full 350-mW rating without any heat sinking in still air up to
46
°
C.
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| TPA321DGNRG4 | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA321DR | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA321DRG4 | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA321EVM | 功能描述:音頻 IC 開發(fā)工具 TPA321 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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