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參數資料
| 型號： | TPA0312PWPR |
| 元件分類： | 音頻放大器 |
| 英文描述： | SWITCH, DPDT, R/A, PCB, ON-OFF-ON; Switch function type:On-Off-On; Material, contact:Copper Alloy; Temp, op. max:85(degree C); Temp, op. min:-30(degree C); Length / Height, external:9.14mm; Width, external:8.13mm; Depth, RoHS Compliant: Yes |
| 中文描述： | 音頻放大器|雙|的CMOS | TSSOP封裝| 24針|塑料 |
| 文件頁數： | 27/31頁 |
| 文件大小： | 445K |
| 代理商： | TPA0312PWPR |
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TPA0312
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
SLOS335 –DECEMBER 2000
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
crest factor and thermal considerations (continued)
Table 5. TPA0312 Power Rating, 5-V, 8-
, Stereo
PEAK OUTPUT POWER
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
2.5 W
1250 mW (3 dB crest factor)
0.55
100
°
C
94
°
C
97
°
C
102
°
C
2.5 W
1000 mW (4 dB crest factor)
0.62
2.5 W
500 mW (7 dB crest factor)
0.59
2.5 W
250 mW (10 dB crest factor)
0.53
The maximum dissipated power, P
Dmax
, 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
Dmax
may be used for an 8-
application:
2V
2
DD
2
R
L
P
Dmax
(11)
However, in the case of a 3-
load, the P
Dmax
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
Dmax
formula
for a 3-
load.
The maximum ambient temperature depends on the heat sinking ability of the PCB system. The derating factor
for the PWP package is shown in the dissipation rating table (see page 4). Converting this to
Θ
JA
:
1
Derating Factor
0.022
(12)
Θ
JA
1
45
°
C W
To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are
per channel so the dissipated power needs to be doubled for two channel operation. Given
Θ
JA
, 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 TPA0312 is
150
°
C. The internal dissipation figures are taken from the Power Dissipation vs Output Power graphs.
T
A
Max
T
J
Max
150
Θ
JA
P
D
45(0.6
2)
96
°
C (15 dB crest factor)
(13)
NOTE:
Internal dissipation of 0.6 W is estimated for a 2-W system with 15 dB crest factor per channel.
Tables 4 and 5 show that for some applications no airflow is required to keep junction temperatures in the
specified range. The TPA0312 is designed with thermal protection that turns the device off when the junction
temperature surpasses 150
°
C to prevent damage to the IC. Tables 4 and 5 were 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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| TPA0312PWPRG4 | 功能描述:音頻放大器 St 2W Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA032D01 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D01_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D01DCA | 功能描述:音頻放大器 10W Monaur RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA032D01DCA | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-D AUDIO |
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