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參數(shù)資料
| 型號(hào)： | TPA0112PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 20/34頁 |
| 文件大?。?/td> | 655K |
| 代理商： | TPA0112PWP |
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P
D(max) +
2V2
DD
p 2
R
L
(11)
Θ
JA +
1
Derating Factor
+
1
0.022
+ 45
°C W
(12)
T
A Max + TJ Max * ΘJA PD
+ 150 * 45(0.6
2) + 96°C (15dB crest factor)
(13)
SE/BTL OPERATION
TPA0112
SLOS204C – MAY 1999 – REVISED SEPTEMBER 2004
Table 5. TPA0112 POWER RATING, 5-V, 8-
, STEREO
POWER DISSIPATION
MAXIMUM AMBIENT
PEAK OUTPUT POWER
AVERAGE OUTPUT POWER
(W/Channel)
TEMPERATURE(1)
2.5 W
1250 mW (3-dB crest factor)
0.55
85
°C
2.5 W
1000 mW (4-dB crest factor)
0.62
85
°C
2.5 W
500 mW (7-dB crest factor)
0.59
85
°C
2.5 W
250 mW (10-dB crest factor)
0.53
85
°C
(1)
Package limited to85
°C ambient.
The maximum dissipated power, PDmax, is reached at a much lower output power level for a 3- load than for an
8-
load. As a result, this simple formula for calculating P
D(max) may be used for a 3- application:
However, in the case of an 8-
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 PD(max) formula for
an 8-
load, but do not exceed the maximum ambient temperature of 85°C.
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:
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 TPA0112 is
150
°C. The internal dissipation figures are taken from the Power Dissipation vs Output Power graphs.
A.
Internal dissipation of 0.6 W is estimated for a 2-W system with 15-dB crest factor per channel. Due to process
limitations, the actual TA Max is 85°C.
Tables 4 and 5 show that for some applications no airflow is required to keep junction temperatures in the
specified range. The TPA0112 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.
The ability of the TPA0112 to easily switch between BTL and SE modes is one of its most important cost-saving
features. This feature eliminates the requirement for an additional headphone amplifier in applications where
internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated.
Internal to the TPA0112, two separate amplifiers drive OUT+ and OUT–. The SE/BTL input (terminal 15) controls
the operation of the follower amplifier that drives LOUT– and ROUT– (terminals 9 and 16). When SE/BTL is held
low, the amplifier is on and the TPA0112 is in the BTL mode. When SE/BTL is held high, the OUT– amplifiers
are in a high output impedance state, which configures the TPA0112 as an SE driver from LOUT+ and ROUT+
(terminals 4 and 21). IDD is reduced by approximately one-half in SE mode. Control of the SE/BTL input can be
from a logic-level CMOS source or, more typically, from a resistor divider network as shown in Figure 47.
27
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| TPA0112PWPG4 | 功能描述:音頻放大器 2W Stereo A 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 |
| TPA0112PWPR | 功能描述:音頻放大器 St 2W APA With Int Gain Settings 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 |
| TPA0112PWPRG4 | 功能描述:音頻放大器 St 2W APA With Int Gain Settings 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 |
| TPA0122 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS |
| TPA0122EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0122 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
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