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參數(shù)資料
| 型號： | TPA0312PWPR |
| 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)： | 20/36頁 |
| 文件大?。?/td> | 791K |
| 代理商： | TPA0312PWPR |
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www.ti.com
SE/BTL OPERATION
ROUT+
21
R
MUX
RHPIN
RLINEIN
+
23
20
8
RIN
ROUT
16
+
1 k
COUTR
330
F
100 k
SE/BTL
15
100 k
VDD
Volume
Control
Volume
Control
TPA0312
SLOS335A – DECEMBER 2000 – REVISED OCTOBER 2004
Table 4 and Table 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. Table 4 and Table 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 TPA0312 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 TPA0312, 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 TPA0312 is in the BTL mode. When SE/BTL is held high, the OUT- amplifiers are
in a high-output impedance state, which configures the TPA0312 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 42.
Figure 42. TPA0312 Resistor Divider Network Circuit
Using a readily available 1/8-in. (3,5-mm) stereo headphone jack, the control switch is closed when no plug is
inserted. When closed, the 100-k
/1-k divider pulls the SE/BTL input low. When a plug is inserted, the 1-k
resistor is disconnected and the SE/BTL input is pulled high. When the input goes high, the OUT- amplifier is
shut down causing the speaker to mute (virtually open-circuits the speaker). The OUT+ amplifier then drives
through the output capacitor (CO) into the headphone jack.
27
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0312PWPRG4 | 功能描述:音頻放大器 St 2W Aud Pwr Amp 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 |
| 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(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 |
| TPA032D01DCA | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-D AUDIO |
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