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參數(shù)資料
| 型號(hào)： | TPA152DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | 0.075 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOIC-8 |
| 文件頁(yè)數(shù)： | 5/18頁(yè) |
| 文件大小： | 430K |
| 代理商： | TPA152DR |
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TPA152
75-mW STEREO AUDIO POWER AMPLIFIER
SLOS210A – JUNE 1998 – REVISED MARCH 2000
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power supply decoupling, CS
The TPA152 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to
ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also
prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that target different types of noise on the power supply leads.
For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance
(ESR) ceramic capacitor, typically 0.1
F, placed as close as possible to the device VDD lead, works best. For
filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10
F or greater placed near
the power amplifier is recommended.
midrail bypass capacitor, CB
The midrail bypass capacitor, CB, serves several important functions. During startup or recovery from shutdown
mode, CB determines the rate at which the amplifier starts up. This helps to push the start-up pop noise into
the subaudible range (so slow it can not be heard). The second function is to reduce noise produced by the
power supply caused by coupling into the output drive signal. This noise is from the midrail generation circuit
internal to the amplifier. The capacitor is fed from a 160-k
source inside the amplifier. To keep the start-up pop
as low as possible, the relationship shown in equation 6 should be maintained.
(6)
1
C
B
160 k
v
1
C
I RI
As an example, consider a circuit where CB is 1 F, CI is 1 F and RI is 20 k. Inserting these values into the
equation 9 results in:
6.25
v 50
which satisfies the rule. Bypass capacitor, CB, values of 0.1 F to 1 F ceramic or tantalum low-ESR capacitors
are recommended for the best THD and noise performance.
output coupling capacitor, CC
In the typical single-supply single-ended (SE) configuration, an output coupling capacitor (CC) is required to
block the dc bias at the output of the amplifier thus preventing dc currents in the load. As with the input coupling
capacitor, the output coupling capacitor and impedance of the load form a high-pass filter governed by
equation 7.
(7)
f
c(high) +
1
2
pR
L
C
The main disadvantage, from a performance standpoint, is that the load impedances are typically small, which
drive the low-frequency corner higher. Large values of CC are required to pass low frequencies into the load.
Consider the example where a CC of 68 F is chosen and loads vary from 32 to 47 k. Table 1 summarizes
the frequency response characteristics of each configuration.
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| TPA152DRG4 | 功能描述:音頻放大器 Hi-Fi Stereo Headphone RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
| TPA152EVM | 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA152 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA180 | 功能描述:TVS 二極管 - 瞬態(tài)電壓抑制器 180V 50uA Bidirect RoHS:否 制造商:Vishay Semiconductors 極性:Bidirectional 工作電壓: 擊穿電壓:58.9 V 鉗位電壓:77.4 V 峰值浪涌電流:38.8 A 系列: 封裝 / 箱體:DO-214AB 最小工作溫度:- 55 C 最大工作溫度:+ 150 C |
| TPA180A18 | 功能描述:硅對(duì)稱(chēng)二端開(kāi)關(guān)元件 USE 511-TPA180 F-126 180V TRISIL RoHS:否 制造商:Bourns 轉(zhuǎn)折電流 VBO:40 V 最大轉(zhuǎn)折電流 IBO:800 mA 不重復(fù)通態(tài)電流: 額定重復(fù)關(guān)閉狀態(tài)電壓 VDRM:25 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）: 保持電流（Ih 最大值）:50 mA 開(kāi)啟狀態(tài)電壓:5 V 關(guān)閉狀態(tài)電容 CO:120 pF 最大工作溫度:+ 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DO-214AA |
| TPA180RL | 功能描述:TVS 二極管 - 瞬態(tài)電壓抑制器 180V 50uA Bidirect RoHS:否 制造商:Vishay Semiconductors 極性:Bidirectional 工作電壓: 擊穿電壓:58.9 V 鉗位電壓:77.4 V 峰值浪涌電流:38.8 A 系列: 封裝 / 箱體:DO-214AB 最小工作溫度:- 55 C 最大工作溫度:+ 150 C |
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