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參數資料
| 型號： | TPA152D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.075 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOIC-8 |
| 文件頁數： | 4/18頁 |
| 文件大小： | 430K |
| 代理商： | TPA152D |
TPA152
75-mW STEREO AUDIO POWER AMPLIFIER
SLOS210A – JUNE 1998 – REVISED MARCH 2000
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting resistors, RF and RI
The gain for the TPA152 is set by resistors RF and RI according to equation 1.
(1)
Gain
+*
R
F
R
I
Given that the TPA152 is a MOS amplifier, the input impedance is very high, consequently input leakage
currents are not generally a concern although noise in the circuit increases as the value of RF increases. In
addition, a certain range of RF values are required for proper start-up operation of the amplifier. Taken together
it is recommended that the effective impedance seen by the inverting node of the amplifier be set between 5
k
and 20 k. The effective impedance is calculated in equation 2.
(2)
Effective Impedance
+
R
FRI
R
F ) RI
As an example, consider an input resistance of 20 k
and a feedback resistor of 20 k. The gain of the amplifier
would be – 1 and the effective impedance at the inverting terminal would be 10 k
, which is within the
recommended range.
For high performance applications, metal film resistors are recommended because they tend to have lower
noise levels than carbon resistors. For values of RF above 50 k, the amplifier tends to become unstable due
to a pole formed from RF and the inherent input capacitance of the MOS input structure. For this reason, a small
compensation capacitor of approximately 5 pF should be placed in parallel with RF. This, in effect, creates a
low-pass filter network with the cutoff frequency defined in equation 3.
(3)
f
c(lowpass) +
1
2
pR
F CF
For example if RF is 100 k and CF is 5 pF then fco(lowpass) is 318 kHz, which is well outside the audio range.
input capacitor, CI
In the typical application, an input capacitor, CI, is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and RI form a high-pass filter with the corner frequency
determined in equation 4.
(4)
f
c(highpass) +
1
2
pR
I
C
I
The value of CI is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where RI is 20 k and the specification calls for a flat bass response down to 20 Hz.
Equation 4 is reconfigured as equation 5.
(5)
C
I +
1
2
pR
I
f
c(highpass)
In this example, CI is 0.40 F, so one would likely choose a value in the range of 0.47 F to 1 F. A further
consideration for this capacitor is the leakage path from the input source through the input network (RI, CI) and
the feedback resistor (RF) to the load. This leakage current creates a dc offset voltage at the input to the amplifier
that reduces useful headroom, especially in high-gain applications (> 10). For this reason a low-leakage
tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the
capacitor should face the amplifier input in most applications, as the dc level there is held at VDD/2, which is
likely higher that the source dc level. Please note that it is important to confirm the capacitor polarity in the
application.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA152DG4 | 功能描述:音頻放大器 Hi-Fi Stereo Headphone 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 |
| TPA152DR | 功能描述:音頻放大器 Hi-Fi Stereo Headphone 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 |
| TPA152DRG4 | 功能描述:音頻放大器 Hi-Fi Stereo Headphone 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 |
| TPA152EVM | 功能描述:音頻 IC 開發工具 TPA152 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA180 | 功能描述:TVS 二極管 - 瞬態電壓抑制器 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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