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參數資料
| 型號： | TPA6138A2PWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.04 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數： | 2/18頁 |
| 文件大小： | 436K |
| 代理商： | TPA6138A2PWR |
–IN
Differential Input
Inverting Input
TPA6138A2
R 1
R 2
R2
+
–
C 3
C3
R 3
R3
C1
C 1
C 2
R 1
R 2
+
–
C 3
R 3
C 1
C 2
+IN
–IN
TPA6138A2
cIN
IN
cIN
IN
1
f
=
C
=
2 R
C
2 f
R
or
p
R1
R2
R3
VSUP_MO
UVP
SLOS704A
– JANUARY 2011 – REVISED MAY 2011
Figure 8. Second-Order Active Low-Pass Filter
The resistor values should have a low value for obtaining low noise, but should also have a high enough value to
allow use of a small-size ac-coupling capacitor. With the proposed values of 15 k
Ω, 30 kΩ, and 43 kΩ, a dynamic
range (DYR) of 106 dB can be achieved with a 1-
μF input ac-coupling capacitor.
INPUT-BLOCKING CAPACITORS
DC input-blocking capacitors are required to be added in series with the audio signal into the input pins of the
TPA6138A2. These capacitors block the dc portion of the audio source and allow the TPA6138A2 inputs to be
properly biased to provide maximum performance.
These capacitors form a high-pass filter with the input resistor, RIN. The cutoff frequency is calculated using
Equation 3. For this calculation, the capacitance used is the input-blocking capacitor and the resistance is the
input resistor chosen from Table 1; then the frequency and/or capacitance can be determined when one of the
two values is given.
It is recommended to use electrolytic capacitors or high-voltage-rated capacitors as input blocking capacitors to
ensure minimal variation in capacitance with input voltages. Such variation in capacitance with input voltages is
commonly seen in ceramic capacitors and can increase low-frequency audio distortion.
(3)
TPA6138A2 UVP OPERATION
The shutdown threshold at the UVP pin is 1.25 V. The customer must use a resistor divider to obtain the
shutdown threshold and hysteresis desired for a particular application. The customer-selected thresholds can be
determined as follows:
VUVP = (1.25 – 6 A × R3) × (R1 + R2) / R2
Hysteresis = 5
A × R3 × (R1 + R2) / R2
For example, to obtain VUVP = 3.8 V and 1-V
hysteresis, we can use R1 = 3 k
Ω, R2 = 1 kΩ and R3
= 50 k
Ω.
10
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPA6138A2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6139A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DirectPatha?￠ 25-mW Headphone Amplifier With Programmable-Fixed Gain |
| TPA6139A2EVM | 功能描述:音頻 IC 開發工具 TPA6139A2EVM 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 |
| TPA6139A2PW | 功能描述:音頻放大器 25mW Headphone 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 |
| TPA6139A2PW | 制造商:Texas Instruments 功能描述:HEADPHONE AMPLFIER IC STEREO 32OHM 25 |
| TPA6139A2PWR | 功能描述:音頻放大器 25mW Headphone 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 |
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