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參數(shù)資料
| 型號(hào)： | TPA302DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大?。?/td> | 623K |
| 代理商： | TPA302DG4 |
www.ti.com
f
c(lowpass) +
1
2p R
F CF
(3)
Input Capacitor, CI
f
c(highpass) +
1
2p R
I
C
I
(4)
C
I +
1
2p R
I
f
c(highpass)
(5)
Power Supply Decoupling, CS
Midrail Bypass Capacitor, CB
1
C
B
25 k
v
1
C
I RI
(6)
TPA302
SLOS174C – JANUARY 1997 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
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. In effect, this creates a
low-pass filter network with the cutoff frequency defined in Equation 3.
For example, if RF is 100 k and CF is 5 pF, then fc(lowpass) is 318 kHz, which is well outside of the audio range.
In the typical application, 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.
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 10 k and the specification calls for a flat bass response down to 40 Hz.
Equation 4 is reconfigured as Equation 5.
In this example, CI is 0.4 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
than the source dc level. Note that it is important to confirm the capacitor polarity in the application.
The TPA302 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.
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 low it cannot 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 25-k
source inside the amplifier. To keep the start-up pop as low as
possible, the relationship shown in Equation 6 should be maintained.
As an example, consider a circuit where CB is 0.1 F, CI is 0.22 F and RI is 10 k. Inserting these values into
Equation 6 results in: 400
≤ 454 which satisfies the rule. Recommended values for bypass capacitor C
B are
0.1-F to 1-F, ceramic or tantalum low-ESR, for the best THD and noise performance.
17
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| TPA302DR | 功能描述:音頻放大器 0.3-W Stereo Audio Power Amplifier 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 |
| TPA302DRG4 | 功能描述:音頻放大器 0.3-W Stereo Audio Power Amplifier 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 |
| TPA302EVM | 功能描述:0.3-W STEREO AUDIO AMP EVAL MODU RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 音頻放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| TPA3100D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3100D2_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
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