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參數資料
| 型號： | TPA6040A4RHBT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| 封裝： | GREEN, PLASTIC, QFN-32 |
| 文件頁數： | 14/28頁 |
| 文件大小： | 685K |
| 代理商： | TPA6040A4RHBT |
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Charge Pump Flying Capacitor and CPVSS Capacitor
Decoupling Capacitors
Midrail Bypass Capacitor, C
BYPASS
LOW DROPOUT REGULATOR (LDO) DESCRIPTION
LAYOUT RECOMMENDATIONS
SLOS519A – APRIL 2007 – REVISED APRIL 2007
If a high-pass filter with a -3-dB point of no more than 20 Hz is desired over all gain settings, the minimum
impedance would be used in the Equation 7. The minimum input impedance for TPA6040A4 is 20 k
. The
capacitor value by Equation 7 would be 0.399
F. However, this is C
IN,
and the desired value is for
C(DCINPUT-BLOCKING). Multiplying CIN by 2 yields 0.80 F, which is close to the standard capacitor value of 1 F.
Place 1-
F capacitors at each input terminal of the TPA6040A4 to complete the filter.
The charge pump flying capacitor serves to transfer charge during the generation of the negative supply voltage.
The CPVSS capacitor must be at least equal to the flying capacitor in order to allow maximum charge transfer.
Low ESR capacitors are an ideal selection, and a value of 1 F is typical.
The TPA6040A4 is a DirectPath headphone amplifier that requires adequate power supply decoupling to
ensure that the noise and total harmonic distortion (THD) are as low as possible. To filter high-frequency
transients, spikes, and digital hash on the power line, use good low equivalent-series-resistance (ESR) ceramic
capacitors, typically 1 F. Find the smallest package possible, and place as close as possible to the device VDD
lead. Placing the decoupling capacitors close to the TPA6040A4 is important for the performance of the
amplifier. Use a 10
F or greater capacitor near the TPA6040A4 to filter lower frequency noise signals; however,
the high PSRR of the TPA6040A4 makes the 10-
F capacitor unnecessary in most applications.
The midrail bypass capacitor, C(BYPASS), has several important functions. During start-up or recovery from
shutdown mode, CBYPASS determines the rate at which the amplifier starts up. A 1-F capacitor yields a start-up
time of approximately 30 ms. CBYPASS also reduces the noise coupled into the output signal by the power supply.
This improves the power supply ripple rejection (PSRR) of the amplifier. Ceramic or polyester capacitors with
low ESR and values in the range of 0.47
F to 1 F are recommended.
The TPA6040A4 contains a 4.75-V output low dropout regulator (LDO) capable of providing a maximum of 120
mA with a drop of less than 150 mV from the 5-V supply. This can be used to power an external CODEC. A
10-
F decoupling capacitor is recommended at the output of the LDO as well as 0.1-F capacitor to filter
high-frequency noise from the supply line.
Solder the exposed thermal pad (metal pad on the bottom of the part) on the TPA6040A4 QFN package to a
pad on the PCB.
It is important to keep the TPA6040A4 external components close to the body of the amplifier to limit noise
pickup. One should lay out the differential input leads symmetrical and close together to take advantage of the
inherent common mode rejection of the TPA6040A4. The layout of the TPA6040A4 evaluation module (EVM) is
a good example of component placement and the layout files are available at ti.com.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6041A4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath? STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6041A4RHBR | 功能描述:音頻放大器 2W St Aud Pwr 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 |
| TPA6041A4RHBRG4 | 功能描述:音頻放大器 2W St Aud Pwr 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 |
| TPA6043A4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath? STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6043A4RHB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath⑩ STEREO HEADPHONE DRIVE AND REGULATOR |
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