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参数资料
| 型号： | TPA6045A4CRHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| 封装： | QFN-32 |
| 文件页数： | 16/30页 |
| 文件大小： | 1147K |
| 代理商： | TPA6045A4CRHBR |
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fc
IN +
1
2p R
IN CIN
C
IN +
1
2p fc
IN RIN
or
(7)
Charge Pump Flying Capacitor and CPVSS Capacitor
Decoupling Capacitors
Midrail Bypass Capacitor, CBYPASS
Low Dropout Regulator (LDO) Description
Layout Recommendations
www.ti.com.............................................................................................................................................................................................. SLOS614 – OCTOBER 2008
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 TPA6045A4C 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 TPA6045A4C 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 TPA6045A4C 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 TPA6045A4C is important for the performance of the
amplifier. Use a 10
F or greater capacitor near the TPA6045A4C to filter lower frequency noise signals;
however, the high PSRR of the TPA6045A4C 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 25 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 TPA6045A4C contains a 3.3-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 TPA6045A4C QFN package to a
pad on the PCB.
It is important to keep the TPA6045A4C 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 TPA6045A4C. The layout of the TPA6045A4C evaluation module (EVM)
is a good example of component placement and the layout files are available at www.ti.com.
Copyright 2008, Texas Instruments Incorporated
23
Product Folder Link(s): TPA6045A4C
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| TPA6047A4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPatTM STEREO HEADPHONE DRIVE AND REGULATOR |
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| TPA6047A4RHBRG4 | 功能描述:音频放大器 2W Stereo Audio Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6100A2 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:50-mW Ultra-Low Voltage Audio Power Amp |
| TPA6100A2D | 功能描述:音频放大器 Ultra Low Voltage Stereo Headphone RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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