- 您现在的位置：买卖IC网 > PDF目录98274 > TPA6041A4RHBR (TEXAS INSTRUMENTS INC) 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 PDF资料下载
参数资料
| 型号： | TPA6041A4RHBR |
| 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： | GREEN, PLASTIC, QFN-32 |
| 文件页数： | 14/30页 |
| 文件大小： | 1141K |
| 代理商： | TPA6041A4RHBR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
www.ti.com
Headphone Amplifier Description
fc +
1
2pR
LCO
(4)
C
O +
1
2pR
Lfc
(5)
SLOS542 – AUGUST 2007
Bridge-tying the outputs in a typical computer audio, LCD TV, or multimedia LCD monitor application drastically
increases output power. For example, if an amplifier in a single-ended configuration was capable of outputting a
maximum of 250 mW for a given load with a supply voltage of 12 V, then that same amplifier would be able to
output 1 W of power in a BTL configuration with the same supply voltage and load. In addition to the increase in
output power, the BTL configuration does not suffer from the same low-frequency issues that plague the
single-ended configuration. In a BTL configuration, there is no need for an output capacitor to block dc, so no
unwanted filtering occurs. In addition, the BTL configuration saves money and space, as the dc-blocking
capacitors needed for single-ended operation are large and expensive. For example, with an 8-
load in SE
operation, the user needs a 1000-
μF capacitor to obtain a cutoff frequency below 20 Hz. This capacitor is
expensive and large.
The headphone amplifier has a fixed gain of –1.5 V/V. It uses single-ended (SE) inputs. The DirectPath
amplifier architecture operates from a single supply but makes use of an internal charge pump to provide a
negative voltage rail. Combining the user-provided positive rail and the negative rail generated by the IC, the
device operates in what is effectively a split supply mode. The output voltages are now centered at zero volts
with the capability to swing to the positive rail or negative rail. The DirectPath amplifier requires no output dc
blocking capacitors and does not place any voltage on the sleeve. The block diagram and waveform of Figure 43
illustrate the ground-referenced headphone architecture. This is the architecture of the TPA6041A4.
Single-supply headphone amplifiers typically require dc-blocking capacitors. The capacitors are required because
most headphone amplifiers have a dc bias on the outputs pin. If the dc bias is not removed, the output signal is
severely clipped, and large amounts of dc current rush through the headphones, potentially damaging them. The
left-side drawing in Figure 43 illustrates the conventional headphone amplifier connection to the headphone jack
and output signal.
DC blocking capacitors are often large in value. The headphone speakers (typical resistive values of 16
or
32
) combine with the dc blocking capacitors to form a high-pass filter. Equation 4 shows the relationship
between the load impedance (RL), the capacitor (CO), and the cutoff frequency (fC).
If fc is low, the capacitor must then have a large value because the load resistance is small. Large capacitance
values require large package sizes. Large package sizes consume PCB area, stand high above the PCB,
increase cost of assembly, and can reduce the fidelity of the audio output signal.
Two different headphone amplifier applications are available that allow for the removal of the output dc blocking
capacitors. The capacitor-less amplifier architecture is implemented in the same manner as the conventional
amplifier with the exception of the headphone jack shield pin. This amplifier provides a reference voltage, which
is connected to the headphone jack shield pin. This is the voltage on which the audio output signals are
centered. This voltage reference is half of the amplifier power supply to allow symmetrical swing of the output
voltages. Do not connect the shield to any GND reference, or large currents will result. The scenario can happen
if, for example, an accessory other than a floating GND headphone is plugged into the headphone connector.
See the second block diagram and waveform in Figure 43.
Copyright 2007, Texas Instruments Incorporated
21
Product Folder Link(s): TPA6041A4
相关PDF资料 |
PDF描述 |
|---|---|
| TPA6043A4RHBRG4 | 2.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| TPA6043A4RHBR | 2.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| TPA6043A4RHB | 2.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| TPA6045A4CRHBR | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| TPA6045A4CRHB | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA6041A4RHBRG4 | 功能描述:音频放大器 2W St Aud 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 |
| TPA6043A4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath? STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6043A4RHB | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath⑩ STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6043A4RHBR | 功能描述:音频放大器 2-W Stereo Audio Power 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 |
| TPA6043A4RHBRG4 | 功能描述:音频放大器 2W St Aud 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 |
发布紧急采购，3分钟左右您将得到回复。