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| 型号： | TPA6205A1DRBRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-8 |
| 文件页数： | 5/28页 |
| 文件大小： | 912K |
| 代理商： | TPA6205A1DRBRG4 |
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V
(rms) +
V
O(PP)
2 2
Power +
V
(rms)
2
R
L
(8)
RL
CC
VO(PP)
VDD
–3 dB
fc
RL
2x VO(PP)
VO(PP)
–VO(PP)
VDD
FULLY DIFFERENTIAL AMPLIFIER
fc +
1
2pR
L
C
(9)
www.ti.com.............................................................................................................................................................. SLOS490B–JULY 2006–REVISED JUNE 2008
eliminates the need for the blocking capacitors.
Low-frequency performance is then limited only by
the input network and speaker response. Cost and
PCB space are also minimized by eliminating the
bulky coupling capacitor.
Figure 33. Single-Ended Output and Frequency
Figure 32. Differential Output Configuration
Response
In a typical wireless handset operating at 3.6 V,
Increasing power to the load does carry a penalty of
bridging raises the power into an 8-
speaker from a
increased internal power dissipation. The increased
singled-ended (SE, ground reference) limit of 200
dissipation is understandable considering that the
mW to 800 mW. In sound power that is a 6-dB
BTL configuration produces 4× the output power of
improvement—which is loudness that can be heard.
the SE configuration.
In addition to increased power there are frequency
response concerns. Consider the single-supply SE
configuration
shown
in
A
coupling
EFFICIENCY AND THERMAL INFORMATION
capacitor is required to block the dc offset voltage
from reaching the load. This capacitor can be quite
Class-AB amplifiers are inefficient. The primary cause
large (approximately 33
F to 1000 F) so it tends to
of these inefficiencies is voltage drop across the
be expensive, heavy, occupy valuable PCB area, and
output stage transistors. There are two components
have
the
additional
drawback
of
limiting
of the internal voltage drop. One is the headroom or
low-frequency performance of the system. This
dc voltage drop that varies inversely to output power.
frequency-limiting effect is due to the high pass filter
The second component is due to the sinewave nature
network created with the speaker impedance and the
of the output. The total voltage drop can be
coupling
capacitance
and
is
calculated
with
calculated by subtracting the RMS value of the output
voltage from VDD. The internal voltage drop multiplied
by the average value of the supply current, IDD(avg),
determines the internal power dissipation of the
amplifier.
For example, a 68-
F capacitor with an 8- speaker
would attenuate low frequencies below 293 Hz. The
BTL configuration cancels the dc offsets, which
Copyright 2006–2008, Texas Instruments Incorporated
13
Product Folder Link(s): TPA6205A1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA6205A1DRBT | 功能描述:音频放大器 1.25-W Mono Fully Diff Class-AB Aud 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 |
| TPA6205A1DRBTG4 | 功能描述:音频放大器 1.25W Mono Fully Diff ClassAB Aud 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 |
| TPA6205A1EVM | 功能描述:音频 IC 开发工具 HEADPHONE DRIVER RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA6205A1ZQVR | 功能描述:音频放大器 1.25W Mono Fully Diff ClassAB Aud 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 |
| TPA6205A1ZQVRG1 | 功能描述:音频放大器 1.25W Mon,Fully Diff Class-AB Audio 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 |
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