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參數(shù)資料
| 型號： | TPA751GQS |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | 700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS |
| 中文描述： | 700兆瓦的單聲道低壓音頻功率放大器，具有差分輸入 |
| 文件頁數(shù)： | 12/23頁 |
| 文件大?。?/td> | 362K |
| 代理商： | TPA751GQS |
TPA751
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS336C
–
DECEMBER 2000
–
REVISED OCTOBER 2002
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
bridged-tied load
Figure 23 shows a linear audio power amplifier (APA) in a BTL configuration. The TPA751 BTL amplifier consists
of two linear amplifiers driving both ends of the load. There are several potential benefits to this differential drive
configuration, but initially consider power to the load. The differential drive to the speaker means that as one
side is slewing up, the other side is slewing down, and vice versa. This, in effect, doubles the voltage swing on
the load as compared to a ground referenced load. Plugging 2
×
V
O(PP)
into the power equation, where voltage
is squared, yields 4
×
the output power from the same supply rail and load impedance (see equation 1).
Power
V
(rms)
R
L
2
(1)
V(rms)
VO(PP)
2 2
RL
2x VO(PP)
VO(PP)
–
VO(PP)
VDD
VDD
Figure 23. Bridge-Tied Load Configuration
In a typical portable handheld equipment sound channel operating at 3.3 V, bridging raises the power into an
8-
speaker from a singled-ended (SE, ground reference) limit of 62.5 mW to 250 mW. In sound power that is
a 6-dB improvement, which is loudness that can be heard. In addition to increased power, there are frequency
response concerns. Consider the single-supply SE configuration shown in Figure 24. A coupling capacitor is
required to block the dc offset voltage from reaching the load. These capacitors can be quite large
(approximately 33
μ
F to 1000
μ
F), so they tend to be expensive, heavy, occupy valuable PCB area, and have
the additional drawback of limiting low-frequency performance of the system. This frequency-limiting effect, due
to the high pass filter network created with the speaker impedance and the coupling capacitance, is calculated
with equation 2.
fc
1
2 RLCC
(2)
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| TPA751GQSR | 功能描述:音頻放大器 Mono Diff Input Class-AB 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 |
| TPA77930DGK | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TPA-B-20 | 功能描述:保險絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險絲類型:Fast Acting 保險絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類型:SMD/SMT 系列:485 |
| TPA-B-25 | 功能描述:保險絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險絲類型:Fast Acting 保險絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類型:SMD/SMT 系列:485 |
| TPA-B-30 | 功能描述:保險絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險絲類型:Fast Acting 保險絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類型:SMD/SMT 系列:485 |
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