參數(shù)資料
型號(hào)： 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(yè)數(shù)： 13/23頁(yè)
文件大小： 362K
代理商： TPA751GQS
TPA751
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS336C
–
DECEMBER 2000
–
REVISED OCTOBER 2002
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
bridged-tied load (continued)
For example, a 68-
μ
F capacitor with an 8-
speaker would attenuate low frequencies below 293 Hz. The BTL
configuration cancels the dc offsets, which 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.
RL
CC
VO(PP)
VO(PP)
VDD
–
3 dB
fc
Figure 24. Single-Ended Configuration and Frequency Response
Increasing power to the load does carry a penalty of increased internal power dissipation. The increased
dissipation is understandable considering that the BTL configuration produces 4
×
the output power of a SE
configuration. Internal dissipation versus output power is discussed further in the
thermal considerations
section.
BTL amplifier efficiency
The primary cause of linear amplifier inefficiencies is voltage drop across the output stage transistors. There
are two components of the internal voltage drop. One is the headroom or dc voltage drop that varies inversely
to output power. The second component is due to the sinewave nature of the output. The total voltage drop, can
be calculated by subtracting the RMS value of the output voltage from V
DD
. The internal voltage drop multiplied
by the RMS value of the supply current, I
DD
rms, determines the internal power dissipation of the amplifier.
An easy-to-use equation to calculate efficiency starts out being equal to the ratio of power from the power supply
to the power delivered to the load. To accurately calculate the RMS values of power in the load and in the
amplifier, the current and voltage waveform shapes must first be understood (see Figure 25).
V(LRMS)
VO
IDD
IDD(RMS)
Figure 25. Voltage and Current Waveforms for BTL Amplifiers
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(xiǎn)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(xiǎn)絲類型:Fast Acting 保險(xiǎn)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(xiǎn)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(xiǎn)絲類型:Fast Acting 保險(xiǎn)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(xiǎn)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(xiǎn)絲類型:Fast Acting 保險(xiǎn)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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