- 您現在的位置：買賣IC網 > PDF目錄98274 > TPA4861DR (TEXAS INSTRUMENTS INC) 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 PDF資料下載
參數資料
| 型號： | TPA4861DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 6/26頁 |
| 文件大小： | 623K |
| 代理商： | TPA4861DR |
www.ti.com
RL
CC
VO(PP)
VDD
BTL AMPLIFIER EFFICIENCY
VL(RMS)
VO
IDD
IDD(RMS)
TPA4861
SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Figure 35. Single-Ended Configuration
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 times the output power of the SE
configuration. Internal dissipation versus output power is discussed further in the thermal considerations section.
Linear amplifiers are notoriously inefficient. The primary cause of these inefficiencies is voltage drop across the
output stage transistors. The internal voltage drop has two components. One is the headroom or dc voltage drop
that varies inversely to output power. The second component is due to the sine-wave nature of the output. The
total voltage drop can be calculated by subtracting the RMS value of the output voltage from VDD. The internal
voltage drop multiplied by the RMS value of the supply current, IDD(RMS), determines the internal power
dissipation of the amplifier.
An easy-to-use equation to calculate efficiency starts out as 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 36).
Figure 36. Voltage and Current Waveforms for BTL Amplifiers
Although the voltages and currents for SE and BTL are sinusoidal in the load, currents from the supply are
different between SE and BTL configurations. In an SE application, the current waveform is a half-wave rectified
shape, whereas in BTL it is a full-wave rectified waveform. This means RMS conversion factors are different.
Keep in mind that for most of the waveform, both the push and pull transistor are not on at the same time, which
supports the fact that each amplifier in the BTL device only draws current from the supply for half the waveform.
The following equations are the basis for calculating amplifier efficiency.
14
相關PDF資料 |
PDF描述 |
|---|---|
| TPA4861D | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861DG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861DRG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861Y | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC8 |
| TPA5050RSARG4 | SPECIALTY CONSUMER CIRCUIT, PQCC16 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA4861DRG4 | 功能描述:音頻放大器 1-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA-5 | 功能描述:保險絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產品: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 安裝風格: 端接類型:SMD/SMT 系列:485 |
| TPA-5,0-ADV | 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 18 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact;RoHS Compliant: NA |
| TPA-5,0-BAS | 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 4 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact ;RoHS Compliant: NA |
| TPA-5,0-L-BAS | 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0-L 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0-L; Kit Contents:Probe Kit, 4 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact ;RoHS Compliant: NA |
發布緊急采購，3分鐘左右您將得到回復。