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參數資料
| 型號： | TPA6030A4PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| 封裝： | GREEN, PLASTIC, TSSOP-28 |
| 文件頁數： | 15/32頁 |
| 文件大小： | 698K |
| 代理商： | TPA6030A4PWPRG4 |
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TPA6030A4
SLOS395B DECEMBER 2002 REVISED JANUARY 2005
www.ti.com
22
THERMAL INFORMATION
Class-AB amplifiers are inefficient. The primary cause of these inefficiencies is a 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 VCC. The internal voltage drop multiplied by the
average value of the supply current, ICCavg, 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 and average values of power in the load and in the amplifier,
the current and voltage waveform shapes must first be understood (see Figure 27).
V(LRMS)
VO
ICC
ICCavg
Figure 27. 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 very different
between SE and BTL configurations. In an SE application the current waveform is a half-wave rectified waveform, 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 transistors 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:
Efficiency of a BTL amplifier +
PL
PSUP
where:
PL +
VLRMS
2
RL
, and VLRMS +
VP
2
, therefore, PL +
VP
2
2RL
per channel
PSUP + VCCICCavg ) VCC ICC(q)
and ICCavg + 1p
p
0
VP
RL
sin(t) dt +*
VP
pRL
[cos(t)]
p
0 +
2VP
pRL
therefore,
PSUP +
2VCC VP
pRL
) VCC ICC(q)
PL = Power delivered to load (per channel)
PSUP = Power drawn from power supply
VLRMS = RMS voltage on BTL load
RL = Load resistance
VP = Peak voltage on BTL load
ICCavg = Average current drawn from the
power supply
VCC = Power supply voltage
ηBTL = Efficiency of a BTL amplifier
ηSE = Efficiency of a SE amplifier
where VP + 2PL RL
(10)
(11)
(12)
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相關代理商/技術參數 |
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| TPA6040A4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6040A4EVM | 功能描述:音頻 IC 開發工具 TPA6040A4 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA6040A4RHB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6040A4RHBR | 功能描述:音頻放大器 2W Stereo Aud Pwr 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 |
| TPA6040A4RHBRG4 | 功能描述:音頻放大器 2W St Aud Pwr Amp 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 |
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