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參數(shù)資料
| 型號： | TPA0233DGQRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 711K |
| 代理商： | TPA0233DGQRG4 |
TPA0233
2W MONO AUDIO POWER AMPLIFIER
WITH HEADPHONE DRIVE
SLOS278D JANUARY 2000 REVISED NOVEMBER 2002
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
(10)
PL = Power devilered to load
PSUP = Power drawn from power supply
VLRMS = RMS voltage on BTL load
RL = Load resistance
h
BTL +
p 2P
L RL
4V
DD
therefore,
VP = Peak voltage on BTL load
IDDavg = Average current drawn from the power supply
VDD = Power supply voltage
ηBTL = Efficiency of a BTL amplifier
Table 2 employs equation 10 to calculate efficiencies for four different output power levels. Note that the
efficiency of the amplifier is quite low for lower power levels and rises sharply as power to the load is increased,
resulting in a nearly flat internal power dissipation over the normal operating range. Note that the internal
dissipation at full output power is less than in the half power range. Calculating the efficiency for a specific
system is the key to proper power supply design. For a stereo 1-W audio system with 8-
loads and a 5-V supply,
the maximum draw on the power supply is almost 3.25 W.
Table 2. Efficiency vs Output Power in 5-V, 8-
BTL Systems
Output Power
(W)
Efficiency
(%)
Peak Voltage
(V)
Internal Dissipation
(W)
0.25
31.4
2.00
0.55
0.50
44.4
2.83
0.62
1.00
62.8
4.00
0.59
1.25
70.2
4.47
0.53
High peak voltages cause the THD to increase.
A final point to remember about Class-AB amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. Note that in equation 10, VDD is in the denominator.
This indicates that as VDD goes down, efficiency goes up.
crest factor and thermal considerations
Class-AB power amplifiers dissipate a significant amount of heat in the package under normal operating
conditions. A typical music CD requires 12 dB to 15 dB of dynamic range, or headroom above the average power
output, to pass the loudest portions of the signal without distortion. In other words, music typically has a crest
factor between 12 dB and 15 dB. When determining the optimal ambient operating temperature, the internal
dissipated power at the average output power level must be used. The TPA0233 data sheet shows that when
the TPA0233 is operating from a 5-V supply into a 4-
speaker, 4-W peaks are available. Converting watts to
dB:
P
dB +
10 Log
P
W
P
ref
+ 10Log 4W
1W
+ 6dB
(11)
Subtracting the headroom restriction to obtain the average listening level without distortion yields
6 dB 15 dB = 9 dB (15-dB crest factor)
6 dB 12 dB = 6 dB (12-dB crest factor)
6 dB 9 dB = 3 dB (9-dB crest factor)
6 dB 6 dB = 0 dB (6-dB crest factor)
6 dB 3 dB = 3 dB (3-dB crest factor)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0233EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0233 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
| TPA0233G | 制造商:ON Semiconductor 功能描述:THY T0220 SPECIAL SCR |
| TPA0234G | 功能描述:SCR THY C77 SPECIAL SCR RoHS:否 制造商:STMicroelectronics 最大轉折電流 IBO:480 A 額定重復關閉狀態(tài)電壓 VDRM:600 V 關閉狀態(tài)漏泄電流（在 VDRM IDRM 下）:5 uA 開啟狀態(tài) RMS 電流 (It RMS): 正向電壓下降:1.6 V 柵觸發(fā)電壓 (Vgt):1.3 V 最大柵極峰值反向電壓:5 V 柵觸發(fā)電流 (Igt):35 mA 保持電流（Ih 最大值）:75 mA 安裝風格:Through Hole 封裝 / 箱體:TO-220 封裝:Tube |
| TPA0242 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL |
| TPA0242EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0242 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
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