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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： | 17/32頁 |
| 文件大小： | 698K |
| 代理商： | TPA6030A4PWPRG4 |
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TPA6030A4
SLOS395B DECEMBER 2002 REVISED JANUARY 2005
www.ti.com
24
Figures 28 through 31 demonstrate how the maximum ambient temperature changes with respect to VCC, RL, and the
derating factor.
Table 4. Efficiency and Maximum Ambient Temperature vs Output Power in
12-V Stereo 16- BTL Systems(1)
OUTPUT POWER
(PER CHANNEL)
(W)
EFFICIENCY
(%)
INTERNAL
DISSIPATION
(W)
POWER FROM
SUPPLY
(W)
MAX AMBIENT
TEMPERATURE
(°C)
0.25
17.1
2.4
2.92
82
0.50
24.8
3.0
4.04
65
1
35.6
3.6
5.62
49
2
50.9
3.9
7.88
42
3
62.7
3.6
9.57
50
(1) ICC(q) = 18 mA as shown in the electrical characteristics table.
Table 5. Efficiency and Maximum Ambient Temperature vs Output Power in
12-V Stereo 8- SE Systems(2)
OUTPUT POWER
(PER CHANNEL)
(W)
EFFICIENCY
(%)
INTERNAL
DISSIPATION
(W)
POWER FROM
SUPPLY
(W)
MAX AMBIENT
TEMPERATURE
(°C)
0.05
10.1
0.89
0.99
125
0.1
14.9
1.14
1.34
118
0.25
24.5
1.54
2.04
107
0.5
35.3
1.13
2.83
99
0.75
43.6
1.94
3.44
96
1
50.6
1.95
3.95
95
(2) ICC(q) = 11 mA as shown in the electrical characteristics table.
Tables 4 and 5 employ equations 14 and 18 respectively to calculate efficiencies for different output power levels.
Calculating the efficiency for a specific system is the key to proper power supply design. For a stereo 3-W audio system
with 16- loads and a 12-V supply, the maximum draw on the power supply is almost 9.6 W.
A final point to remember about Class-AB amplifiers is how to manipulate the terms in the efficiency equations to the best
advantage when possible. Note that in equations 14 and 18, VCC is in the denominator. This indicates that as VCC goes
down, efficiency goes up. Additionally, RL appears in both the numerator and denominator. Since the more dominant term
is in the numerator, as RL goes up, the efficiency goes up.
A simple formula for calculating the power dissipated, PDISS, is as follows:
PDISS = (1η)PSUP
The maximum ambient temperature, TA, depends on the heat sinking ability of the PCB system. The derating factor for a
28-pin PWP is shown in the dissipation rating table.
Converting this to θJA:
ΘJA +
1
Derating Factor +
1
0.0358 +
27.93°C W
Given ΘJA, the maximum allowable junction temperature, and the maximum internal dissipation, the maximum ambient
temperature can be calculated using equation 21. The maximum recommended junction temperature for the TPA6030A4
is 150°C.
TA Max + TJ Max * ΘJA PDiss
The maximum ambient temperature for the TPA6030A4 operating with a 12-V supply, and driving 3 W into 16- loads
(stereo operation) is:
TA Max + 150 * 27.93 (3.6) + 50.2°C
(19)
(20)
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| 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 |
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| 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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