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參數資料
| 型號： | TPA6204A1DGN |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 4/20頁 |
| 文件大小： | 647K |
| 代理商： | TPA6204A1DGN |
TPA6204A1
SLOS429 MAY 2004
www.ti.com
12
Table 2 and Table 3 employ equation (5) 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 1-W audio system
with 8-
loads and a 5-V supply, the maximum draw on the
power supply is almost 1.6 W.
A final point to remember about Class-AB amplifiers is how
to manipulate the terms in the efficiency equation to the
utmost advantage when possible.
A simple formula for calculating the maximum power
dissipated, PDmax, may be used for a differential output
application:
P
Dmax +
2V2
DD
p2R
L
PDmax for a 5-V, 8- system is 0.64 W.
The maximum ambient temperature depends on the heat
sinking ability of the PCB system. The derating factor for
the 3 mm x 3 mm DRB package is shown in the dissipation
rating table. Converting this to
ΘJA:
Θ
JA +
1
Derating Factor
+
1
0.0218
+ 45.9°C W
Given
ΘJA, the maximum allowable junction temperature,
and the maximum internal dissipation, the maximum
ambient temperature can be calculated with the following
equation.
The
maximum
recommended
junction
temperature for the TPA6204A1 is 150
°C.
T
A Max + TJ Max * ΘJA PDmax
+ 150 * 45.9(0.64) + 120.6°C
Equation
(8)
shows
that
the
maximum
ambient
temperature is 120.6
°C (package limited to 85°C) at
maximum power dissipation with a 5-V supply.
Table 2 shows that for most applications no airflow is
required to keep junction temperatures in the specified
range. The TPA6204A1 is designed with thermal
protection that turns the device off when the junction
temperature surpasses 150
°C to prevent damage to the
IC. In addition, using speakers with an impedance higher
than 8-
dramatically increases the thermal performance
by reducing the output current.
Table 2. Efficiency and Maximum Ambient Temperature vs Output Power in 3.6-V 8-
BTL Systems
Output Power
(W)
Efficiency
(%)
Internal Dissipation
(W)
Power From Supply
(W)
Max Ambient Temperature (2)
(
°C)
0.1
27.6
0.262
0.36
85
0.2
39.0
0.312
0.51
85
0.5
61.7
0.310
0.81
85
0.6
67.6
0.288
0.89
85
(1) DRB package
(2) Package limited to 85°C ambient
Table 3. Efficiency and Maximum Ambient Temperature vs Output Power in 5-V 8-
Systems
Output Power
(W)
Efficiency
(%)
Internal Dissipation
(W)
Power From Supply
(W)
Max Ambient Temperature (2)
(
°C)
0.5
44.4
0.625
1.13
85
1
62.8
0.592
1.60
85
1.36
73.3
0.496
1.86
85
1.7
81.9
0.375
2.08
85
(1) DRB package
(2) Package limited to 85°C ambient
(6)
(7)
(8)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6204A1DRB | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud 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 |
| TPA6204A1DRB | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS AB, 1.7W, SON-8 |
| TPA6204A1DRBG4 | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud 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 |
| TPA6204A1DRBR | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud 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 |
| TPA6204A1DRBRG4 | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud 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 |
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