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參數(shù)資料
| 型號： | TPA3007D1PWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 451K |
| 代理商： | TPA3007D1PWR |
www.ti.com
THERMAL CONSIDERATION: OUTPUT POWER AND RECOMMENDED
T
A(max)
+ T
J
*
θ
JA
P
Dissipated
where : T
J
+ 125
°C
θ
JA
+
1
derating factor
+
1
0.01145
+ 87.3
°C W
(2)
P
Dissipated +
P
O(average)
1
Efficiency
–1
Efficiency +X 85% for an 8-W load
(3)
GAIN SETTING VIA GAIN0 AND GAIN1 INPUTS
INPUT RESISTANCE
SLOS418D – SEPTEMBER 2003 – REVISED MARCH 2008
AMBIENT TEMPERATURE
To calculate the maximum ambient temperature, this equation can be used:
(The derating factor for the 24-pin PW package is given in the dissipation rating table.)
To estimate the power dissipation, this equation can be used:
Example: What is the maximum ambient temperature for an application that requires the TPA3007D1 to drive
3 W into an 8-
speaker?
PDissipated = 3 W x ((1 / 0.85) - 1) = 0.529 W
TAmax = 125°C - (87.3°C/W x 0.529 W) = 78.8°C
This calculation shows that the TPA3007D1 can drive 3 W into an 8-
speaker up to the absolute maximum
ambient temperature rating of 78.8
°C, which must never be exceeded.
The gain of the TPA3007D1 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 2 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance (ZI) to be dependent on the gain setting. The actual gain settings are controlled by
ratios of resistors, so the gain variation from part-to-part is small. However, the input impedance may shift by
30% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 23 k
, which is the absolute minimum input impedance of the TPA3007D1. At the lower gain
settings, the input impedance could increase as high as 313 k
.
Table 2. Gain Settings
AMPLIFIER GAIN
INPUT IMPEDANCE
(dB)
(k
)
GAIN1
GAIN0
TYP
0
12
241
0
1
18
168
1
0
23.6
104
1
36
33
Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest
value to over six times that value. As a result, if a single capacitor is used in the input high-pass filter, the -3 B or
cutoff frequency also changes by over six times.
14
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA3007D1
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| TPA3007D1PWRG4 | 功能描述:音頻放大器 Mono Med Power Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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| TPA3008D2PHP | 功能描述:音頻放大器 10-W Stereo Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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