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參數(shù)資料
| 型號： | TPA2006D1DRB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1.45-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER WITH 1.8-V COMPATIBLE INPUT THRESHOLDS |
| 中文描述： | 1.45單聲道無濾波器D類音頻功率放大器，1.8 - V兼容輸入閾值 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 750K |
| 代理商： | TPA2006D1DRB |
www.ti.com
EFFICIENCY AND THERMAL INFORMATION
The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor
for the DRB package is shown in the dissipation rating table. Converting this to
θ
JA
:
=
1
Derating Factor
1
0.0218
= 45.9 C/W
q
JA
=
(17)
T
A
JA Dmax
Max = T Max
= 125
45.9(0.2) = 115.8 C
- q
-
(18)
ELIMINATING THE OUTPUT FILTER WITH THE TPA2006D1
This section focuses on why the user can eliminate the output filter with the TPA2006D1.
Effect on Audio
Traditional Class-D Modulation Scheme
0 V
-5 V
+5 V
Current
OUT+
Differential Voltage
Across Load
OUT-
TPA2006D1
SLOS498–SEPTEMBER 2006
Given
θ
JA
of 45.9
°
C/W, the maximum allowable junction temperature of 125
°
C, and the maximum internal
dissipation of 0.2 W (Po=1.45 W, 8-
load, 5-V supply, from
Figure 2
), the maximum ambient temperature can
be calculated with the following equation.
Equation 18
shows that the calculated maximum ambient temperature is 115.8
°
C at maximum power dissipation
with a 5-V supply and 8-
a load, see
Figure 2
. The TPA2006D1 is designed with thermal protection that turns
the device off when the junction temperature surpasses 150
°
C to prevent damage to the IC.
The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching
waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the
frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are
much greater than 20 kHz, so the only signal heard is the amplified input audio signal.
The traditional class-D modulation scheme, which is used in the TPA005Dxx family, has a differential output
where each output is 180 degrees out of phase and changes from ground to the supply voltage, V
DD
. Therefore,
the differential pre-filtered output varies between positive and negative V
DD
, where filtered 50% duty cycle yields
0 volts across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown
in
Figure 27
. Note that even at an average of 0 volts across the load (50% duty cycle), the current to the load is
high causing a high loss and thus causing a high supply current.
Figure 27. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an
Inductive Load With no Input
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA2006D1DRBR | 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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 |
| TPA2006D1DRBRG4 | 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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 |
| TPA2006D1DRBT | 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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 |
| TPA2006D1DRBTG4 | 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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 |
| TPA2006D1EVM | 功能描述:音頻 IC 開發(fā)工具 AUD POWER AMP 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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