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參數資料
| 型號： | TPA2054D4YZKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.94 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA25 |
| 封裝： | 2.61 X 2.61 MM, GREEN, DSBGA-25 |
| 文件頁數： | 16/28頁 |
| 文件大小： | 949K |
| 代理商： | TPA2054D4YZKR |
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EFFICIENCY AND THERMAL INFORMATION
JA
1
=
= 111 C/W
Derating Factor
0.009
q
°
(3)
A
J
JA DMAX
T Max = T Max
θ
P
= 150
111(0.12) = 137 C
-
°
(4)
OPERATION WITH DACS AND CODECS
FILTER FREE OPERATION AND FERRITE BEAD FILTERS
Ferrite
ChipBead
Ferrite
ChipBead
1nF
OUTP
OUTN
www.ti.com ..................................................................................................................................................................................................... SLOS607 – APRIL 2009
The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor
for the packages are shown in the dissipation rating table. Converting this to
θ
JA for the WCSP package:
Given
θ
JA of 111°C/W, the maximum allowable junction temperature of 150°C, and the maximum internal
dissipation of 0.12 W (0.06 W per channel) for 1.4 W per channel, 8-
load, 5-V supply, from Figure 25 , the
maximum ambient temperature can be calculated with the following equation:
Equation 4 shows that the calculated maximum ambient temperature is 137°C at maximum power dissipation
with a 5-V supply and 8-
a load. The TPA2054D4 is designed with thermal protection that turns the device off
when the junction temperature surpasses 150°C to prevent damage to the IC. Also, using speakers more
resistive than 8-
dramatically increases the thermal performance by reducing the output current and increasing
the efficiency of the amplifier.
In using Class-D amplifiers with CODECs and DACs, sometimes there is an increase in the output noise floor
from the audio amplifier. This occurs when mixing of the output frequencies of the CODEC/DAC mix with the
switching frequencies of the audio amplifier input stage. The noise increase can be solved by placing a low-pass
filter between the CODEC/DAC and audio amplifier. This filters off the high frequencies that cause the problem
and allow proper performance. See the functional block diagram.
A ferrite bead filter can often be used if the design is failing radiated emissions without an LC filter and the
frequency sensitive circuit is greater than 1 MHz. This filter functions well for circuits that just have to pass FCC
and CE because FCC and CE only test radiated emissions greater than 30 MHz. When choosing a ferrite bead,
choose one with high impedance at high frequencies, and low impedance at low frequencies. In addition, select a
ferrite bead with adequate current rating to prevent distortion of the output signal.
Use an LC output filter if there are low frequency (< 1 MHz) EMI sensitive circuits and/or there are long leads
from amplifier to speaker. Figure 49 shows typical ferrite bead and LC output filters.
Figure 49. Typical Ferrite Bead Filter (Chip bead example: TDK: MPZ1608S221A)
Copyright 2009, Texas Instruments Incorporated
23
Product Folder Link(s): TPA2054D4
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相關代理商/技術參數 |
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| TPA2054D4YZKT | 功能描述:音頻放大器 1.4 W/Ch Stereo Class-D Aud Subsys 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 |
| TPA2080D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.2 W Constant Output Power Class-D Audio Amplifier with Class-G Boost Converter |
| TPA2080D1YZGEVM | 功能描述:音頻 IC 開發工具 TPA2080D1 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA2080D1YZGR | 功能描述:音頻放大器 2.2W Const Out Pwr Class-D Audio 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 |
| TPA2080D1YZGT | 功能描述:音頻放大器 2.2W Const Out Pwr Class-D Audio 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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