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參數(shù)資料
| 型號： | TPA2012D2RTJT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大?。?/td> | 785K |
| 代理商： | TPA2012D2RTJT |
Trace Width
EFFICIENCY AND THERMAL INFORMATION
q
JA
+
1
Derating Factor
+
1
0.041
+ 24
°C W
(3)
T
A
Max + TJMax * qJAPDmax + 150 * 24 (1.5) + 114°C
(4)
OPERATION WITH DACs AND CODECs
FILTER FREE OPERATION AND FERRITE BEAD FILTERS
1 nF
Ferrite
Chip Bead
OUTP
OUTN
Ferrite
Chip Bead
1 nF
SLOS438D – DECEMBER 2004 – REVISED JUNE 2008 .................................................................................................................................................. www.ti.com
Recommended trace width at the solder balls is 75
m to 100 m to prevent solder wicking onto wider PCB
traces.
For high current pins (PVDD, PGND, and audio output pins) of the TPA2012D2, use 100-m trace widths at the
solder balls and at least 500-
m PCB traces to ensure proper performance and output power for the device.
For the remaining signals of the TPA2012D2, use 75-
m to 100-m trace widths at the solder balls. The audio
input pins (INR+/- and INL+/-) must run side-by-side to maximize common-mode noise cancellation.
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 QFN package:
Given
θ
JA of 24°C/W, the maximum allowable junction temperature of 150°C, and the maximum internal
dissipation of 1.5W (0.75 W per channel) for 2.1 W per channel, 4-
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 114°C at maximum power dissipation
with a 5-V supply and 4-
a load. The TPA2012D2 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 4-
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 Figure 33 for the 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 very 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 37 shows typical ferrite bead and LC output filters.
Figure 37. Typical Ferrite Chip Bead Filter (Chip bead example: TDK: MPZ1608S221A)
14
Copyright 2004–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2012D2
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相關(guān)代理商/技術(shù)參數(shù) |
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| TPA2012D2RTJTG4 | 功能描述:音頻放大器 2.1W Stereo Class-D Aud Power Amplifier 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 |
| TPA2012D2YZH | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.1 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| TPA2012D2YZHR | 功能描述:音頻放大器 2.1W Stereo Class-D Aud Power Amplifier 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 |
| TPA2012D2YZHT | 功能描述:音頻放大器 2.1W Stereo Class-D Aud Power Amplifier 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 |
| TPA2013D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.7-W CONSTANT OUTPUT POWER CLASS-D AUDIO AMPLIFIER WITH INTEGRATED BOOST CONVERTER |
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