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| 型号： | TPA2005D1DGNG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 11/32页 |
| 文件大小： | 1128K |
| 代理商： | TPA2005D1DGNG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页当前第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
P
SPKR +
P
SUP
–P
SUP THEORETICAL
(at max output power)
(19)
P
SPKR +
P
SUP
P
OUT
–
P
SUP THEORETICAL
P
OUT
(at max output power)
(20)
P
SPKR +
P
OUT
1
hMEASURED *
1
hTHEORETICAL
(at max output power)
(21)
hTHEORETICAL
+
R
L
R
L )
2r
DS(on)
(at max output power)
(22)
When to Use an Output Filter
1 nF
Ferrite
Chip Bead
OUTP
OUTN
Ferrite
Chip Bead
1 nF
1
F
1
F
33
H
33
H
OUTP
OUTN
www.ti.com............................................................................................................................................................... SLOS369F – JULY 2002 – REVISED JULY 2008
The maximum efficiency of the TPA2005D1 with a 3.6 V supply and an 8-
load is 86% from equation
Equation 22. Using equation Equation 21 with the efficiency at maximum power (84%), we see that there is an
additional 17 mW dissipated in the speaker. The added power dissipated in the speaker is not an issue as long
as it is taken into account when choosing the speaker.
Design the TPA2005D1 without an output filter if the traces from amplifier to speaker are short. The TPA2005D1
passed FCC and CE radiated emissions with no shielding with speaker trace wires 100 mm long or less.
Wireless handsets and PDAs are great applications for class-D without a filter.
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 is good for circuits that just have to pass FCC and CE
because FCC and CE only test radiated emissions greater than 30 MHz. If choosing a ferrite bead, choose one
with high impedance at high frequencies, but low impedance at low frequencies.
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 41. Typical Ferrite Chip Bead Filter (Chip bead example: NEC/Tokin: N2012ZPS121)
Figure 42. Typical LC Output Filter, Cutoff Frequency of 27 kHz
Copyright 2002–2008, Texas Instruments Incorporated
19
Product Folder Link(s): TPA2005D1
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA2005D1DGNR | 功能描述:音频放大器 Mono Fully Diff Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2005D1DGNRG4 | 功能描述:音频放大器 Mono Fully Diff Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2005D1DGNRQ1 | 功能描述:音频放大器 1.4W Class D Audio Power Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2005D1DRBQ1 | 功能描述:音频放大器 1.4-W Mono Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2005D1DRBR | 功能描述:音频放大器 Mono Fully Diff Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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