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參數(shù)資料
| 型號： | TPA2000D1TPWRG4Q1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 307K |
| 代理商： | TPA2000D1TPWRG4Q1 |
When to Use An Output Filter
C2
C1
L1
L2
OUT
OUT+
Gain Setting Via GAIN0 and GAIN1 Inputs
www.ti.com ........................................................................................................................................ SGLS137E – SEPTEMBER 2002 – REVISED OCTOBER 2008
damage could occur to the speaker if the voice coil is not designed to handle the additional power. To size the
speaker for added power, the ripple current dissipated in the load needs to be calculated by subtracting the
theoretical supplied power (PSUP THEORETICAL) from the actual supply power (PSUP) at maximum output power
(POUT). The switching power dissipated in the speaker is the inverse of the measured efficiency (ηMEASURED)
minus the theoretical efficiency (
η
THEORETICAL) all multiplied by POUT.
PSPKR = PSUP – PSUP THEORETICAL (at max output power)
(1)
PSPKR = POUT(PSUP/POUT – PSUP THEORETICAL/POUT) (at max output power)
(2)
PSPKR = POUT(1/ηTHEORETICAL – 1/ηTHEORETICAL) (at max output power)
(3)
The maximum efficiency of the TPA2000D1 with an 8-
load is 85%. Using Equation 3 with the efficiency at
maximum power (78%), we see that there is an additional 106 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 TPA2000D1 without the filter if the traces from amplifier to speaker are short. The TPA2000D1
passed FCC and CE radiated emissions with no shielding with speaker wires eight inches long or less. Notebook
PCs and powered speakers where the speaker is in the same enclosure as the amplifier are good applications
for class-D without a filter.
A ferrite bead filter (shown in Figure 11) often can be used if the design is failing radiated emissions without a
filter, and the frequency sensitive circuit is greater than 1 MHz. This is good for circuits that have to pass only
FCC and CE because FCC and CE test only 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 output filter if the EMI sensitive circuits are low frequency (<1 MHz) and/or the leads from amplifier to
speaker are long.
The LC output filter is shown in Figure 11.
L1 = L2 = 22 H (DCR = 110 m, part number = SCD0703T-220 M-S, manufacturer = GCI)
C1 = C2 = 1 F
The ferrite filter is shown in Figure 11, where L is a ferrite bead.
L1 = L2 = ferrite bead (part number = MPZ1608S221, manufacturer = TDKI)
C1 = C2 = 1 nF
Figure 11. Class-D Output Filter
The gain of the TPA2000D1 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 actual gain distribution from part-to-part is quite good. 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 20 k
, which is the absolute minimum input impedance of the TPA2000D1. At the higher gain
settings, the input impedance could increase as high as 115 k
.
Copyright 2002–2008, Texas Instruments Incorporated
11
Product Folder Link(s): TPA2000D1-Q1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA2000D1TPWRQ1 | 功能描述:音頻放大器 Auto Cat Mono 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 |
| TPA2000D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2000D2_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2000D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA2000D2 Eval Mod 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 |
| TPA2000D2PW | 功能描述:音頻放大器 Stereo 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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