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參數(shù)資料
| 型號： | MPZ2012S101A |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2.7-W CONSTANT OUTPUT POWER CLASS-D AUDIO AMPLIFIER WITH INTEGRATED BOOST CONVERTER |
| 中文描述： | 2.7鎢恒定輸出功率D類音頻放大器，具有集成升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 753K |
| 代理商： | MPZ2012S101A |
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FILTER FREE OPERATION AND FERRITE BEAD FILTERS
1nF
Ferrite
ChipBead
OUTP
OUTN
1nF
Ferrite
ChipBead
OPERATION WITH DACs AND CODECs
STEREO OPERATION APPLICATION
TPA2013D1
SLOS520 – AUGUST 2007
Any mismatch in capacitance between the two inputs inputs will cause a mismatch in the corner frequencies.
Choose capacitors with a tolerance of ±10% or better.
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 31 shows a typical ferrite bead output filters.
Figure 31. Typical Ferrite Chip Bead Filter
Suggested Chip Ferrite Bead
Load
Vendor
Part Number
Size
8
Murata
BLM18EG121SN1
0603
4
TDK
MPZ2012S101A
0805
When using switching 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 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.
The TPA2013D1 has a two pole low pass filter at the inputs. The cutoff frequency of the filter is set to
approximately 100kHz. The integrated low pass filter of the TPA2013D1 eliminates the need for additional
external filtering components. A properly designed additional low pass filter may be added without altering the
performance of the device.
Use the boost converter of the TPA2013D1 to supply the power for another audio amplifier when stereo
operation is required. Ensure the gains of the amplifiers match each other. This prevents one channel from
sounding louder than the other. Use Equation 1 through Equation 5 to determine R1, R2, boost inductor, and the
boost capacitor values. Figure 32 is an example schematic. The TPA2032D1 is a good choice for this
application; the gain is internally set to 2 V/V, the power supply is compatible with VCCOUT of the TPA2013D1,
and the output power of the TPA2032D1 is on par with the TPA2013D1.
18
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPA2013D1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPZ2012S101AT | 制造商:TDK Innoveta 功能描述:Ferrite Beads Multi-Layer Chip Bead 100Ohm 25% 100MHz 4A 0805 T/R |
| MPZ2012S101AT000 | 制造商:TDK 功能描述: |
| MPZ2012S101ATD25 | 制造商:TDK 功能描述:FERRITE CHIP BEADS - Tape and Reel |
| MPZ2012S102A | 功能描述:電磁干擾濾波珠子、扼流圈和陣列 0805 1000ohms 100MHz Rdc 0.15ohms 1.5A RoHS:否 制造商:AVX 阻抗: 最大直流電流:35 mA 最大直流電阻: 容差: 端接類型:SMD/SMT 電壓額定值:25 V 工作溫度范圍:- 25 C to + 85 C 封裝 / 箱體:0603 (1608 metric) |
| MPZ2012S102AT | 制造商:TDK 功能描述:Ferrite Beads Multi-Layer Chip Bead 1KOhm 25% 100MHz 1.5A 0805 制造商:TDK 功能描述:MPZ Series 1 kO 25 % 100 MHz 1.5 A 0805 Multi-Layer Chip Ferrite Bead 制造商:TDK 功能描述:MPZ Series 1 kO ?25 % 100 MHz 1.5 A 0805 Multi-Layer Chip Ferrite Bead |
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