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參數資料
| 型號： | TPA2014D1YZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA16 |
| 封裝： | 2.275 X 2.275 MM, GREEN, DSBGA-16 |
| 文件頁數： | 9/27頁 |
| 文件大小： | 945K |
| 代理商： | TPA2014D1YZHT |
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FILTER FREE OPERATION AND FERRITE BEAD FILTERS
1nF
Ferrite
ChipBead
OUTP
OUTN
1nF
Ferrite
ChipBead
OPERATION WITH DACs AND CODECs
BYPASSING THE BOOST CONVERTER
www.ti.com ............................................................................................................................................................... SLAS559A – MAY 2008 – REVISED JUNE 2008
A ferrite bead filter is often 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 a 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 16 shows a typical ferrite bead output filters.
Figure 16. Typical Ferrite Chip Bead Filter
Suggested Chip Ferrite Bead
Load
Vendor
Part Number
Size
8
Murata
BLM18EG121SN1
0603
When using switching amplifiers with CODECs and DACs, there may be 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 is 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 TPA2014D1 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 TPA2014D1 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.
Bypass the boost converter to drive the Class-D amplifier directly from the battery. Place a Shottky diode
between the SW pin and the VCCIN pin. Select a diode that has an average forward current rating of at least 1A,
reverse breakdown voltage of 10 V or greater, and a forward voltage as small as possible. See Figure 17 for an
example of a circuit designed to bypass the boost converter.
Do not configure the circuit to bypass the boost converter if VDD is higher than VCC when the boost converter is
enabled (SDb
≥ 1.3 V); VDD must be lower than VCC for proper operation. VDD may be set to any voltage within
the recommended operating range when the boost converter is disabled (SDb
≤ 0.3V).
Place a logic high on SDb to place the TPA2014D1 in boost mode. Place a logic low on SDb to place the
TPA2014D1 in bypass mode.
Copyright 2008, Texas Instruments Incorporated
17
Product Folder Link(s): TPA2014D1
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| TPA2015D1_11 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2 W Constant Output Power Class-D Audio Amplifier With Adaptive Boost Converter andBattery Tracking SpeakerGuard? AGC |
| TPA2015D1YZHEVM | 功能描述:音頻 IC 開發工具 TPA2015D1YZHEVM 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 |
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