參數(shù)資料
型號(hào)： TPA3120D2_07
廠商： Texas Instruments, Inc.
英文描述： 25-W STEREO CLASS-D AUDIO POWER AMPLIFIER
中文描述： 25 W立體聲D類音頻功率放大器
文件頁(yè)數(shù)： 15/27頁(yè)
文件大小： 631K
代理商： TPA3120D2_07
www.ti.com
Output Filter and Frequency Response
For the best frequency response, a flat passband output filter (second order Butterworth) may be used. The
output filter components consist of the series inductor and capacitor to ground at the LOUT and ROUT pins.
There are several possible configurations depending on the speaker impedance, and whether the output
configuration is single ended (SE) or bridge tied load (BTL).
Table 3
list the recommended values for the filter
components. It is important to use a high quality capacitor in this application. A rating of at least X7R is required.
LOUT / ROUT
L
filter
C
filter
LOUT
L
filter
C
filter
L
filter
C
filter
ROUT
Power Supply Decoupling, C
S
The TPA3120D2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling
to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also
prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that target different types of noise on the power supply leads.
For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance
(ESR) ceramic capacitor, typically 0.1
μ
F to 1 μF placed as close as possible to the device V
CC
lead works best.
For filtering lower frequency noise signals, a larger aluminum electrolytic capacitor of 470
μ
F or greater placed
near the audio power amplifier is recommended. The 470-
μ
F capacitor also serves as local storage capacitor for
supplying current during large signal transients on the amplifier outputs. The PVCC terminals provide the power
to the output transistors, so a 470-μF or larger capacitor should be placed on each PVCC terminal. A 10-μF
capacitor on the AVCC terminal is adequate. These capacitors need to be properly derated for voltage and
ripple current rating to insure reliability.
BSN and BSP Capacitors
The half H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the
high side of each output to turn on correctly. A 220-nF ceramic capacitor, rated for at least 25 V, must be
connected from each output to its corresponding bootstrap input. Specifically, one 220-nF capacitor must be
connected from LOUT to BSL, and one 220-nF capacitor must be connected from ROUT to BSR.
TPA3120D2
SLOS507C–MARCH 2007–REVISED MAY 2007
Table 3. Recommended Filter Output Components
Output Configuration
Speaker Impedance (
)
4
8
4
8
Filter Inductor (
μ
H)
22
47
10
22
Filter Capacitor (nF)
680
390
1500
680
Single Ended (SE)
Bridge Tied Load (BTL)
Figure 25. BTL Filter Configuration
Figure 26. SE Filter Configuration
The bootstrap capacitors connected between the BSx pins and corresponding output function as a floating
power supply for the high-side N-channel power MOSFET gate drive circuitry. During each high-side switching
cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high-side MOSFETs
turned on.
15
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參數(shù)描述
TPA3120D2EVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA3120D2 Evaluation Module RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TPA3120D2PWP 功能描述:音頻放大器 25-W Stereo 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
TPA3120D2PWP 制造商:Texas Instruments 功能描述:Audio Power Amplifiers
TPA3120D2PWPG4 功能描述:音頻放大器 25W Stereo Class D Aud Pwr Amp 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
TPA3120D2PWPR 功能描述:音頻放大器 25-W Stereo 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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