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參數(shù)資料
| 型號： | TPA3000D1 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 17-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 17單聲道無濾波器D類音頻功率放大器 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大小： | 273K |
| 代理商： | TPA3000D1 |
TPA3000D1
SLOS379A
–
SEPTEMBER 2001
–
REVISED JANUARY 2002
16
www.ti.com
APPLICATION INFORMATION
power supply decoupling, C
S
The TPA3000D1 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling
to ensure 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 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 10
μ
F or greater placed near
the audio power amplifier is recommended.
BSN and BSP capacitors
The full H-bridge output stage uses only NMOS transistors. It therefore requires bootstrap capacitors for the
high side of each output to turn on correctly. A 10-nF ceramic capacitor, rated for at least 25 V, must be connected
from each output to its corresponding bootstrap input. Specifically, one 10-nF capacitor must be connected from
OUTP to BSP, and one 10-nF capacitor must be connected from OUTN to BSN. (See the evaluation circuit
diagram at the end of this data sheet.)
VCLAMP capacitors
To ensure that the maximum gate-to-source voltage for the NMOS output transistors is not exceeded, an internal
regulator clamps the gate voltage. A 0.1-
μ
F capacitor must be connected from VCLAMP (pin 7) to ground and
must be rated for at least 25 V. The voltage at VCLAMP (pin 7) varies with V
CC
and may not be used for powering
any other circuitry.
midrail bypass capacitor, C
BYPASS
The midrail bypass capacitor (C
BYPASS
) is the most critical capacitor and serves several important functions.
During start-up or recovery from shutdown mode, C
BYPASS
determines the rate at which the amplifier starts up.
The second function is to reduce noise produced by the power supply caused by coupling into the output drive
signal. This noise is from the midrail generation circuit internal to the amplifier, which appears as degraded
PSRR and THD+N.
Bypass capacitor (C
BYPASS
) values of 0.47-
μ
F to 1-
μ
F ceramic or tantalum low-ESR capacitors are
recommended for the best THD noise, and depop performance.
VREF decoupling capacitor
The VREF terminal (pin 23) is the output of an internally-generated 5-V supply, used for the oscillator and gain
setting logic. It requires a 0.1-
μ
F to 1-
μ
F capacitor to ground to keep the regulator stable. The regulator may
not be used to power any additional circuitry.
differential input
The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel.
To use the TPA3000D1 EVM with a differential source, connect the positive lead of the audio source to the INP
input and the negative lead from the audio source to the INN input. To use the TPA3000D1 with a single-ended
source, ac ground the INN input through a capacitor and apply the audio single to the input. In a single-ended
input application, the INN input should be ac-grounded at the audio source instead of at the device input for best
noise performance.
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| TPA3000D1PWPR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AUDIO AMPLIFIER|SINGLE|CMOS|TSSOP|20PIN|PLASTIC |
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