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參數資料
| 型號： | TPA2008D2PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數： | 10/26頁 |
| 文件大?。?/td> | 691K |
| 代理商： | TPA2008D2PWPRG4 |
www.ti.com
Ci ≤ CBYP / 10
(9)
POWER SUPPLY DECOUPLING, CS
MIDRAIL BYPASS CAPACITOR, CBYP
CBYP ≥ 10 × Ci
(10)
DIFFERENTIAL INPUT
SHUTDOWN MODES
TPA2008D2
SLOS413C – JULY 2003 – REVISED MAY 2004
APPLICATION INFORMATION (continued)
A further consideration for this capacitor is the leakage path from the input source through the input network (Ci)
and the feedback network to the load. This leakage current creates a dc offset voltage at the input to the
amplifier that reduces useful headroom, especially in high gain applications. For this reason a low-leakage
tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the
capacitor should face the amplifier input in most applications as the dc level there is held at VDD/2, which is likely
higher than the source dc level. Note that it is important to confirm the capacitor polarity in the application.
Ci must be 10 times smaller than the bypass capacitor to reduce clicking and popping noise from power on/off
and entering and leaving shutdown. After sizing Ci for a given cutoff frequency, size the bypass capacitor to 10
times that of the input capacitor.
The TPA2008D2 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. 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 F, placed as close as possible to the device VDD terminal works best. For
filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10 F or greater placed near
the audio power amplifier is recommended.
The midrail bypass capacitor (CBYP) is the most critical capacitor and serves several important functions. During
start-up or recovery from shutdown mode, CBYP 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 (CBYP) values of 0.47-F to 1-F ceramic or tantalum low-ESR capacitors are recommended for
the best THD and noise performance.
Increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving
shutdown. To have minimal pop, CBYP should be 10 times larger than Ci.
The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To
use the TPA2008D2 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 TPA2008D2 with a single-ended
source, ac ground either input through a capacitor and apply the audio signal to the remaining input. In a
single-ended input application, the unused input should be ac-grounded at the audio source instead of at the
device input for best noise performance.
The TPA2008D2 employs a shutdown mode of operation designed to reduce supply current (IDD) to the absolute
minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should
be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs to
mute and the amplifier to enter a low-current state, IDD(SD) = 1 A. SHUTDOWN should never be left
unconnected because the amplifier state would be unpredictable.
18
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