參數(shù)資料
型號(hào)： TPA6011A4PWPG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 11/35頁(yè)
文件大小： 744K
代理商： TPA6011A4PWPG4
www.ti.com
FADE OPERATION
TPA6011A4
SLOS392A – FEBRUARY 2002 – REVISED JULY 2004
Table 3. HP/LINE, SE/BTL, and Shutdown Functions
INPUTS(1)
AMPLIFIER STATE
HP/LINE
SE/BTL
SHUTDOWN
INPUT
OUTPUT
X
Low
X
Mute
Low
High
Line
BTL
Low
High
Line
SE
High
Low
High
HP
BTL
High
HP
SE
(1)
Inputs should never be left unconnected.
For design flexibility, a fade mode is provided to slowly ramp up the amplifier gain when coming out of shutdown
mode and conversely ramp the gain down when going into shutdown. This mode provides a smooth transition
between the active and shutdown states and virtually eliminates any pops or clicks on the outputs.
When the FADE input is a logic low, the device is placed into fade-on mode. A logic high on this pin places the
amplifier in the fade-off mode. The voltage trip levels for a logic low (VIL) or logic high (VIH) can be found in the
recommended operating conditions table.
When a logic low is applied to the FADE pin and a logic low is then applied on the SHUTDOWN pin, the channel
gain steps down from gain step to gain step at a rate of two clock cycles per step. With a nominal internal clock
frequency of 58 Hz, this equates to 34 ms (1/24 Hz) per step. The gain steps down until the lowest gain step is
reached. The time it takes to reach this step depends on the gain setting prior to placing the device in shutdown.
For example, if the amplifier is in the highest gain mode of 20 dB, the time it takes to ramp down the channel
gain is 1.05 seconds. This number is calculated by taking the number of steps to reach the lowest gain from the
highest gain, or 31 steps, and multiplying by the time per step, or 34 ms.
After the channel gain is stepped down to the lowest gain, the amplifier begins discharging the bypass capacitor
from the nominal voltage of VDD/2 to ground. This time is dependent on the value of the bypass capacitor. For a
0.47-F capacitor that is used in the application diagram in Figure 28, the time is approximately 500 ms. This
time scales linearly with the value of bypass capacitor. For example, if a 1-F capacitor is used for bypass, the
time period to discharge the capacitor to ground is twice that of the 0.47-F capacitor, or 1 second. Figure 30
below is a waveform captured at the output during the shutdown sequence when the part is in fade-on mode.
The gain is set to the highest level and the output is at VDD when the amplifier is shut down.
When a logic high is placed on the SHUTDOWN pin and the FADE pin is still held low, the device begins the
start-up process. The bypass capacitor will begin charging. Once the bypass voltage reaches the final value of
VDD/2, the gain increases in 2-dB steps from the lowest gain level to the gain level set by the dc voltage applied
to the VOLUME, SEDIFF, and SEMAX pins.
In the fade-off mode, the amplifier stores the gain value prior to starting the shutdown sequence. The output of
the amplifier immediately drops to VDD/2 and the bypass capacitor begins a smooth discharge to ground. When
shutdown is released, the bypass capacitor charges up to VDD/2 and the channel gain returns immediately to the
value stored in memory. Figure 31 below is a waveform captured at the output during the shutdown sequence
when the part is in the fade-off mode. The gain is set to the highest level, and the output is at VDD when the
amplifier is shut down.
The power-up sequence is different from the shutdown sequence and the voltage on the FADE pin does not
change the power-up sequence. Upon a power-up condition, the TPA6011A4 begins in the lowest gain setting
and steps up 2 dB every 2 clock cycles until the final value is reached as determined by the dc voltage applied to
the VOLUME, SEDIFF, and SEMAX pins.
19
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TPA6011A4PWPR 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TPA6011A4PWPRG4 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TPA6012A4 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:3-W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
TPA6012A4PWP 功能描述:音頻放大器 2W Stereo Audio Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TPA6012A4PWPEVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA6012A4PWP Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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