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参数资料
| 型号： | TAS5112DFD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 62 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO56 |
| 封装： | GREEN, PLASTIC, HTSSOP-56 |
| 文件页数： | 5/21页 |
| 文件大小： | 455K |
| 代理商： | TAS5112DFD |
TAS5112
SLES048C JULY 2003 REVISED MARCH 2004
www.ti.com
13
Timing and Function
The function of the autorecovery circuit is as follows:
1.
An error event occurs and sets the
protection latch (output stage goes Hi-Z).
2.
The counter is started.
3.
After n/2 cycles, the protection latch is
cleared but the output stage remains Hi-Z
(identical to pulling RESET low).
4.
After
n cycles, operation is resumed
(identical to pulling RESET high) (n = 512).
Error
Protection
Latch
Shutdown
Autorecovery
SD
PWM
Counter
AR-RESET
Figure 10. Autorecovery Function
Latching Shutdown on All Errors (PMODE1)
In latching shutdown mode, all error situations result in a
power down (output stage Hi-Z). Re-enabling can be done
by toggling the RESET pin.
All Protection Systems Disabled (PMODE2)
In PMODE2, all protection systems are disabled. This
mode is purely intended for testing and characterization
purposes and thus not recommended for normal device
operation.
MODE Pins Selection
The protection mode is selected by shorting M1/M2 to
DREG or DGND according to Table 2.
Table 2. Protection Mode Selection
M1
M2
PROTECTION MODE
0
Autorecovery after errors (PMODE 0)
0
1
Latching shutdown on all errors (PMODE 1)
1
0
All protection systems disabled (PMODE 2)
1
Reserved
The output configuration mode is selected by shorting the
M3 pin to DREG or DGND according to Table 3.
Table 3. Output Mode Selection
M3
OUTPUT MODE
0
Bridge-tied load output stage (BTL)
1
Reserved
APPLICATION INFORMATION
DEMODULATION FILTER DESIGN
The PurePath Digital amplifier outputs are driven by
heavy-duty
DMOS
transistors
in
an
H-bridge
configuration. These transistors are either off or fully on,
which reduces the DMOS transistor on-state resistance,
R(DMOSon), and the power dissipated in the device,
thereby increasing efficiency.
The result is a square-wave output signal with a duty cycle
that is proportional to the amplitude of the audio signal. It
is recommended that a second-order LC filter be used to
recover the audio signal. For this application, EMI is
considered important; therefore, the selected filter is the
full-output type shown in Figure 11.
Output A
C1A
TAS51xx
L
Output B
L
C1B
C2
R(Load)
Figure 11. Demodulation Filter
The main purpose of the output filter is to attenuate the
high-frequency switching component of the PurePath
Digital amplifier while preserving the signals in the audio
band.
Design of the demodulation filter affects the performance
of the power amplifier significantly. As a result, to ensure
proper operation of the overcurrent (OC) protection circuit
and meet the device THD+N specifications, the selection
of the inductors used in the output filter must be considered
according to the following. The rule is that the inductance
should remain stable within the range of peak current seen
at maximum output power and deliver at least 5
H of
inductance at 15 A.
If this rule is observed, the TAS5112 does not have
distortion issues due to the output inductors and
overcurrent conditions do not occur due to inductor
saturation in the output filter.
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相关代理商/技术参数 |
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| TAS5112DFDG4 | 功能描述:音频放大器 Dig Amp Stereo Power Stage RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5112DFDR | 功能描述:音频放大器 Dig Amp Stereo Power Stage RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5112DFDRG4 | 功能描述:音频放大器 Dig Amp Stereo Power Stage RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5121 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DIGITAL AMPLIFIER POWER STAGE |
| TAS5121_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DIGITAL AMPLIIFIER POWER STAGE |
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