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| 型号： | TAS5414ATDKDMQ1G4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 116 W, 4 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | GREEN, PLASTIC, HSSOP-36 |
| 文件页数： | 8/54页 |
| 文件大小： | 1386K |
| 代理商： | TAS5414ATDKDMQ1G4 |
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SLOS535C
– MAY 2009 – REVISED APRIL 2011
DESCRIPTION OF OPERATION
OVERVIEW
The TAS5414A and TAS5424A are single-chip, four-channel, analog-input audio amplifiers for use in the
automotive environment. The design uses an ultra-efficient class-D technology developed by Texas Instruments,
but with changes needed by the automotive industry. This technology allows for reduced power consumption,
reduced heat, and reduced peak currents in the electrical system. The TAS5414A and TAS5424A realize an
audio sound system design with smaller size and lower weight than traditional class-AB solutions.
The TAS5414A and TAS5424A are composed of eight elements:
Preamplifier
PWM
Gate drive
Power FETs
Diagnostics
Protection
Power supply
I2C serial communication bus
Preamplifier
The preamplifier of the TAS5414A and TAS5424A is a high-input-impedance, low-noise, low-offset-voltage input
stage with adjustable gain. The high input impedance of the TAS5414A and TAS5424A allows the use of
low-cost 1-
μF input capacitors while still achieving extended low-frequency response. The preamplifier is
powered by a dedicated, internally regulated supply, which gives it excellent noise immunity and channel
separation. Also included in the preamp are:
1. Mute Pop-and-Click Control
—An audio input signal is reshaped and amplified as a step when a mute is
applied at the crest or trough of the signal. Such a step is perceived as a loud click. This is avoided in the
TAS5414A and TAS5424A by ramping the gain gradually when a mute or play command is received.
Another form of click and pop can be caused by the start or stopping of switching in a class-D amplifier. The
TAS5414A and TAS5424A incorporate a patented method to reduce the pop energy during the switching
startup and shutdown sequence. Fault conditions require rapid protection response by the TAS5414A and
the TAS5424A, which do not have time to ramp the gain down in a pop-free manner. The device transitions
into Hi-Z mode when an OV, UV, OC, OT, or DC fault is encountered. Also, activation of the STANDBY pin
may not be pop-free.
2. Gain Control
—The four gain settings are set in the preamplifier via I2C control registers. The gain is set
outside of the global feedback resistors of the TAS5414A and the TAS5424A, thus allowing for stability in the
system all gain settings with properly loaded conditions.
3. DC Offset Reduction Circuitry
—Circuitry has been incorporated to reduce the dc offset. DC offset in
high-gain amplifiers can produce audible clicks and pops when the amplifier is started or stopped. The offset
reduction circuitry can be disabled or enabled via I2C.
Pulse-Width Modulator (PWM)
The PWM converts the analog signal from the preamplifier into a switched signal of varying duty cycle. This is
the critical stage that defines the class-D architecture. In the TAS5414A and TAS5424A, the modulator is an
advanced design with high bandwidth, low noise, low distortion, excellent stability, and full 0
–100% modulation
capability. The patented PWM uses clipping recovery circuitry to eliminate the deep saturation characteristic of
PWMs when the input signal exceeds the modulator waveform.
Gate Drive
The gate driver accepts the low-voltage PWM signal and level shifts it to drive a high-current, full-bridge, power
FET stage. The TAS5414A and TAS5424A use patent-pending techniques to avoid shoot-through and are
optimized for EMI and audio performance.
16
Copyright
2009–2011, Texas Instruments Incorporated
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| TAS5414ATDKDQ1 | 功能描述:音频放大器 4-Ch Auto Dig Amps 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 |
| TAS5414ATDKDQ1G4 | 功能描述:音频放大器 4-Ch Auto Dig Amps 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 |
| TAS5414ATDKDRMQ1 | 功能描述:音频放大器 4-Ch Auto Dig Amps 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 |
| TAS5414ATDKDRMQ1G4 | 功能描述:音频放大器 4-Ch Auto Dig Amps 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 |
| TAS5414ATDKDRQ1 | 功能描述:音频放大器 4-Ch Auto Dig Amps 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 |
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