| TI TPA2014D1 D类音频放大方案 |
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| 作者：未知 来源：TI公司 点击数：115 更新时间：2008-5-21 |
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TI公司的TPA2014D1是无滤波器的D类音频放大器,它集成了手提应用的升压转换器. TPA2014D1能向8欧姆负载提供高达1.5W的功率,THD+N为10%,可广泛应用于无线手提设备,个人导航设备,手提游戏机和无线扬声器.本文介绍了TPA2014D1的主要特性,方框图以及应用电路.
Texas Instruments Incorporated (TI) (NYSE:TXN) today introduced a monolithic, filter-free Class-D audio amplifier with an integrated boost converter for portable applications including wireless handsets, personal navigation devices, portable gaming and wireless speakers. Addressing the need for louder volume and higher output power from the speakers, the TPA2014D1 provides up to 1.5 W across an 8-Ohm load, ensuring that volume is maintained even when the battery discharges to its minimum voltage.
The TPA2014D1 is a high efficiency Class-D audio power amplifier with an integrated boost converter. It drives up to 1.5 W (10% THD+N) into a 8 Ω speaker from a 3.6 V supply. With 85% typical efficiency, the TPA2014D1 helps extend battery life when playing audio.
The built-in boost converter generates a higher voltage rail for the Class-D amplifier. This provides a louder audio output than a stand-alone amplifier connected directly to the battery. It also maintains a consistent loudness, regardless of battery voltage. Additionally, the boost converter can be used to supply external devices.
The TPA2014D1 has an integrated low pass filter to improve RF rejection and reduce out-of-band noise, increasing the signal to noise ratio (SNR). A built-in PLL synchronizes the boost converter and Class-D switching frequencies, thus eliminating beat frequencies and improving audio quality. All outputs are fully protected against shorts to ground, power supply, and output-to-output shorts.
主要特性:
High Efficiency Integrated Boost Converter (Over 90% Efficiency)
1.5-W into an 8-Ω Load from a 3.6-V Supply
Operates from 2.5 V to 5.5 V
Efficient Class-D Prolongs Battery Life
Independent Shutdown for Boost Converter and Class-D Amplifier
Differential Inputs Reduce RF Common Noise
Built-in INPUT Low Pass Filter Decreases RF and Out of Band Noise Sensitivity
Synchronized Boost and Class-D Eliminates Beat Frequencies
Thermal and Short-Circuit Protection
Available in 16-ball WCSP and 20-Lead QFN Packages
3 Selectable Gain Settings of 2 V/V, 6 V/V, and
10 V/V
APPLICATIONS
Cell Phones
PDA
GPS
Portable Electronics
图1. TPA2014D1方框图
图2. TPA2014D1应用电路图
详情请见:
http://focus.ti.com/lit/ds/symlink/tpa2014d1.pdf
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