原标题：TI TPA2028D1 3W 无滤波器D类音频放大方案

　　TI 公司的TPA2028D1是单声道 3W 无滤波器D类音频功率放大器,集成了音量控制,动态范围压缩(DRC)和自动增益控制(AGC).DRV/AGC功能可通过数字I2C接口进行编程.5V电源时能向4欧姆负载提供3W功率(THD+N为10%),工作电压从2.5 V 到5.5 V,工作电流1.8mA,关断电流0.2uA,主要用在无线或蜂窝手机与PDA,PND,DVD播放器,笔记本电脑,手提无线电和游戏机以及教育类玩具.本文介绍TPA2028D1主要特性,功能方框图, 指标测试方框图,以及TPA2028D1YZFEVM评估板性能,电路图和材料清单(BOM).

　　The TPA2028D1 is a mono, filter-free Class-D audio power amplifier with volume control, dynamic range compression (DRC) and automatic gain control (AGC). It is available in a 1,63 mm x 1,63 mm wafer chip-scale package (WCSP).

　　The DRC/AGC function in the TPA2028D1 is programmable via a digital I2C interface. The DRC/AGC function can be configured to automatically prevent distortion of the audio signal and enhance quiet passages that are normally not heard. The DRC/AGC can also be configured to protect the speaker from damage at high power levels and compress the dynamic range of music to fit within the dynamic range of the speaker. The gain can be selected from –28 dB to +30 dB in 1-dB steps.

　　TPA2028D1主要特性:

　　Fast AGC Start-up Time: 5 ms

　　Pin-out Compatible with TPA2018D1

　　Filter-Free Class-D Architecture

　　3 W Into 4

at 5 V (10% THD+N)

　　880 mW Into 8

at 3.6 V (10% THD+N)

　　Power Supply Range: 2.5 V to 5.5 V

　　Flexible Operation With/Without I2C

　　Programmable DRC/AGC Parameters

　　Digital I2C Volume Control

　　Selectable Gain from –28 dB to 30 dB in 1-dB Steps (when compression is used)

　　Selectable Attack, Release and Hold Times

　　4 Selectable Compression Ratios

　　Low Supply Current: 1.8 mA

　　Low Shutdown Current: 0.2 µA

　　High PSRR: 80 dB

　　AGC Enable/Disable Function

　　Limiter Enable/Disable Function

　　Short-Circuit and Thermal Protection

　　Space-Saving Package

　　1,63 mm × 1,63 mm Nano-Free WCSP (YZF)

　　TPA2028D1应用:

　　• Wireless or Cellular Handsets and PDAs

　　• Portable Navigation Devices

　　• Portable DVD Player

　　• Notebook PCs

　　• Portable Radio

　　• Portable Games

　　• Educational Toys

　　• USB Speakers

　　图1.TPA2028D1功能方框图

　　图2.TPA2028D1指标测试方框图

　　图3.TPA2028D1简化应用方框图

　　TPA2028D1YZFEVM评估板

　　The TPA2028D1 evaluation module (EVM) is a complete, stand-alone audio board. It contains the TPA2028D1 WCSP (YZF) Class-D audio power amplifier.

　　TPA2028D1YZFEVM评估板指标:

　　图4.TPA2028D1YZFEVM评估板外形图

　　图5.TPA2028D1YZFEVM评估板电路图(1)

　　图6.TPA2028D1YZFEVM评估板电路图(2)

　　TPA2028D1YZFEVM评估板材料清单(BOM):