基于TPA2028D1设计的3W无滤波器D类音频放大技术

作者：时间：2010-06-06来源：网络收藏

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 C28 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 C28 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: 0.2µA

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