NXP SA58672 3W D类音频功率放大方案

NXP 公司的SA58672是单声道 3W D类无滤波器的音频功率放大器,具有关断控制,高的PSRR和差分电路拓扑,从而提高了噪音和RF的免疫功能,快速起动和小型WLCSP封装,使它非常适合用在手机和PDA等手提设备.本文介绍了SA58672的主要特性,方框图以及评估板电路图和SA58672测试方框图.

SA58672: 3.0 W mono class-D audio amplifier

The SA58672 is a mono, filter-free class-D audio amplifier which is available in a 9 bump WLCSP (Wafer Level Chip-Size Package) and 10-terminal HVSON packages.

The SA58672 features shutdown control. Improved immunity to noise and RF rectification is increased by high PSRR and differential circuit topology. Fast start-up time and very small WLCSP package makes it an ideal choice for both cellular handsets and PDAs.

The SA58672 delivers 1.7 W at 5 V and 800 mW at 3.6 V into 8 ohm. It delivers 3.0 W at 5 V and 1.6 W at 3.6 V into 4 ohm . The maximum power efficiency is excellent at 90 % into 8 ohm and 84% to 88% into 4 ohm . The SA58672 provides thermal and short-circuit shutdown protection.

SA58672主要特性:

Output power

3.0 W into 4 ohm at 5 V

1.6 W into 4 ohm at 3.6 V

1.7 W into 8 ohm at 5 V

800 mW into 8 ohm at 3.6 V

Power supply range: 2.0 V to 5.5 V

Shutdown control

High SVRR:77 dB at 217 Hz

Fast start-up time: 7.0 ms

Low supply current

Low shutdown current

Short-circuit and thermal protection

Space savings with 1.66 mmx1.71 mmx0.6 mm 9 bump WLCSP package

Low junction to ambient thermal resistance of 100 K/W with adequate heat sinking of WLCSP

Enhanced power dissipation with 3.0 mmx3.0 mmx0.85 mm HVSON10 package

SA58672应用 :

Wireless and cellular handsets and PDAs

Portable DVD player

USB speakers

Notebook PC

Portable radio and gaming

Educational toys



图1.SA58672方框图



图2.SA58672评估板电路图



图3.SA58672测试方框图