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
