NXP 公司的SA58672是單聲道 3W D類(lèi)無(wú)濾波器的音頻功率放大器,具有關(guān)斷控制,高的PSRR和差分電路拓撲,從而提高了噪音和RF的免疫功能,快速起動(dòng)和小型WLCSP封裝,使它非常適合用在手機和PDA等手提設備.本文介紹了SA58672的主要特性,方框圖以及評估板電路圖和SA58672測試方框圖。

　　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應用 :

　　Wireless and cellular handsets and PDAs

　　Portable DVD player

　　USB speakers

　　Notebook PC

　　Portable radio and gaming

　　Educational toys

　　圖1.SA58672方框圖

　　圖2.SA58672評估板電路圖

　　圖3.SA58672測試方框圖