ST 公司的TS4982是集成了參考地耳機驅動器的2W立體聲音頻功率放大器.單電源5V工作,每路能向4歐姆負載輸出2W,此時的THD+N為1%, 耳機驅動器能向16歐姆負載輸出125mW.主要應用在筆記本電腦和手提音頻設備.本文介紹TS4982主要特性, 方框圖, 典型應用電路圖和外接元件表,以及演示板STEVAL-CCA019V1主要特性和電路圖.
TS4982: 2 W stereo audio power amplifier with ground-referenced headphone driver The TS4982 features a stereo loudspeaker driver and a ground-referenced stereo headphone driver. An independent standby mode pin allows the TS4982 to simultaneously drive both output drivers. Operating on a single 5 V supply, the TS4982 delivers 2 W (typ.) output power into a 4 ohm load at 1% THD+N.
The TS4982 features a PC beep input, three levels of 3D stereo enhancement and 4-step gain control using two digital input pins. Minimum external components make the TS4982 wellsuited for notebook and other hand-held sound equipment. It also has an internal thermal shutdown (150℃) and output short circuit protection mechanism.
TS4982主要特性:
■ 2 W output power into 4 ohm load per channel
■ 125 mW into 16 0hm load ground-referenced stereo headphone driver
■ Four-step gain settings on speaker path
■ 3 levels of 3D effect on speaker path
■ PC-beep input system detection
■±8 kV HBM ESD-protected headphone outputs
■ Pop and click reduction circuitry
■ 32-pin 5 x 5 mm QFN package
■ Thermal shutdown and output short-circuit protection(a)
TS4982應用:
■ Laptop/notebook computers
■ Portable audio devices
圖1.TS4982方框圖
圖2.TS4982典型應用電路圖
應用電路圖外接元件表:
演示板STEVAL-CCA019V1
2 W stereo audio power amplifier based on the TS4982
The STEVAL-CCA019V1 is a demonstration board designed to help in the characterization of the TS4982, which features a stereo loudspeaker driver and a ground-referenced stereo headphones driver. An independent standby mode pin allows the TS4982 to simultaneously drive both output drivers.
Operating on a single 5 V supply, the TS4982 delivers 2 W (typ.) output power into a 4 ohm load at 1% THD+N.
The TS4982 features a PC beep input, three levels of 3D stereo enhancement and 4-step gain control using two digital input pins.
A minimum number of external components makes the TS4982 well suited for notebook and other hand-held sound equipment. It also has an internal thermal shutdown (150℃) and output short-circuit protection mechanism. The TS2012 is available in a 4x4 mm QFN20 package.
演示板STEVAL-CCA019V1主要特性:
■ 2 W output power into 4 ohm load per channel
■ 125 mW into 16 0hm load ground-referenced stereo headphone driver
■ Four-step gain settings on speaker path
■ 3 levels of 3D effect on speaker path
■ PC-beep input system detection
■ ±8 kV HBM ESD-protected headphone outputs
■ Pop and click reduction circuitry
■ 32-pin 5 x 5 mm QFN package
■ Thermal shutdown and output short-circuit protection
RoHS compliant
圖3.演示板STEVAL-CCA019V1外形圖
圖4.演示板STEVAL-CCA019V1電路圖
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