功率放大器 doc.doc

编号:
电子线路设计
实训(论文)说明书
题目: 功率放大器
院(系): 应用科技学院
专业: 电子信息工程
学生姓名:
学号:
指导教师:
2009年 7 月 8 日
摘要
功放在现实生活中很常见,几乎是有音乐的地方都会看到功放的身影,功放俗称“扩音机”他的作用就是把来自音源或前级放大器的弱信号放大,推动音箱放声。一套良好的音响系统功放的作用功不可没。由于考虑功率、阻抗、失真、动态以及不同的使用范围和控制调节功能,不同的功放在内部的信号处理、线路设计和生产工艺上也各不相同。功放有很多种,可以是用分立原件做的,也可以是用集成块来做的。一般用分立原件做的比较难匹配,所以难度比较大,但是分立原件可以把放大倍数做得大一些。用集成块做功放的优势也很明显,除了好匹配外它还以电路简单的特点,所以适合初学者。现在市场上有很多种功放集成块,比如LM1875,TDA2030。
本作品是用TDA2030制作。TDA2030是ETC的一款20W中功率高保真功率放大集成电路,年代已相当久远,但至今还有不少厂家出的电脑有源音箱中采用此IC,爱好者对此IC也是极有追捧。这足以证明TDA2030的性价比是相当好。TDA2030 集成电路的第三个特点是外围电路简单,使用方便。在现有的各种功率集成电路中,它的管脚属于最少的一类,总共才5端,外型如同塑封大功率管,这就给使用带来不少方便。
T2030被广泛应用也比LM1875早也比较廉价,功放效果也很好,噪声小。TDA2030单级放大一般是33倍左右,如果放大倍数没有达到要求,可以加前置放大,这样可以大大提高放大倍数。
关键词:TDA2030;功放;集成块
Abstract
The power amplifier is mon in the real life, nearly there is a music place, there is a power amplifier. The power amplifier called "loud-speaker", its function is making magnify of the sound source, and maked the sound box sounded.
It has a very improtant effect of a good Sound Installation .Cause of power, mpedance, distortion, developments and different range of application, control, adjust, it's different of signal processing, wire design and production engineering of different power amplifier. The power amplifier has many kinds, it can be done by establishes separately element part, and also can be done by integrated package. Generally with establishes separately element part to do quite difficultly to match, sothe difficulty is big, but establishes separately element part is possible to do the enlargement factor more big. Makes the power amplifier superiority with the integrated block to be very also obvious, besides good match it also good by simple electrocircuit characteristic, therefore suits the beginner. Now in the market have very many kinds of integrated package of power amplifier, for instance LM1875, TDA2030.
The production is maked of TDA2030. TDA2030 was in ETC section of 20W the power high fidelity power amplification integrated cir