常用D类功放IC

常用D类功放IC常用数字放大器用集成电路2007-07-27 10:28数字放大器(又称丁类放大器)是一种利用开关技术放大音频信号的音频功率放大器.这种放大器在二十世纪七十年代就已问世,但由于音质方面的原因,在当时并未形成气候.时隔二十多年后,随着电子技术和元器件制造工艺的进步,人们对环境保护意识的增强,数字放大器重新崛起.由于数字放大器的功率放大级工作于开关状态,放大器具有小型、轻量、能源利用效率高、输出功率大、发热量小等诸多优点,已成为音频功率放大器的主要发展趋势.为了迎合这一发展趋势世界上很多半导体生产厂家都开发出了专门用于数字放大器的不同用途的专用集成电路.其中包括只含丁类输出级的集成电路、模拟信号输入的PWM处理器(驱动集成电路)、数字信号输入的PWM处理器(驱动集成电路)以及将驱动电路和输出级全部集成于一块芯片的单片全集成电路,以满足构成各种不同用途的数字放大器时的需要.应用时应根据其用途选择不同的集成电路.
(1)制作耳机放大器
考虑到耳机所需的功率不大,所以电源电压不必用得过高,只需小于5V就可以了.为了减小放大器的体积,应选择全部电路都集成于一块芯片的单片全集成电路.例如选用新日本无线公司生产的NJU8721、NJU8725,TI公司的TPA2000D4等.
(2)制作驱动小型扬声器的功率放大器
这种场合可选用输出功率在1W~10W的单片全集成电路.这类集成电路有雅玛哈公司的YDA131-E,Tripath公司的TA2021、TI公司的TPA2000D2,ST微电子公司的TDA7480等.在这些放大器集成电路中,有的集成电路即使用4节5号电池给放大器供电,也能让扬声器在24小时内输出足够的音量.
(3)制作数字信号输入型的数字放大器
在此场合可将数字输入的PWM处理器和丁类输出级集成电路组合起来.也可以采用数字输入PWM处理器与栅极驱动器组合再加上大功率MOS-FET的组合方案.但是对后一种方案来说,必需使用理想的稳压电源.
        由于PWM信号的咏冲宽度的分辨力是有一定限度的,会随之发生量化噪声,所以必须使用三阶以上的高阶        型噪声整形等降低音频带域声的技术.
(4)制作模拟信号输入型的数字放大器
        此时应选用模拟输入PWM处理器,先将模拟信号变换成PWM的数字信号.然后再经丁类输出级或者栅极驱动器加上MOS-FET放大后输出.
由于通常都接有负反馈,对电源的要求不必太高.采用电源变压器的电容输入型整流电路的电源就足够了.
(5)输出功率大于100W
在此场合,丁类输出级集成电路已无法满足大功率输出的要求,得使用栅极驱动集成电路和MOS-FET的组合方式.此时选择MOS-FET非常关键.应尽量选用该栅极驱动集成电路数据表中所推荐使用的MOS-FET.最近,日本三洋电机开发出了专门用于功率级的混合集成电路STK210-030.


单片全集成电路
型号                      输出[W]                      电源电压        THD+N@1kHz [%]                  厂名
NJU8721        2×0.05@16                  3.3                            —                              新日本无线
NJU8725        2×0.08@8                      5                            —    
YDA131-E      2×1@4                          5                            0.018                            雅玛哈
TA2021          2×10@4                      13.5                        0.1    
TA2041          4×70@4                      20                          0.04                              Tripath
TA2022          2×90@4                      31                          0.1    
TPA2000D2    2×2@4                          5.5                        0.5                                    TI
TPA2000D4    2×2@4                          5.5                        0.4    
MP7720          1×20@4                        25                          0.07            Monolithic Power Systems(美国)
TDA7480        1×7@4                      ±10.5                        1    
TDA7481        1×13@4                      ±15                          1                                  微电子    
TDA7482        1×18@4                      ±21                          1    
TDA8920        2×65@4                      ±27                        0.5                                菲利浦    


数字输入PWM处理器(驱动器集成电路)
型号                    取样频率[kHz]          输出声道数          THD+N@1kHz [%]          厂名
TAS5001                32~96                        2                            0.08    
TAS5012                32~192                      2                            0.06                          TI
TAS5036A              32~192                      6                            0.06    
STA304A                32~96                        5                              —                        微电子
STA308                  32~192                      8                              —
M65817AFP            32~192                    2                              —              Renesas Technology
DDX2000                32~48                        2                              —                Apogee Technology
  

模拟输入PWM处理器(驱动器集成电路)
型号                丁类输出段形式          输出声道数          ????                    厂名
TC2000                  全桥                          2                        45                      Tripath
YDA135-VZ            全桥                          2                        20                        雅玛哈
TDA8929T              半桥                            2                        50                        菲利浦


栅极驱动器集成电路
型号                丁类输出段形式          输出声道数          工作电压[V]            厂名
HIP2100                    半桥                          2                        100                    Intersil
TK2150                    半桥                            2                        ±60                    Tripath
IR2010(S)                半桥                            1                        200                        IR
M61556FP              全桥                            2                        88            Renesas Technology
TAS5182                  全桥                            2                          ~                          TI


丁类输出级成电路
型号                  丁类输出段形式          输出声道数          输出功率[W]          厂名
STA505                  全桥                            2                        50 & 8                  ST 微电子
DDX-2100              全桥                            2                        50 & 8              Apogee Technology
TP2050                  全桥                            2                        50 & 8                    Tripath
TAS5100                全桥                            1                        30 & 6
TAS5110                全桥                            1                        50 & 4                        TI
TAS5101                半桥                            2                        15 & 4

STK210-030          半桥                            2                      100 & 8                  三洋电机
TDA8926TH            半桥                            2                        40 & 4                    菲利浦
TDA8927                半桥                            2                        65 & 4  
TDA8920BTH                                          2                        100w
TDA8920BTH                                          2                          50W
TDA8932T                                            2                          30W
TDF8591                                            2                          160W 负载2欧 专业做汽车音响
TDA8950BJ                                      2                            170W
TDA8950BTH                                  2                              170W
TFA9810TH                                      2                              10W
TFA9815TH                                      2                              15W
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