SST-PB3-VME-2 PROSOFT 价格好

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SST-PB3-VME-2 PROSOFT类功放运用

并联运用是AB类功放的运用之一，如图1所示。IC并联时可行进输出电流，增加带载才干，可以带更低阻抗的喇叭负载。为了避免两个放大器输出电流不一致，在输出端分别串联一个小电阻，作为均压和均流。桥接办法运用在相同的电源电压下，桥接的输出压增加了一倍，输出功率是单端办法的4倍。图2为LM3886桥接运用电路。

图1 SST-PB3-VME-2 PROSOFT类功放并联运用

图2 SST-PB3-VME-2 PROSOFT类功放LM3886桥接运用

安稳性

规划运用的安稳性很重要，规划的不完善简略引起振动。振动发生的原因许多。常见的一种振动之一是波形的负半周有毛刺发生“(fuzz)”。振动不只出现在负半周，正弦波上的每个点都有可能发生。

关于颤动的解决方案一般有三种，第一是参加缓冲器的办法，在输出端参加RC消振电路(也叫茹贝尔(zobel)移相网络;第二是放大器增益办法，大多数的AB类功放要求闭环增益大于10倍，在反应电路中参加反应电容，增加电路的安稳;第三是改进电源，在挨近器件的方位设备高频滤波电容。

散热要素

悉数的IC产品都存在热损耗，AB类功放在运行时会有较大的热量发生。不同的功耗取决于电源电压和输出负载(8Ω或4Ω)。

散热效果取决于IC本身封装的热阻。θja 指的是“结与环境的热阻”，θjc 指的是“结与外壳的热阻”。散热片也是以℃/W为单位的热阻，θCS指的是“外壳与散热片的热阻”，θSA指的是“散热片与环境的热阻”。

PDMax = V2/(2×2RLoad)+PQ

其间，V为电源电压，PQ为静态功耗。

LM1875的PDMAX值

PDMAX=(50×50)/(2×(3.14)2×8)+(50V×70mA)

PDMAX=15.35+3.5=18.85W

大多数IC的数据手册都有相应的“功耗”曲线，这是找出PDMAX值简略的办法。不是悉数作业条件下的功耗都能从曲线图找到，需求确保喇叭负载与所选的“功耗”曲线图相对应，如图3所示。

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