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SST-PB3-SLC PROSOFT類功放運用
並聯運用是AB類功放的運用之一，如圖1所示。IC並聯時可行進輸出電流，增加帶載才幹，可以帶更低阻抗的喇叭負載。為了避免兩個放大器輸出電流不一致，在輸出端分別串聯一個小電阻，作為均壓和均流。橋接辦法運用在相同的電源電壓下，橋接的輸出壓增加了一倍，輸出功率是單端辦法的4倍。圖2為LM3886橋接運用電路。
圖1 SST-PB3-SLC PROSOFT類功放並聯運用
圖2 SST-PB3-SLC PROSOFT類功放LM3886橋接運用
安穩性
規劃運用的安穩性很重要，規劃的不完善簡略引起振動。振動發生的原因許多。常見的一種振動之一是波形的負半周有毛刺發生“(fuzz)”。振動不只出現在負半周，正弦波上的每個點都有可能發生。
關於顫動的解決方案一般有三種，第一是參加緩衝器的辦法，在輸出端參加RC消振電路(也叫茹貝爾(zobel)移相網絡;第二是放大器增益辦法，大多數的AB類功放要求閉環增益大於10倍，在反應電路中參加反應電容，增加電路的安穩;第三是改進電源，在挨近器件的方位設備高頻濾波電容。
散熱要素
悉數的IC產品都存在熱損耗，AB類功放在運行時會有較大的熱量發生。不同的功耗取決於電源電壓和輸出負載(8Ω或4Ω)。
散熱效果取決於IC本身封裝的熱阻。θja 指的是“結與環境的熱阻”，θjc 指的是“結與外殼的熱阻”。散熱片也是以℃/W為單位的熱阻，θCS指的是“外殼與散熱片的熱阻”，θSA指的是“散熱片與環境的熱阻”。
PDMax = V2/(2×2RLoad)+PQ
其間，V為電源電壓，PQ為靜態功耗。
LM1875的PDMAX值
PDMAX=(50×50)/(2×(3.14)2×8)+(50V×70mA)
PDMAX=15.35+3.5=18.85W
大多數IC的數據手冊都有相應的“功耗”曲線，這是找出PDMAX值簡略的辦法。不是悉數作業條件下的功耗都能從曲線圖找到，需求確保喇叭負載與所選的“功耗”曲線圖相對應，如圖3所示。
用誠信的心，真誠的為您服務！
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