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A monolithic power op amp

机译:单片功率运算放大器

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摘要

The standard junction-isolated power process has been modified by the addition of polycrystalline-film resistors to solve the topological problems encountered in making 90-W, 80-V, 10-A power transistors and connecting them together for a push-pull output. An all n-p-n output stage that holds crossover distortion to 0.01% while driving a 4- Omega load, even with the quiescent current below 20 mA, has been developed. It is stable with all reactive loads and does not have the spurious-oscillation problems observed with the familiar quasicomplementary amplifier. These innovations are described along with the design of a complete power op amp, the LM12. The prevention of failures from substrate currents which occur when the output is driven outside the supply by inductive loads is discussed.
机译:通过添加多晶膜电阻器,对标准结隔离功率工艺进行了修改,以解决制造90W,80V,10A功率晶体管并将它们连接在一起以提供推挽输出时遇到的拓扑问题。开发了一种全n-p-n输出级,即使静态电流低于20 mA,也能在驱动4-Ω负载时将交叉失真保持在0.01%。它在所有电抗性负载下都稳定,并且不存在使用熟悉的准互补放大器观察到的杂散振荡问题。这些创新与完整的功率运算放大器LM12的设计一起进行了描述。讨论了防止衬底电流发生故障的情况,这种情况是在电感负载将输出驱动到电源之外时发生的。

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