单元测试强调内部结构，例如逻辑和数据流，以及单元的功能和外部可见行为测试。
Unit testing addresses the internal structure, such as logic and dataflow, and the testing of functions and the externally visible behavior of the unit.
在大部分情况下，实现者可以是内部网或 Internet 上某处的远程功能单元的提供者。
The implementer may, in most cases, be a provider of a remote unit of functionality, somewhere in the internal network or Internet.
文中介绍了L6598内部结构、引脚功能、单元电路工作原理及其在宽范围AC/DC适配器中的应用电路。
The article presents L6598 inner structure, its lead functions, unit circuit operation philosophy and its circuit in the wide range AC/DC adapter.
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