主要是关于LM317的说明文档 里面包含LM317的各种电气特性的要点，有关于LM317的应用电路，为电源可调稳压电路的设计提供了超好的参考资料，直接设计电路使用。(The main points of various electrical characteristics on the LM317 documentation, which contains the LM317 of the application circuit of LM317, provides a good reference for the design of super power adjustable voltage regulator circuit design circuit, direct use.)