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浅析U盘的重要组成部件

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　　对于U盘，现在可是说是几乎人手一个了，U盘的广泛使用，给人们的生活、工作、学习都带来了很多便捷的地方。小小的U盘，有着大大的功能，但是大家对于U盘的组成结构了解多少呢？U盘又是有哪些重要部件构成的呢？

　　浅析U盘的重要组成部件：

　　U盘的组成结构比较简单，主要是由USB插头、晶振、主控芯片、稳压IC（LDO）、PCB板、帖片电阻、电容、闪存（FLASH）、发光二极管（LED）等组成。还有些U盘会在USB+5V和稳压IC之间串一个0欧姆的维护电阻，此刻稳压IC没有5V输入电压就是它坏了。如今许多主控都将LDO集成到主控内部了，所以会看到许多U盘都没有外置LDO了，它们都是USB+5V电压直接输入。这种状况就要换主控了。

　　稳压IC

　　稳压IC又称LDO，其输入端5V，输出3V，有些劣质的U盘的稳压IC很小，很容易过热而烧毁。还有USB电源接反也会造成稳压IC烧毁。维修时可以用万用表测量其输入电压和输出电压。如无3V输出，那就可能是稳压IC坏了。但有一种情况，输出电压偏低，且主控发烫，这时就是主控烧了

　　FLASH焊盘

　　FLASH焊盘它的作用是固定闪存，使闪存与主控衔接。受外力揉捏后简单使闪存与焊盘接触不良，这时会形成电脑上的U盘打不开，无法存储文件等。只要将闪存的引脚补焊一下就可以修正，也即咱们常说的拖焊。

　　USB插头

　　USB插头比较容易出现问题和电路板脱焊，造成U盘无法被电脑识别，如果是电源脚虚焊，会使U盘插上电脑无任何反映。有时将U盘摇动一下电脑上又可以识别，就可以判断USB插口接触不良。只要将其补焊即可解决问题。

　　主控芯片

　　主控芯片主操控芯片担任闪存与USB衔接，是U盘的中心，咱们通常所说的U盘计划就是指主控芯片的类型。量产东西也是与它对应的。有些主控芯片还要输入3V的电压给FLASH供电，确保闪存的正常作业。

　　晶振

　　晶振早期的时候U盘大多都是用6M的晶振，现在的U盘普遍采用12M晶振。晶振不耐摔，所以它是U盘上的易损件，最好的维修方法就是用相同频率的晶振直接代换。

　　一个小小的U盘竟然有这么强大的功能，有这么大的存储容量，有这么快的读取速度，其实这些都要归功于U盘的各个构成部件，有了它们的支持，才能促成这么一个好用又便捷的U盘。

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