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(5)UC3843内部电路框如图3所示,其引脚功能见表2所示。(6)UC3843芯片是UC384X系列(如UC3842、UC3845等)中的一种。它们之间的不同点有三:第一是集成电路的启动电压(⑦脚)和启动后的最低工作电压(即欠压保护动作电压)不同;第二是输出驱动脉冲占空比不同;第三是允许工作环境温度不同。另外,集成电路型号末尾字母不同表示封装形式不同。主要不同点如表3所示。
(5) UC3843 internal circuit box shown in Figure 3, the pin function shown in Table 2. (6) UC3843 chip is UC384X series (such as UC3842, UC3845, etc.) in one. There are three differences between them: the first is the integrated circuit startup voltage (⑦ pin) and start after the minimum operating voltage (ie, under-voltage protection action voltage) is different; the second is the output drive pulse duty cycle is different; the third Is to allow the working environment temperature is different. In addition, the letters at the end of the integrated circuit model that the package in different forms. The main differences are shown in Table 3.