文件名称：tl431基准电源制作
文件大小：939KB
文件格式：PDF
更新时间：2018-07-02 03:40:53
tl431
The technicall literature on loop control abounds with design examples of compensators implementing an operational amplifier (op amp). If the op amp certainly represents a possible way to generate an error signal, the industry choice for this function has been different for many years: almost all consumer power supplies involve a TL431 placed on the isolated secondary side to feed the error back to the primary side via an opto coupler. Despite its similarities with its op amp cousin, the design of a compensator around a TL431 requires a good understanding of the device operation. This first part explores the internal structure of the device and details how its biasing conditions can degrade the performance of the loop.