431本身只是个稳压管，是个可以调节电压值的稳压管，所以不可以直接做输出的，一般应用都要接上三极管做扩流的。就像稳压二极管一样，所以楼主要改变输出电流也只能在431的电流极限内的1/10内改变，再大了，估计都没有什么效果了，输出阻抗本身就会影响输出电压的，强行减小输入电阻（其实是叫限流电阻）来实现增大输出电流是不可取的，会烧了431的。而且稳压作用也就不存在了。-431 itself is just a voltage regulator tube is a voltage regulator can be adjusted, so can not be done directly output, the application must be connected to the transistor to do the expansion flow. Zener diode, so the main floor, change the output current can only change within the current limit of 431 1/10, and then a big, is estimated to have much effect, the output impedance will affect the output voltage, forced to reduce the input resistance (in fact, called the current limiting resistor) to increase the output current is not desirable, and will burn 431. And the regulator role does not exist.