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.

TL431 文档.docx

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