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TL431: 关于TL41的REF引脚的最大耐受电流10mA是如何定义的

Part Number: TL431

关于TL41的REF引脚的最大耐受电流10mA是如何定义的,REF引脚不是接到内部放大器的输入,是虚断的,这个10mA电流是怎么灌进去的呢?是设计保证吗?实际不会测到?