In the event of an overload when ILOAD exceeds its maximumpermissible value, the increase in voltage across R6 results in sufficient base-emitter voltage to turn on Q2.
当iload超过最大允许值时发生过载情况,R6上的电压增大导致基极-发射极电压足够大到导通Q2。
2
When choosing a value for R6, ensure that Q2's base-emitter voltage is less than approximately 0.5V at the maximumpermissible value of the load current.