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Hi
芯片本身包含的电流保护脚- ILIM/SD （a current limit comparator with a 1V threshold）
在datasheet： http://www.ti.com.cn/cn/lit/ds/symlink/uc3825.pdf 第八页的Design Example可以看到，芯片是通过探测变压器初级的sense电阻上的电压来做电流保护的。
