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OPA549的热保护功能是不是在电流超过限流值，以及芯片过热都会开启？
OPA549的结温保护。也就是管芯温度保护。
所以；如果结温升速度快，壳温还没起来；结温就可能OVER了。
但过流并不一定启动过热保护。
