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TPS40200: 输出不稳压

Part Number: TPS40200

器件回路都连接正常,需要输入12v输出8V,使用的就是手册提供的原理图,测量结果:在输入电压为12v时,FB引脚电压1.2V,COMP端电压为8v.将电压降低到5V,它在5-6V范围之内又可以稳压。但6V以上输出引脚就为高电平了,输出就不稳压了。