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tps54540



输入28v ,设计输出12v 3.5a,空载的时候启动正常 ,达到12v ,当我接上12w的2个小风扇的时候,输出只有8v左右,测量一下FB只有400mv左右,如果此时拔了小风扇,输出又正常了即达到12v