我想输入32v，输出12v带车载，通电用表测电压调到12.5v正常，但一上负载马上降到4.5v，小白不知怎么弄，
#(pic,40307953707,900,506)
#(pic,40307953764,900,506)
#(pic,40307930989,900,506)
#(pic,40307953848,900,506)
#(pic,40307931119,900,506)
#(pic,40307953953,900,506)
#(pic,40307931212,900,506)
#(pic,40307954035,506,900)
#(pic,40307953707,900,506)
#(pic,40307953764,900,506)
#(pic,40307930989,900,506)
#(pic,40307953848,900,506)
#(pic,40307931119,900,506)
#(pic,40307953953,900,506)
#(pic,40307931212,900,506)
#(pic,40307954035,506,900)
