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LM27762输出急剧跌落

Other Parts Discussed in Thread: OPA2727, LM27762, LM358

LM27762做电源,输入+5V,输出正负3.3V,供3个OPA2727使用,不焊接OPA2727输出正常,分别为+3.317V,-3.401V,焊接一个OPA2727,正电压变为+3.203V,负电压变为-0.685V。更换电源,由USB改为电流源供电,电流40mA。翘起OPA2727管脚4(-3v3管脚),则输出电压恢复正常。FB-电压为0.4V。为什么输出电压会跌落这么大幅度?且测量输出电压波形,三角波频率为20多KHZ,此时不应该是2MHz吗?