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？
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