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TPS5430做负压输出时电压不稳

Other Parts Discussed in Thread: TPS5430

搭一个运放电路,需要正负15V供电,现在想用DCDC正压输入负压输出产生-18V电压,再用7815产生-15V,参考TPS5430负压电路调试时发现, 不接负载时,电压-18V正常,但是一接负载(20mA以内),输出电压就变成-3V左右,测试占空比没有变化,只是振荡幅值变得很小,不知是哪里原因,电感用10uH、22uH都不行。