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LMZM33604: LMZM33604输出负电源相关问题

Part Number: LMZM33604

需求:

  24V输入,-15V/2A输出。

  原理图如下(DNP表示器件未安装)

调试结果:

  空载时-15V输出正常。但接负载后,输出负压变低。-17V@0.25A,-20V@0.5A。

想请教一下是什么原因及如何修改。