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Unstable output on LM25018 circuit

Other Parts Discussed in Thread: LM25018

Dear sir/madam,

         I designed a 24V-5V isolated power with LM25018, but its output will drop by 1.2V when 200mA load is connected to output. The output voltage is  5.9V when output is float, but it will drop to 4.7V when 200mA load is connected. However  Primary Output Voltage is stable about 5.1V regardless of load.

The sch graph is as follows.

I'm looking forward to your reply as soon as possible.

Regards,

Qian.Miao