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Part Number: LM5160A
Other Parts Discussed in Thread: LM5160

Tool/software: WEBENCH® Design Tools

I have a problem with the design I did in the WEBENCH for the component LM5160 .
I use the LM5460 component as an isolated DC/DC to convert from 28v to 5v isolated with an output current of up to 1.5A.
The following is the design result I received from the WEBENCH:

The problem is that during the POD to the board with the dc/dc design according to the WEBENCH, as soon as I connect a load that draws a current of 300mA, there is a voltage drop from 5v to 4.5v.

the design is for 1.5A current consumption, what the problem?