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LM5022: LM5022 Voltage Dropping on Load

Part Number: LM5022
Other Parts Discussed in Thread: OPA2992, OPA455

Tool/software:

Good day,

I have built a 20VDC - 40VDC converter following the design guidelines from the datasheet. It is producing 40V as expected with no load.

However, its voltage drops from 40V-30V as I connect a load (OPA2992) circuit. 

I would like some advice on the causes of the voltage drop, as well as possible solutions to combat the problem.

(a) when no load

(b) when loaded

16-40-OPA455.TSC

This is not happening on this circuit alone, but on other multiple circuits.