I looked at the drawings and recommendations of the STDN-3A24 module and noticed that the value of several components changes depending on the output voltage. The first thing to notice is that the value recommended for the 5V 3A output in the photo is not the same as the value of the inductance. According to the label, the built-in inductance is 100.
According to the recommendation, 5.5uH I saw a value of 4R7 elsewhere. These are the recommendations of the MP2315.
Could that be why its heat production is higher?
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Gyula HA3HZ
HA3HZ