true the actual converter circuitry (inductor, mosfets etc) are on the back, like you said. smy has the MCU, gate driver, LDO's and other heat generating components completely covered by the foam tape. if i can i will update this post with a pic of the front side of the board.
right now, device mon is saying room temp is 76°. it's close, it's actually about 73-74°.
here is a Yun RDA with dual staple staggered fused clapton (those geek vape premade ones) 1 puff at 75w .098 ohms. towards the end of the vape (board temp 192°F) the too hot error popped up. you can tell when i let go of the fire button, the temp starts to drop.
View attachment 579465 i don't use this build on any of my dna 75's. i'm just using it to show you guys. this build stays on top of my relo with a heat sink 510 adapter. running at 190w.