Electronics > Projects, Designs, and Technical Stuff
Interesting failure of buck converter
Ice-Tea:
I agree that that ain't much of a margin...
MPS has some:
Digi Link
Neomys Sapiens:
What did you mean by 'prototype board'? Is it a demo board for the regulator or some other prototype where it does supply something? When you compare the actual layout with their recommendation regarding heat removal, how far apart is it? I have made the experience that higher power SMD parts can't be used if not provided with the correct thermal vias etc. So if that heat is coming from the regulator, which you say is running correctly, it has to go somewhere else instead of towards that diode.
mikeselectricstuff:
--- Quote from: Neomys Sapiens on May 30, 2019, 01:24:57 am ---What did you mean by 'prototype board'?
--- End quote ---
It's the pre-production protoype PCB, so as good a thermal layout as possible with the mechanical constraints I have.
ogden:
--- Quote from: mikeselectricstuff on May 29, 2019, 09:10:47 am ---Unfortunately there aren't many small 48V converters like this at sensible prices
--- End quote ---
You get what you pay for ;) I agree that 50V is way too slim margin for 48V supply, especially when transients can be there. Better add some 1$ to BOM for better regulator and sleep well ;) In your case I would use http://www.ti.com/product/LMR16030
mikeselectricstuff:
--- Quote from: ogden on May 30, 2019, 09:43:46 am ---
--- Quote from: mikeselectricstuff on May 29, 2019, 09:10:47 am ---Unfortunately there aren't many small 48V converters like this at sensible prices
--- End quote ---
You get what you pay for ;) I agree that 50V is way too slim margin for 48V supply, especially when transients can be there. Better add some 1$ to BOM for better regulator and sleep well ;) In your case I would use http://www.ti.com/product/LMR16030
--- End quote ---
Efficiency of the TI part looks way lower - about 82% vs. 91% for the ST, based on nearest graphs in the datasheet - ST has a sync. rectifier fet across the diode.
For this application I'm very constrained for space to get rid of heat.
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