L
legg
Hello experts
Still rather new to the world of SEPIC, I have a problem with a design.
I have made a circuit based on the datasheet for the LM3478. It is intended
to run with Vin from 10V to 32V and deliver 24V out with a maximum of 4Amps.
My testsetup runs at 32V input. The circuit is as can be seen here:
www.impc.dk/scm/lm3478sepic.pdf
A colleague of mine recently built something quite similar but with the
LTC1871 controller instead. But I'd rather use the national part, since we
already has this part in stock.
When I run with no load, output is 24V and everything is nice. But when I
load the darn thing, even only by one amp, everything gets so hot and
eventually the sense resistors crack.
You posted a similar thermal problem with the same IC and a similar
power train in Sept of last year.
How was that resolved?
RL