we have a heat problem with the LM3429 when running
it with Vin from 7.2 to 6V. With 12V it is ok. I understand that, judging from the data sheet that both
the 12V and the lower range is outside guaranteed specs. I must therefore try to establish the source
of this extra heat. Is it possible that the heat comes from the chip operating poutside of guaranteed
specs? In the datasheet it says that it can withstand the range 4.5 to 75V, BUT that recommended
range is at least 10V as Vin, not lower. How i that contradiction to be interpreted?
I highly appreciate a fast response since the LM3429 is located in a Product that is used
in security calssified Environments and we need to find the cause of the extra heat. We have
understood by using a simulation of the LT3477 that the internal resistance of the switch inductance
is one part of the problem since when operatin down to 6V you get high switch current.