Other Parts Discussed in Thread: TPS40428
Hello
is a design with the tsp40428 I gave an input voltage of 5.25 to the converter and the power stage vdd.
after start up the output voltage (0.85)fell and would not start again . It would reach the voltage and then fall.
After trying to find the source of the problem I noticed the input voltage rise a little bit after the startup( the startup current fell to normal load)
even though the input didn’t rise above 5.35 the part seemed to go into over voltage protection.
I suspect the problem is the power stage since the converter is good to 20v input .
When lowering the input voltage to 5.1 all works well …
is this a known problem ?
why did go into over voltage protection when the maxim working voltage is 5.5v