Hi Team,
a customer of mine is considering the LM5041 for a new design and has the following question:
I am currently looking at the LM5041 cascaded PWM controller for a current fed +/- 140V out 20 W power converter.
This uses a buck stage followed by a push-pull transformer stage, all controlled by the LM5041. I like the current fed
approach because it prevents the high current pulses associated with a voltage fed transformer, when generating
high voltage outputs. In the past I have had to use special low-capacitance output windings to prevent serious
transformer heating in a voltage fed approach, so I favor the current fed.
However, it seems like a cascaded boost stage followed by a push-pull transformer would reduce the required turns
ratio needed, by making the center tap voltage of the transformer higher. I seem to recall that T.I. once made such a
controller at one point in time. Does T.I. make anything that does this or are there problems associated with the boost
approach?
Regards
Mihir
