The reason I've used TL494 is because I can play with the error amplifiers. And it's got two.
I might sound stupid, but the threshold voltage for the UC3845's current sense input is 1.1V (say 1V to simplify everything). So that means 10A through a 0.1 ohm resistor. But what if I want to limit the current to 5A through the same resistor? That would be 0.5V. How do you "lower" the threshold so it would start limiting at that value? A comparator can be used, but it 1V is too low for a supply voltage.
Apart from that, I thought about what Silvio said and I had the idea of building a single rail 50V supply and then adding another push-pull stage with a 1:1:1 transformer that outputs +50V and -50V. All the regulation made at the "primary" of this transformer will reflect at both of the secondaries, and being 1:1 makes everything easier. Of course, that means double the losses and half the power.
I've also looked at UC3845/UC3843 and SG3525 (for push-pull mode). I'm not sure if 2-switch forward can be run on duty cycle greater than 50%.