Is there any Flyback solution applicable for negative input? The negative input will up to -72Vdc.
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Since a flyback supply uses a transformer, there is no reason it can't work from a negative input rail as long as the controller GND is the most negative potential and the absolute maximum ratings of the controller are not violated. Unfortunately in webench or with our models, this may not simulate well as the models assume the lowest potential is GND. It might be best to get an EVM to try it out.