for last one month i am working on a power circuit, the constraints are input - 24v to 100v and output-fix 12V/1.5A max. The problem is i need to design a voltage regulator circuit. We don't have the much size on pcb for make buck converter and we need to minimize the cost. I looked a voltage regulator IC name LR__ but the current rating of that ic is very low. And if i use LM317HV then i am not sure about circuit and its input range. Please help me to design a voltage regulator which input is 24v to 100v and output is 12v/1.5amp max. Is any regulator ic available in this range ?