Hey guys,

I was trying to design a non-inverting buck-boost converter to convert vmin 20v & vmax 30v to vout1 28v and vout2 50v. So basically i need two output voltages of 28v and 50v from this range of input. While i was looking online for any ic's to help out with this I couldn't find any. I need some help regarding making a circuit like this without a micro controller.

Thanks a lot

 

I'm not educated enough to tell you how to do it in one converter, but I can point you to who can do it with 2 converters.
http://www.ti.com/ww/en/simple_switcher/index.html

 

Hey guys,

I was trying to design a non-inverting buck-boost converter to convert vmin 20v & vmax 30v to vout1 28v and vout2 50v. So basically i need two output voltages of 28v and 50v from this range of input. While i was looking online for any ic's to help out with this I couldn't find any. I need some help regarding making a circuit like this without a micro controller.

Thanks a lot

Have a look at Web Bench from TI.
http://www.ti.com/lsds/ti/analog/webench/power.page
I plugged in your numbers with 1/2 amp output and came up with a 2 chip solution:
LM3488 and LM25118.

 

Hey guys,

I was trying to design a non-inverting buck-boost converter to convert vmin 20v & vmax 30v to vout1 28v and vout2 50v. So basically i need two output voltages of 28v and 50v from this range of input. While i was looking online for any ic's to help out with this I couldn't find any. I need some help regarding making a circuit like this without a micro controller.

Thanks a lot

Making an SMPS is not as simple as choosing a chip. What is difficult is selecting the right magnetics, the right capacitors, and understanding that PCB layout will likely make or break your design. You've given us the voltages, but you need more. You need to start with the required power output and an expectation for the efficiency you require.