UCC38C43: Webench Designer Non Flyback Capability?

Fred,

Thanks for your interest here. You're absolutely right. It can be used for boost, forward, flyback, etc. But Webench is only enabled for flyback for that family. 

You have a few options to get started:

1) Powerstage designer: 

Because these are fixed frequency current mode devices you can use Powerstage designer to size the main powerstage components around the controller. Then you would follow the datasheet recommendations of the UCC38C43 to choose the R's and C's for the basic settings.

2) You can search for existing reference designs that meet your requirements here: 

3) you can provide me your design specs like VinMin, VinMax, Vout, Iout and I can search for you for reference designs on our internal TI database. We have ~30k internal reference designs so we most likely will have something close to your needs.

Please let me know if this helps and how you would like to move forward.

Regards,

John

The design specs are: Non isolated 18Vout, 10Vin min 14Vinmax, 12Vin nom, Vout 32-40V (anywhere in that range is fine since the circuit will have a variable linear post regulator, but that part is already figured out so the input voltage can vary by a few volts) and 5.5A out.   If there is also a circuit that could have the voltage switched between the 32-40V out and a lesser voltage like 15-24V, the overall project is for a bench power supply for I am building with an ATX power supply input, but I want a switchable voltage if possible for lower power dissipation at lower Vout of the linear supply.  Of course that could just mean a separate second boost circuit which should probably be easy enough to switch between.  If there were a second design that used an available transformer rather than a custom one for an isolated second channel supply with similar input output specs, that would be of interest as well.  One other consideration if possible would be I will be hand assembling the circuit and the smallest package I can really solder is an SOIC so if the controller is only in a smaller package, I will not really be able to use it.  However the other components are probably of less concern for package size, since substitutions could be easily made for resistors, capacitors, etc.for their through hole counterparts and power components are also very available in through hole as well and so should not be of much concern in that regard. Thank you so much!