Constant on-time Buck Converter IC for High Power Buck Converter

Hello Everyone,

I am working on a design for a High power (~10 kW) Buck converter circuit that can step down a variable input voltage (which can vary anywhere from 300 V DC to as high as 1 kV DC) down to a regulated 36 V DC. My company, Resonance Group, designs high speed, solid-state relay switches which use digital 5V inputs to turn them on and off, and we would like to design a buck controller that will use these switches for the business end of the power converter circuit.

I have been doing some reading on the various feedback control topologies available for DC-DC converters. The one that seems to fit my application best is the Constant On-time controller since it doesn't require any elaborate feedback loop compensation circuitry. Also, for my application, it is not important for the switching frequency to be constant.

I'm currently looking for a good COT buck controller IC which can supply the digital output signals for me to route to the solid-state relay boards. It seems like most of the ones I've found so far don't ground reference the high side switch (since they assume to drive the high side switch directly). Since, as far as I know, there are no controller ICs available which can directly interface with such high voltage, I wanted to use an isolated high voltage divider to supply the feedback voltage signal from the circuit to the controller while routing the switch control outputs to the SSRs through isolated outputs (I'm planning to use a synchronous buck topology). Does anyone know of any good COT controller ICs which have separate, ground referenced logic outputs for driving the high and low-side switches in the buck converter circuit?

Thank you,

Jason Owens