High power (up to 400W) LED DC/DC power supply design considerations
Unfortunately with this much power to regulate in Boost/buck mode, the stability for all requirements of load step-up or down to tight error limits requires complex control of the input and output energy with slope compensation, absorption with pre-bias, soft start, OVP, OCP, OTP/
Another example is the TI LM5036
This also adds to the cost of the source supply which is an unregulated supply that requires a boost.
My suggestion is to choose the appropriate power supply design from AC to DC so that the architecture is optimized rather than compromised.  This results in only a step-down or Buck mode which is far more stable and less complex.  Power sources of this size commercially also need to have active PFC.
So there is no simple solution to add-on to your supply, yet the volume BOM cost can be, low as a purchased product.
Make vs Buy =&gt; BUY