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The output power is about 1000W and the output voltage is 750V. Is there a DCDC step-down chip recommended?
The requirements do not have much detail. For example, what is the input voltage range? Is it AC or DC?
However, the topologies that can support 1000W are half-bridge, full-bridge, and phase-shifted full-bridge. You can search on TI's web site to find suitable controllers and/or reference designs.
It is mainly used for the lamp board, and the input voltage is 780~850V. It is hoped to add a BUCK circuit to the previous single-stage PFC (UCC28063A scheme)
A buck with 780Vin-850Vin and 750Vout will be operating at 88% to 96% duty cycle. This is a very high duty cycle and does not leave any margin for setpoint/component tolerances, non-overlap time deviation, losses, or load transients.
If you're sure you want a buck topology please create a new E2E post and mention BUCK plus your input/output requirements and it will be routed to the buck converter group.
