This synchronous buck converter module provides efficient DCDC stepdown from 640V input to an adjustable 1.235V output. It uses dual MOSFETs rated up to 75V/80A, frequency operation, and low ESR capacitors for reliable, lownoise power. Output voltage and current are adjustable to fit a range of devices and loads. It includes protection features for safer longterm use. Key features Wide input 640V DC; adjustable output 1.235V DC; adjustable load current Up to 20A continuous output with fast transient response Synchronous rectification for efficiency; low ripple Overcurrent protection and shortcircuit protection Compact module design with terminal blocks for easy wiring Assembly note: tighten terminal screws, and for mechanical stability you can apply a small amount of hot glue to secure inductors and capacitors What makes it useful Stable, configurable power for a variety of projects and systems Robust components suitable for sustained use in demanding environments Compatible with Liion/LiPo battery packs when used with proper wiring and protection Use scenarios Offgrid or solar setups: convert 24V or 12V battery banks to 12V or 5V rails for lights, USB devices, or sensors Vehicles and RVs: generate 12V or USB 5V from a 24V supply for accessories and charging DIY electronics: power LED strips, RGB controllers, microcontroller projects, or lab test benches from a single 640V supply