Write the electrical operating envelope
Specify input range and transients, output rails, load behavior, startup, shutdown and fault expectations. Include efficiency, noise and standby requirements where they matter. Define the source and load conditions used to judge performance.
Choose the topology and controller from those requirements. Linear, non-isolated switching and isolated conversion have different constraints. A reference design is useful only when its assumptions and component limits are understood.
Review power paths and control behavior
Identify high-current and high-di/dt loops, switching nodes and sensitive sensing or feedback paths. Place components using the exact controller guidance and review parasitic effects. Check conductor, via, connector and component ratings as a connected system.
Evaluate magnetics, capacitors and switching devices across the operating range. Include tolerance, temperature and relevant transient stresses. Do not use absolute maximum ratings as normal operating targets.
Coordinate thermal, insulation and EMC design
Estimate losses and evaluate heat flow with the intended board, cooling and enclosure. Keep sensitive measurements away from unwanted heat and noise. Review mechanical support for larger components.
Where hazardous voltage or required isolation is involved, use a qualified design and the applicable product requirements for insulation, protection and testing. A generic spacing table or transformer symbol does not establish a compliant finished supply.
Validate before repeat production
Define tests for regulation, transient response, startup, ripple, efficiency, temperature and relevant fault behavior. Use suitable instruments, fixtures and procedures for the energy involved. Record the measurement bandwidth and operating conditions.
Release the approved schematic, layout, BOM and test plan together. Reassess affected behavior after substitutions or layout changes. Provide these requirements during quotation so assembly and test scope can be agreed explicitly.