This reference design is a primary-side-regulated flyback design with an output of 33V at 5W steady state. It is designed for LED strobe light applications in smoke detectors and can output 3A surges up to 20ms in a 1Hz cycle. It's a low-cost solution that focuses on small size.
Low-line AC input only.
Primary side adjustment.
Low cost. Pass Class B conduction and EMI testing.
Small size. 
Smoke and heat detectors for residential use.
Ready-to-use system files are available to speed up your design process. If you need **customer service WeChat: 13310830171.
Document 1 contains the test results of the reference design, including efficiency charts, test prerequisites, etc.
Document 2 contains detailed schematics of the design layout and components.
Document 3 contains a complete list of design components, reference identifiers, and manufacturer part numbers.
File 4 contains 3D models of IC components and files used in 2D drawings.
File 5 contains: a design file that contains information about the physical layers of the design PCB.
Document 6 contains a detailed schematic of the design layout of the component placement.
Document 7 contains a complete list of design components, reference identifiers, and manufacturer part numbers.
Flyback controller.
UCC28704—Efficient off-line CV and CC flyback controller with primary-side regulation (PSR).
If you need data sheets, sample testing, procurement, BOM matching and other needs, **Customer Service WeChat: 13310830171.