This reference design is a tiny three channel isolated bias supply based on Flyback topology. Providing the voltage supply for isolated gate drivers is a typically use case. The design integrates three 21V, 2W isolated outputs and one 7V non- isolated auxiliary output. The design uses a planar transformer integrated into the printed circuit board (PCB) to reduce the board height and system cost. The LM5158-Q1 converter supports primary-side regulation (PSR) by using an auxiliary winding on the primary side. The maximum efficiency is 88%.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Download ready-to-use system files to speed your design process.
Test results for the reference design, including efficiency graphs, test prerequisites and more
Detailed overview of design layout for component placement
Complete listing of design components, reference designators, and manufacturers/part numbers
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Detailed schematic diagram for design layout and components
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Test report | Isolated Bias Supply Reference Design Using PSR Flyback Topology with Planar Transformer | PDF | HTML | Apr 24, 2026 |
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.