This reference design is a 48W, low-profile DC/DC auxiliary power supply targeting server PSU applications. The design features an integrated flyback controller with a Gallium Nitride (GaN) power switch. The design achieves a height of less than 10mm by utilizing a low-profile planar printed circuit board (PCB) transformer, meeting the high power density requirements of modern server PSU applications. The flyback converter UCG28824 incorporates VCC self-bias functionality, which simplifies the planar transformer PCB winding design by eliminating the need for auxiliary windings and associated VCC rectifier circuity. This supply operates using the PFC bus voltage as an input, and generates two isolated 12V/3A, 24V/0.1A outputs and a non-isolated 18V/0.5A output.
| Output voltage options | PMP41184.1 | PMP41184.2 | PMP41184.3 |
|---|---|---|---|
| Vin (Min) (V) | 127 | 127 | 127 |
| Vin (Max) (V) | 400 | 400 | 400 |
| Vout (Nom) (V) | 12 | 18 | 24 |
| Iout (Max) (A) | 3 | .5 | .1 |
| Output Power (W) | 36 | 9 | 2.4 |
| Isolated/Non-Isolated | Isolated | Non-Isolated | Isolated |
| Input Type | DC | DC | DC |
| Topology | Flyback- Quasi Resonant | Flyback- Quasi Resonant | Flyback- Quasi Resonant |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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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 | PMP41184 Test Report | PDF | HTML | May 20, 2026 |
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