This reference design introduces a tiny auxiliary power supply unit (PSU) used to supply automotive insulated-gate bipolar transistor (IGBT) or automotive silicon carbide (SiC) drive. The isolated outputs support three gate controls, each supplied with 21.2V, 2W output. This design uses the planar transformer to reduce the board height and cost. The LM25184-Q1 controller supports primary-side regulation by controlling the flyback voltage from secondary side. There is no need for an additional auxiliary winding. The board maximum efficiency is 89.2%. The design uses six PCB layers, and the temperature rise is 16°C with full load 6W.
| Output voltage options | PMP41144.1 | PMP41144.2 | PMP4144.3 |
|---|---|---|---|
| Vin (Min) (V) | 6 | 6 | 6 |
| Vin (Max) (V) | 28 | 28 | 28 |
| Vout (Nom) (V) | 21.2 | 21.2 | 21.2 |
| Iout (Max) (A) | .1 | .1 | .1 |
| Output Power (W) | 2.12 | 2.12 | 2.12 |
| Isolated/Non-Isolated | Isolated | Isolated | Isolated |
| Input Type | DC | DC | DC |
| Topology | Flyback- Integrated Switch | Flyback- Integrated Switch | Flyback- Integrated Switch |
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 schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
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Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | IGBT and SiC Gate Drive Auxiliary PSU Reference Design with Planar Transformer | PDF | HTML | Mar. 07, 2025 |
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