This reference design uses a single UCC25800-Q1 to drive two LLC transformers with 600-kHz switching frequency. The transformer used in this design is 750319177 which is an off-the-shelf catalog transformer featuring low-interwinding capacitance of 0.68-pF typical which is beneficial for minimizing common-mode current in gate driver bias applications with high slew rates. This design generates two isolated 18-V rails. Each output can be loaded to 1.5 W.
| Output voltage options | PMP23240.1 | PMP23240.2 |
|---|---|---|
| Vin (Min) (V) | 11.4 | 11.4 |
| Vin (Max) (V) | 12.6 | 12.6 |
| Vout (Nom) (V) | 18 | 18 |
| Iout (Max) (A) | .085 | .085 |
| Output Power (W) | 1.53 | 1.53 |
| Isolated/Non-Isolated | Isolated | Isolated |
| Input Type | DC | DC |
| Topology | Half Bridge- LLC | Half Bridge- LLC |
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
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Design file that contains information on physical board layer of design PCB
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Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | 3-W, Dual 18-V Output Bias Supply Reference Design | PDF | HTML | Aug. 24, 2022 |
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