This 1.2W isolated reference design provides approximately 24V of 50mA from a 12V automotive power source. The output voltage is split using a Zener regulator to +18V with –5V for an insulated gate bipolar transistor (IGBT) gate drive. The circuit uses the UCC25800-Q1 half-bridge LLC transformer driver operating at a nominal switching frequency of 500kHz. The secondary-side resonant tank frequency is set slightly above the switching frequency to produce a flat gain. For this open-loop design, the output voltage is proportional to the input voltage by the transformer turns ratio. The transformer windings are integrated into the printed circuit board (PCB) and sector wound for no overlap. The result is very low interwinding capacitance and common-mode current, along with high isolation voltage.
| Output voltage options | PMP23486.1 |
|---|---|
| Vin (Min) (V) | 12 |
| Vin (Max) (V) | 12 |
| Vout (Nom) (V) | 18 |
| Iout (Max) (A) | .05 |
| Output Power (W) | .9 |
| Isolated/Non-Isolated | Isolated |
| Input Type | DC |
| Topology | 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
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | 1.2W LLC Isolated Bias Supply Reference Design Using Sector Wound Planar Transformer | PDF | HTML | Sep 9, 2024 |
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