This reference design demonstrates a buck converter using UCC28881 that converts a 120Vac input to a 3.3Vdc output. The use of a coupled inductor helps maintain a longer on-time while achieving an extreme conversion ratio for a non-isolated topology. Like other buck topologies, this design makes a low-voltage ripple output while using minimal output capacitance.
| Output voltage options | PMP23445.1 |
|---|---|
| Vin (Min) (V) | 108 |
| Vin (Max) (V) | 132 |
| Vout (Nom) (V) | 3.3 |
| Iout (Max) (A) | .5 |
| Output Power (W) | 1.65 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | AC |
| Topology | Buck- Non Sync |
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 | 120-Vac to 3.3-Vdc, 0.5-A Coupled-Inductor Buck Converter Reference Design | PDF | HTML | Dec. 18, 2023 |
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