This reference design is a 36~57-Vdc input, 5-V/4-A output isolated flyback converter using LM5155 and UCC24612. The switching frequency is 250 kHz. With the synchronous rectification controller UCC24612 and a MOSFET at the secondary side, the system achieves 89.29% peak efficiency at 36-V input, which is 3.86% higher than Schottky rectification. The temperature of the rectified MOSFET is 33 degrees Celsius lower than Schottky under full load output. The load regulation in the whole input range is within ±0.5%.
| Output voltage options | PMP40569.1 |
|---|---|
| Vin (Min) (V) | 36 |
| Vin (Max) (V) | 57 |
| Vout (Nom) (V) | 5 |
| Iout (Max) (A) | 4 |
| Output Power (W) | 20 |
| Isolated/Non-Isolated | Isolated |
| Input Type | DC |
| Topology | Flyback- Synchronous |
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | 36~57-Vdc Input, 5-V/4-A Output Isolated Flyback Reference Design | Oct. 17, 2019 |
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