This active clamp forward design converts an 18-V to 36-V input to a 5-V, 25-W output. The reference design uses the UCC2897A advanced current-mode active-clamp PWM controller to simplify active clamp implementation with a P-channel auxiliary FET. The design achieves 91.7% peak efficiency at 24-V input. The active clamp topology allows for self-driving synchronous rectifier (SR) FETs, lowering cost and complexity on the secondary side. This design also uses a catalog transformer and inductor.
| Output voltage options | PMP22509.1 |
|---|---|
| Vin (Min) (V) | 18 |
| Vin (Max) (V) | 36 |
| Vout (Nom) (V) | 5 |
| Iout (Max) (A) | 5 |
| Output Power (W) | 25 |
| Isolated/Non-Isolated | Isolated |
| Input Type | DC |
| Topology | Forward- Active Clamp |
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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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | 18- to 36-VDC Input, 25-W DC-DC Active Clamp Forward Reference Design | Jun. 18, 2020 |
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