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.
- Achieves 90% efficiency from 30% to 100% load at 24-V input
- Self-driven SR (using CSD17579Q3A MOSFETs) reduces drive complexity
- Uses catalog magnetics for a cost-effective solution