This reference design features an LLC converter controlled by UCC25800-Q1 (open-loop LLC transformer driver for isolated bias supplies), operating with 9 V and generating three output voltages of 9.0 V with a maximum load current of 50 mA each. An air core transformer was used to avoid the core saturation in the presence of a strong external magnetic field.
Features
- Supplies three isolated outputs with 9 V each and 50 mA from a single 9-V source
- Coreless transformer cannot saturate due to external static magnetic field
- Low input-output interwinding capacitance due to resonant topology
- May use coreless transformer or printed windings on the PCB