This reference design is an AC/DC battery-backup charger with two outputs: system and battery. A 4-SW bidirectional buck-boost charges the battery and supplies system load. An optional microcontroller disables main power sections, reducing stand-by power while collecting parameters for telemetry.
Merkmale
- Achieves 91.8% efficiency at 230VAC with all power stages on (PFC, LLC and battery charger)
- Good option for backup supply in alarm panels and uninterruptible power delivery
- Interleaving modulation in the PFC allows input filter and output capacitor ripple-current reduction, while minimizing the height thanks to two-phase power stage
- The LLC stage enhances light load efficiency (standby power and audible noise) thanks to high and low frequency burst mode scheme
- The third stage provides battery management and leverages power path and bidirectional power flow to achieve the highest efficiency possible, while charging the battery and supplying system power