This reference design is a universal input, 71.4-V, 7-A constant current, constant voltage (CC/CV) charger for e-bike applications. The UCC28180 device is used for CCM PFC stage for 0.99 power factor and low-current total harmonic distortion. The UCC256403 is used for a half-bridge resonant converter, achieving 95.8% efficiency and fast load transient at constant voltage mode. A flyback using the UCC28910 provides auxiliary power for PFC, LLC, control circuits and cooling fans. The adjustable CC/CV option is reserved for the MCU board to make it feasible for multiple-cell battery charging applications.
- 0.99 power factor at full load output
- 95.8% peak efficiency
- Charging status indication
- Reserved digital option for adjustable CC/CV