UCC28056 can drive a PFC power stage up to 300 W, ensuring sinusoidal line input current with low distortion, close to unity power factor while keeping the PFC ‘always on’. When used with the LLC controller UCC256301, this 6-pin device eliminates the need for an auxiliary fly back converter, (typically needed in systems for good standby performance) while achieving less than 80 mW at 230 Vac. The device also enables instant turn on while reducing external component count to a minimum.
Features include:
- Low input current distortion and near unity power factor down to 10% load
- Enables compliance to IEC1000-3-2
- Ultra-low no-load input power (25mW at 115Vac, 40mW at 230Vac)
- Excellent efficiency over range of load
- Enables <60mW standby power at 115Vac and <80mW standby power at 230Vac in PFC+LLC system
- Enables compliance to green power standards without disabling PFC
- EuP Lot 6 Tier 2, CoC Ver. 5 Tier 2, energy star for computers ver. 6.1, DOE level VI
- Ultra-low audible noise output
- Burst mode with soft-entry and soft-exit periods
- Enhanced EA, responds rapidly to load steps without degrading input current distortion
- Valley synchronised turn-on requires no second winding on the boost inductor
- User adjustable valley delay
- Low start-up current consumption (<46 µA)
- Wide VCC range 8.5-34V
- Cycle-by-cycle current limit
- Second independent output voltage protection
- Integrated over-temperature protection