Texas Instruments' UCC28630 targets high-power, primary-side regulated flyback converters. The powerful gate driver and ability to operate in both CCM and DCM make the device suitable for applications with a wide power range. The peak-power mode allows transient peak power delivery up to 200% of nominal rating, with only a 25% peak-current increase, maximizing transformer utilization.
The transformer bias winding is used to sense output voltage for regulation, and for low-loss input voltage sensing. Advanced sampling and processing techniques allow CCM operation, and deliver excellent output voltage regulation performance for optocouplerless designs at power levels of 100 W and higher.