UCC28220

Product Folder Order Now Technical Documents Tools & Software Support & Community UCC28220, UCC28221 SLUS544G – SEPTEMBER 2003 – REVISED APRIL 2017 UCC2822x Interleaved Dual PWM Controller With Programmable Max Duty Cycle 1 Features 1 2-MHz High-Frequency Oscillator With 1-MHz Operation Per Channel Matched Internal Slope Compensation Circuits Programmable Maximum Duty Cycle Clamp 60% to 90% Per Channel Peak Current Mode Control With Cycle-by-Cycle Current Limit Current Sense Discharge Transistor for Improved Noise Immunity Accurate Line Undervoltage and Overvoltage Sense With Programmable Hysteresis Opto-Coupler Interface 110-V Internal Start-Up JFET (UCC28221) Operates From 12-V Supply (UCC28220) Programmable Soft Start 2 Applications High Output Current (50-A to 100-A) Converters Maximum Power Density Designs High-Efficiency 48-V Input With Low Output Ripple Converters High-Power Offline, Telecom, and Datacom Power Supplies 3 Description The UCC28220 and UCC28221 are a family of BiCMOS interleaved dual channel PWM controllers. Peak current mode control is used to ensure current sharing between the two channels. A precise maximum duty cycle clamp can be set to any value between 60% and 90% duty cycle per channel. The UCC28220 has an UVLO turnon threshold of 10 V for use in 12-V supplies while UCC28221 has a turnon threshold of 13 V for systems needing wider UVLO hysteresis. Both have 8-V turnoff thresholds. Additional features include a prog...