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 programmable internal slope compensation with a special circuit which is used to ensure exactly the same slope is added to each channel and a high-voltage 110-V internal JFET for easier start-up for the wider hysteresis UCC28221 version.
●The UCC28220 is available in both 16-pin SOIC and low-profile TSSOP packages. The UCC28221 also comes in 16-pin SOIC package and a slightly larger 20-pin TSSOP package to allow for high-voltage pin spacing to meet UL1950 creepage clearance safety requirements.
● 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
