UCC28221 Datasheet | Texas Instruments

Features - 1 2-MHz High-Frequency Oscillator With 1-MHz Operation Per Channel - Matched Internal Slope pensation 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, Tele, and Data Power Supplies 3 Description The UCC28220 and UCC28221 are a family of Bi CMOS 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 pensation 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 es 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. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) UCC28220, UCC28221 SOIC (16) TSSOP (16) 9.00 mm × 3.90 mm 5.00 mm × 4.40 mm TSSOP (20) 6.50 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the...