UCC28221DR

与可编程最大占空比双路交错PWM控制器 INTERLEAVED DUAL PWM CONTROLLER WITH PROGRAMMABLE MAX DUTY CYCLE

DESCRIPON

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.

FEATURES

• 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 Under and Over-Voltage Sense with Programmable Hysteresis

• Opto-Coupler Interface

• 110-V Internal Start-Up JFET UCC28221

• Operates from 12-V Supply UCC28220

• Programmable Soft-Start

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