UCC28220-Q1

www.ti.com INTERLEAVED DUAL PWM CONTROLLER WITH PROGRAMMABLE MAXIMUM DUTY CYCLE UCC28220-Q1 SLUS789 – MARCH 2008 FEATURES 1 2 Qualified for Automotive Applications 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 Operates From 12-V Supply 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 DESCRIPTION The UCC28220 is a BiCMOS interleaved dual-channel PWM controller. 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. UCC28220 has an UVLO turn-on threshold of 10 V for use in 12-V supplies. It has 8-V turn-off threshold. Additional features include a programmable internal slope compensation with a special circuit that ensures exactly the same slope is added to each channel. The UCC28220 is available in a 16-pin low-profile TSSOP package. TYPICAL APPLICATION VIN (48 V) UCC28220 1 LINEOV N/C 16 B...