UCC28512N

高级PFC / PWM组合CONTROLLERS ADVANCED PFC/PWM COMBINATION CONTROLLERS

**DESCRIPON**

The UCC28510 series of combination PFC/PWM controllers provide complete control functionality for any off-line power system requiring compliance with the EC1000−3−2 harmonic

reduction requirements. By combining the control and drive signals for the PFC and the PWM stages into a single device, significant performance and cost benefits are gained. By managing the modulation mechanisms of the two stages leading-edge modulation for PFC and

trailing-edge modulation for PWM, the ripple current in the boost capacitor is minimized.

**FEATURES**

**Provides Control of PFC and PWM Power ****Stages In One Device**

**Leading-Edge PFC, Trailing-Edge PWM ****Modulation for Reduced Ripple**

**Built-In Sequencing of PFC and PWM ****Turn-On**

**2-A Source and 3-A Sink Gate Drive for Both ****PFC and PWM Stages**

**Typical 16-ns Rise Time and 7-ns Fall Time ****into 1-nF Loads**

**PFC Features**

**− Average-Current-Mode Control for ****Continuous Conduction Mode Operation**

**− Highly-Linear Multiplier for Near-Unity ****Power Factor**

**− Input Voltage Feedforward Implementation**

**− Improved Load Transient Response**

**− Accurate Power Limiting**

**− Zero Power Detect**

**PWM Features**

**− Peak-Current-Mode Control Operation**

**− 1:1 or 1:2 PFC:PWM Frequency Options**

**− Programmable maximum duty cycle**

**− Programmable Soft-Start**

**− Two Hysteresis Options for Differing ****Hold-Up Time Requirements**