LT LT1248CS#PBF

平均电流300kHz

Overview

The LT1248CS provides active power factor correction for universal off-line power systems. By using fixed high frequency PWM current averaging, without the need for slope compensation, the LT1248CS achieves far lower line current distortion with a smaller magnetic element than systems that use either peak-current detection or zero current switching approaches in both continuous and discontinuous modes of operation.

The LT1248CS provides many protection features including peak current limiting and overvoltage protection, and can be operated at frequencies as high as 300kHz.

Features

• High Power Factor Over a Wide Load Range with Line Current Averaging

• International Operation Without Switches

• Instantaneous Overvoltage Protection

• Minimal Line Current Dead Zone

• Typical 250µA Start-Up Supply Current

• Rejects Line Switching Noise

• Synchronization Capability

• Low Quiescent Current: 9mA

• Fast 1.5A Peak Current Gate Driver

Applications

• Universal Power Factor Corrected Power Supplies

• Preregulators Up To 1500W