LD7575PS Integrated Circuit Chip Green-Mode PWM Controller with High-Voltage Start-Up Circuit

Green-Mode PWM Controller with High-Voltage Start-Up Circuit

General Description

The LD7575 is a current-mode PWM controller with excellent power-saving operation. It features a highvoltage current source to directly supply the startup current from bulk capacitor and further to provide a lossless startup circuit. The integrated functions such as the leading-edge blanking of the current sensing, internal slope compensation, and the small package provide the users a high efficiency, minimum external component counts, and low cost solution for AC/DC power applications.

Furthermore, the embedded over voltage protection, over load protection and the special green-mode control provide the solution for users to design a high performance power circuit easily. The LD7575 is offered in both SOP-8 and DIP-8 package.

Features

• High-Voltage (500V) Startup Circuit
• Current Mode Control
• Non-Audible-Noise Green Mode Control
• UVLO (Under Voltage Lockout)
• LEB (Leading-Edge Blanking) on CS Pin
• Programmable Switching Frequency
• Internal Slope Compensation
• OVP (Over Voltage Protection) on Vcc
• OLP (Over Load Protection)
• 500mA Driving Capability

Applications

• Switching AC/DC Adapter and Battery Charger
• Open Frame Switching Power Supply
• LCD Monitor/TV Power

Typical Application

Block Diagram

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