General Description

The LD7552 is a low cost, low startup current, current mode PWM controller with green-mode power-saving operation.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.

The special green-mode control does not only achieve low power consumption but also offer a non-audible-noise operation when the LD7552 operates under light load or no load condition.

The LD7552 is designed for the switching adaptor with 30W~60W output. The LD7552 is offered in both SOP-8 and DIP-8 package.

… Patent pending

Features

• High-Voltage CMOS Process with Excellent ESD Protection
• Very Low Startup Current (Typical 5mA)
• l Under Voltage Lockout (UVLO)
• Current Mode Control with Cycle-by-Cycle Peak Current Limiting
• Leading-Edge Blanking on CS Pin
• Programmable Switching Frequency
• Internal Slope Compensation
• Proprietary Green-Mode Control for Power Savingj
• Non-audible-noise Green Mode Control
• 500mA Driving Capability

Applications

• Switching AC/DC Adaptor and Battery Charger
• Open Frame Switching Power Supply
• 384X Replacement

Typical Application