SG6859

Low Cost Green-Mode PWM Controller for Flyback Converters Product Specification SG6859 FEATURES „ Green-Mode PWM „ Supports the “Blue Angel” Standard „ Low Start-up Current (9uA) „ Low Operating Current (3mA) „ Leading-Edge Blanking „ Constant Output Power Limit „ Universal Input „ Built-in Synchronized Slope Compensation „ Current Mode Operation „ Cycle-by-cycle Current Limiting „ Under Voltage Lockout (UVLO) „ Programmable PWM Frequency with Frequency Hopping „ VDD Over Voltage Protection (Auto Restart) „ Gate Output Voltage Clamped at 17V „ Low Cost „ Few External Components Required „ Small SOT-26 and Dip 8 Packages APPLICATIONS General-purpose switching mode power supplies and flyback power converters, such as „ Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools „ Power adapters for ink jet printers, video game consoles, and portable audio players „ Open-frame SMPS for TV/DVD standby and other auxiliary supplies, home appliances, and consumer electronics „ Replacements for linear transformers and RCC SMPS „ PC 5V standby power. DESCRIPTION This highly integrated PWM controller provides several special enhancements designed to meet the low standby-power needs of low-power SMPS. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to easily meet even the s...