SG6858

SG6858 — Low-Cost, Green-Mode, PWM Controller for Flyback Converters SG6858 Low-Cost, Green-Mode, PWM Controller for Flyback Converters Features ƒ Green-Mode PWM ƒ Supports the ”Blue Angel” Standard ƒ Low Startup Current: 10µA (Maximum) ƒ Low Operating Current: 2.5mA ƒ Leading-Edge Blanking (LEB) ƒ Constant Output Power Limit ƒ Built-in Synchronized Slope Compensation ƒ Current-Mode Operation ƒ Cycle-by-Cycle Current Limiting ƒ Under-Voltage Lockout (UVLO) ƒ Programmable PWM Frequency ƒ VDD Over-Voltage Protection with Auto-Restart ƒ Gate Output Voltage Clamped at 17V ƒ Few External Components Required ƒ SSOT-26 and DIP-8 Packages Available Applications ƒ Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools ƒ Power adapters for ink jet printers, video game consoles, and portable audio players ƒ Open-frame SMPS for TV/DVD standby and other auxiliary supplies, home appliances, PC 5V standby power, and consumer electronics ƒ Replacements for linear transformers and RCC SMPS ƒ Offline High Brightness (HB) LED drivers 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 greenmode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to meet even the strictest power conservation re...