SG6859 Datasheet | Fairchild Semiconductor

Features - Green-Mode PWM - Supports the “Blue Angel” Standard - Low Start-up Current (9u A) - Low Operating Current (3m A) - Leading-Edge Blanking - Constant Output Power Limit - Universal Input - Built-in Synchronized Slope pensation - 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 ponents 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 strictest power conservation requirements. The Bi CMOS fabrication process enables reducing the start-up current to 9u A, and the operating current to 3m A. To further improve power conservation, a large start-up resistance can be used. Built-in synchronized slope pensation ensures the stability of peak current mode control. Proprietary internal pensation provides a constant output power limit over a universal AC input range (90VAC to 264VAC). Pulse-by-pulse current limiting ensures safe operation even during short-circuits....