低成本绿色模式PWM控制器，用于反激式转换器 Low Cost Green-Mode PWM Controller for Flyback Converters
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.
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.