SG6849

SG6849 —Low-Power, Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 Low-Power, Green-Mode PWM Flyback Power Controller without Secondary Feedback Features ƒ Linearly Decreasing PWM Frequency ƒ Green-Mode Under Light-Load and Zero-Load Conditions ƒ Constant Voltage (CV) and Constant Current (CC) ƒ No Secondary Feedback ƒ Low Startup Current: 5μA ƒ Low Operating Current: 3.6mA ƒ Leading-Edge Blanking (LEB) ƒ Constant Power Limit ƒ Universal AC Input Range ƒ Synchronized Slope Compensation ƒ 150°C OTP Sensor with Hysteresis ƒ VDD Over-Voltage Clamping ƒ Cycle-by-Cycle Current Limiting ƒ Under-Voltage Lockout (UVLO) ƒ Fixed PWM Frequency: 65kHz ƒ Gate Output Maximum Voltage Clamped at 16.7V ƒ Small SSOT-6 Package Applications Low-power, flyback power converters, such as: 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, consumer electronics, and PC 5V standby-power ƒ Replacements for linear transformers and RCC SMPS Description This highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load conditions. T...