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SG684965TZFAIRCHILDN/a2069avaiFlyback & Forward PWM Controllers


SG684965TZ ,Flyback & Forward PWM Controllersfeatures to enhance the performance of low-power ƒ Green-Mode Under Light-Load and Zero-Load flybac ..
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SG684965TZ
Flyback & Forward PWM Controllers
SG6849 —Low-Power, Green-Mode PWM Flyback Power Controller without Secondary Feedback December 2008 SG6849 Low-Power, Green-Mode PWM Flyback Power Controller without Secondary Feedback Features Description This highly integrated PWM controller provides several ƒ Linearly Decreasing PWM Frequency features to enhance the performance of low-power ƒ Green-Mode Under Light-Load and Zero-Load flyback converters. To minimize standby power Conditions consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the ƒ Constant Voltage (CV) and Constant Current (CC) switching frequency under light-load and zero-load ƒ No Secondary Feedback conditions. This green-mode function enables the ƒ Low Startup Current: 5μA power supply to meet international power conservation requirements. ƒ Low Operating Current: 3.6mA The supply voltage V is also used for feedback DD ƒ Leading-Edge Blanking (LEB) compensation to regulate the output voltage without ƒ Constant Power Limit requiring a conventional TL431 and a photo-coupler. An advantage of the SG6849 is a typical startup current of ƒ Universal AC Input Range only 5µA, while the typical operating current can be as ƒ Synchronized Slope Compensation low as 3.6mA. A large startup resistance can be used to ƒ 150°C OTP Sensor with Hysteresis achieve even higher power conversion efficiency. ƒ V Over-Voltage Clamping DD Built-in synchronized slope compensation maintains the stability of peak current-mode control. Proprietary ƒ Cycle-by-Cycle Current Limiting internal compensation ensures constant output power ƒ Under-Voltage Lockout (UVLO) limiting over a universal range of AC input voltages, from 90V to 264V . AC AC ƒ Fixed PWM Frequency: 65kHz ƒ Gate Output Maximum Voltage Clamped at 16.7V The SG6849 provides many protection functions. Pulse- by-pulse current limiting ensures a constant output ƒ Small SSOT-6 Package current, even if a short circuit occurs. The internal protection circuit disables PWM output if V exceeds DD 22.7V. The gate output is clamped at 16.7V to protect Applications the power MOS from over-voltage damage. The built-in Low-power, flyback power converters, such as: over-temperature protection (OTP) function shuts down the controller at 150°C with a 20°C hysteresis. ƒ Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools The SG6849 is designed to provide a low-cost total ƒ Power adapters for ink jet printers, video game solution for flyback converters. It is available in a small consoles, and portable audio players footprint, 6-pin, SSOT-6 package. ƒ Open-frame SMPS for TV/DVD standby and other auxiliary supplies, home appliances, consumer Related Resources electronics, and PC 5V standby-power ƒ Replacements for linear transformers and RCC ƒ AN-6849 - Low Cost, Green-Mode PWM Controller SMPS for Flyback Converters © 2008 SG6849 Rev. 1.6.1
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