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SG6859A Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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SG6859A Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 13 page March 2010 © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6859A • Rev. 1.0.3 SG6859A Low-Cost, Green-Mode PWM Controller for Flyback Converters Features Green-Mode PWM Supports the “Blue Angel” Standard Low Startup Current: 9μA Low Operating Current: 3mA 300mA Driving Capability 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 SSOT-6 Package 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 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 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 meet even the strictest power conservation requirements. The BiCMOS fabrication process enables reducing the startup current to 9μA and the operating current to 3mA. To further improve power conservation, a large startup resistance can be used. Built-in synchronized slope compensation ensures the stability of peak current mode control. Proprietary internal compensation provides a constant output power limit over a universal AC input range (90VAC to 264VAC). Pulse-by-pulse current limiting ensures safe operation during short-circuits. To protect the external power MOSFET from damage by supply over voltage, the SG6859A’s output driver is clamped at 17V. SG6859A controllers can be used to improve the performance and reduce the production cost of power supplies. The best choice for replacing linear and RCC-mode power adapters, the SG6859A is available in 8-pin DIP and 6-pin SSOT-6 packages. |
Similar Part No. - SG6859A_10 |
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Similar Description - SG6859A_10 |
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