Green-Mode PWM Controller - Fairchild Semiconductor
Description
SG6858 — Low-Cost, Green-Mode, PWM Controller for Flyback Converters
SG6858 Low-Cost, Green-Mode, PWM Controller for Flyback Converters
Features
Green-Mode PWM Supports the ”Blue Angel” Standard Low Startup Current: 10µA (Maximum) Low Operating Current: 2.
5mA Leading-Edge Blanking (LEB) Constant Output Power Limit Built-in Synchronized Slope Compensation Current-Mode Operation Cycle-by-Cycle Current Limiting Under-Voltage Lockout (UVLO) Programmable PWM Frequency VDD Over-Voltage Protection with Auto-Restart Gate Output Voltage Clamped at 17V Few External Components Required SSOT-26 and DIP-8 Packages Available
Applications
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, PC 5V standby power, and consumer electronics
Replacements for linear transformers and RCC
SMPS
Offline High Brightness (HB) LED drivers
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 greenmode 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 10µA and the operating current to 2.
5mA.
To further improve power conservation, a large startup resistance can be used.
Built-in synchronized slope compensation ensures the stability of peakcurrent-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 even during short circuits...
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