Low Cost Green-Mode PWM Controller For Flyback Converters

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.
The BiCMOS fabrication process enables reducing the start-up current to 9uA, and the operating current to 3mA. To further improve power conservation, a large start-up 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 even during short-circuits.
To protect the external Power MOSFET from being damaged by supply over voltage, the SG6859s output driver is clamped at 17V. SG6859 controllers CAN be used to improve the performance and reduce the production cost of power supplies. The SG6859 is the best choice for replacing linear and RCC-mode power adapters. It is available in 8-pin DIP and 6-pin SOT-26 packages.
By Fairchild Semiconductor
SG6859 's PackagesSG6859 's pdf datasheet
SG6859DZ DIP
SG6859TZ SOT-23




SG6859 Pinout, Pinouts
SG6859 pinout,Pin out
This is one package pinout of SG6859,If you need more pinouts please download SG6859's pdf datasheet.

SG6859 Application circuits
SG6859 circuits
This is one application circuit of SG6859,If you need more circuits,please download SG6859's pdf datasheet.


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