Low-power Green-mode Pwm Flyback Power Controller Without Secondary Feedback

This highly integrated PWM Controller SG6849 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. This green-mode function enables the power supply to easily meet international power conservation requirements. The supply voltage VDD is also used for feedback compensation, to regulate the output voltage without requiring a conventional TL431 and a photo-coupler. Another advantage of the SG6849 is that the typical startup current is only 5uA, while the typical operating current CAN be as low as 3.6mA. A large startup resistance could be used to achieve even higher power conversion efficiency. Built-in synchronized slope compensation maintains the stability of peak current-mode control. Proprietary internal compensation ensures constant output power limiting over a universal range of AC input voltages, from 90VAC to 264VAC.The SG6849 provides many protection functions. Pulse-by-pulse current limiting ensures a constant output current, even if a short circuit occurs. Also, the internal protection circuit will disable PWM output, if VDD exceeds 22.7V. The Gate output is clamped at 16.7V to protect the power MOS from over-voltage damage. The built-in over temperature protection (OTP) function will shutdown the controller at 150C with a 20C hysteresis. The SG6849 is designed to provide a low-cost total solution for flyback converters. It is available in a small footprint, 6-pin, SOT-26 package. By Unkown
SG6849 's PackagesSG6849 's pdf datasheet
SG6849-65T SOT-26
SG6849-100T SOT-26
SG6849-65D DIP
SG6849-100D DIP




SG6849 Pinout, Pinouts
SG6849 pinout,Pin out
This is one package pinout of SG6849,If you need more pinouts please download SG6849's pdf datasheet.

SG6849 Application circuits
SG6849 circuits
This is one application circuit of SG6849,If you need more circuits,please download SG6849's pdf datasheet.


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