SG6841

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Highly-Integrated Green-Mode PWM Controller

General Description

The highly integrated SG6841 series of PWM controllers provides several features to enhance the performance of flyback converters.

To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency at light-load conditions. This green-mode function enables the power supply to easily meet international power conservation requirements. To further reduce power consumption, SG6841 is manufactured by using the BiCMOS process. This allows the lowest startup current around 8µA and the operating current is only 4mA. As a result, large startup resistance can be used.

SG6841's built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary internal line compensation ensures constant output power limit over a wide AC input voltages, from 90V_AC to 264V_AC.

SG6841 provides many protection functions. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety should an open-loop or output-short-circuit failure occur. PWM output is disabled till V_DD drops below the UVLO lower limit. Then, the controller starts up again. For OTP, an external NTC thermistor can be applied for over-temperature protection.

SG6841 is available in an 8-pin DIP or SOP package.

Product Status/Pricing/Packing

Fairchild 1,000 piece Budgetary Pricing. *
If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
Top mark packaging information for product SG6841 is available. **

Product	Product Status	Eco Status	*Pricing	Package Type	Leads	Packing Method	**Package Marking Convention	Qualification Support
SG6841DZ	Full Production	ROHS Compliant	$0.57	MDIP 8L	8	RAIL	Line 1:SG6841DZ Line 2:K&60&4 (4-Digit Date Code) &Z (Asm. Plant Code)	Moisture Sensitivity Level (MSL) : NA Max Reflow Temp : 999
SG6841DZ3	Last time buys being accepted	ROHS Compliant		MDIP 8L	8	RAIL	Line 1:SG6841DZ3 Line 2:B&60&4 (4-Digit Date Code) &Z (Asm. Plant Code)	Moisture Sensitivity Level (MSL) : NA Max Reflow Temp : 999
SG6841SZ	Not recommended for new design	ROHS Compliant		SO 8L NB	8	TAPE REEL	Line 1:SG6841SZ Line 2:K&60&4 (4-Digit Date Code) &Z (Asm. Plant Code)	Moisture Sensitivity Level (MSL) : 2 Max Reflow Temp : 260