SG6742MR_ML

The highly integrated SG6742ML/MR PWM controller 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 linearly decrease the switching frequency at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 22KHz. The green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, SG6742ML/MR is manufactured using the BiCMOS process, which allows an operating current of only 2.7mA.

SG6742ML/MR integrates a frequency-hopping function that helps reduce EMI emission of a power supply with minimum line filters. Its 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 voltage range, from 90V_AC to 264V_AC.

SG6742ML/MR 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 until V_DD drops below the UVLO lower limit, when the controller starts up again. As long as V_DD exceeds ~26V, the internal OVP circuit is triggered.

SG6742ML/MR is available in an 8-pin SOP package.

• 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 SG6742MR_ML is available. **

Product	Product Status	Eco Status	*Pricing	Package Type	Leads	Packing Method	Package Drawing	**Package Marking Convention	Qualification Support	RoHS IPC1752	RoHS/REACH/ JIG Certificate of Compliance
SG6742MRSY	Full Production	Green as of Sep 2008	$0.54	SO 8L NB	8	TAPE REEL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:6742MR Line 3:SYB	FIT :  250   ESD (HBM) :  4000  V RTHETA (JA) :  141  °C/W Show more ... Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260