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SG6742MR Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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SG6742MR Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 13 page  June 2009 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6742ML/MR • Rev. 1.0.4 SG6742ML/MR Highly Integrated Green-Mode PWM Controller Features High-Voltage Startup Low Operating Current: 2.7mA Linearly Decreasing PWM Frequency to 22KHz Frequency Hopping to Reduce EMI Emission Fixed PWM Frequency: 65KHz Peak-Current-Mode Control Cycle-by-Cycle Current Limiting Leading-Edge Blanking Synchronized Slope Compensation Internal Open-Loop Protection GATE Output Maximum Voltage Clamp: 18V VDD Under-Voltage Lockout (UVLO) VDD Over-Voltage Protection (OVP) Programmable Over-Temperature Protection (OTP) Internal Latch Circuit (OVP, OTP) Internal Sense Short-Circuit Protection Build-in 5ms Soft-Start Function Constant Power Limit (Full AC Input Range) Internal OTP Sensor with Hysteresis Applications General-purpose switch-mode power supplies and flyback power converters, including: Power Adapters Open-Frame SMPS Description 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 90VAC to 264VAC. 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 VDD drops below the UVLO lower limit, when the controller starts up again. As long as VDD exceeds ~26V, the internal OVP circuit is triggered. SG6742ML/MR is available in an 8-pin SOP package. Ordering Information Part Number Operating Temperature Range OLP Function Package Eco Status Packing Method SG6742MLSY -40 to +105°C Latch 8-Lead Small Outline Package (SOP) Green Tape & Reel SG6742MRSY -40 to +105°C Restart 8-Lead Small Outline Package (SOP) Green Tape & Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. |
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