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SG6742SZ Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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SG6742SZ Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 14 page Product Specification Highly Integrated Green-Mode PWM Controller SG6742 © System General Corp. - 1 - www.sg.com.tw • www.fairchildsemi.com Version 1.0.1 (IAO33.0083.B0) September 24, 2007 FEATURES High-voltage start-up Low operating current (4mA) Linearly decreasing PWM frequency to 22KHz Frequency jittering 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 (RT) Internal latch circuit (OVP, RT) 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 SG6742 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 linearly decrease the switching frequency at light-load conditions. To avoid acoustic noise problems, the minimum PWM frequency is set above 22KHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage start-up circuitry, the power loss due to bleeding resistors is eliminated. To further reduce power consumption, SG6742 is manufactured using the BiCMOS process, which allows an operating current of 4mA. SG6742 integrates a frequency a hopping function that helps reduce EMI emission of a power supply with minimum line filters. Also, 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 voltages, from 90VAC to 264VAC. SG6742 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 about 26V, the internal OVP circuit is triggered. SG6742 is available in an 8-pin DIP or SOP package. TYPICAL APPLICATION |
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