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FAN6793MY Folha de dados(PDF) 1 Page - Fairchild Semiconductor |
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FAN6793MY Folha de dados(HTML) 1 Page - Fairchild Semiconductor |
1 / 19 page April 2009 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6791 / FAN6793 • Rev. 1.0.2 FAN6791 / FAN6793 Highly Integrated, Dual-PWM Combination Controller Features High-Voltage Startup Low Operating Current Interleaved Stand-by PWM / Forward PWM Switching Green Mode Stand-by PWM / Forward PWM Linearly Decreasing Stand-by PWM Frequency to 20kHz Remote On / Off AC Brownout Protection Forward PWM with Soft-Start Frequency Hopping to Reduce EMI Emissions Cycle-by-Cycle Current Limiting for Stand-by PWM / Forward PWM Leading-Edge Blanking for Stand-by PWM / Forward PWM Synchronized Slope Compensation for Stand-by PWM / Forward PWM GATE Output Maximum Voltage Clamp VDD Over-Voltage Protection (OVP) VDD Under-Voltage Lockout (UVLO) Internal Open-Loop Protection for Stand-by PWM / Forward PWM Constant Power Limit for Stand-by PWM / Forward PWM Applications General-purpose switch-mode power supplies and flyback power converters, including: PC-ATX Power Supplies Description The highly integrated FAN6791/3 dual PWM combination controller provides several features to enhance the performance of 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 20KHz. This 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, FAN6791/3 is manufactured using the CMOS process, which allows an operating current of only 6mA. FAN6791/3 integrates a frequency-jittering function internally to reduce EMI emissions of a power supply with minimum line filters. The built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary internal line compensation ensures constant output power limit. FAN6791/3 provides many protection functions, including brownout protection, cycle-by-cycle current limiting, and an internal open-loop protection circuit to ensure 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 restarts. As long as VDD exceeds ~24.5V, the internal OVP circuit is triggered. |
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Descrição semelhante - FAN6793MY |
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