FAN6793 Datasheet | Fairchild Semiconductor

FAN6791 / FAN6793 - Highly Integrated, Dual-PWM bination Controller FAN6791 / FAN6793 Highly Integrated, Dual-PWM bination 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 20k Hz - 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 - Synchronized Slope pensation 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 Description The highly integrated FAN6791/3 dual PWM bination 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 20k Hz. 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 6m A. 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 pensation achieves stable peak-current-mode control. The proprietary internal line pensation ensures constant output power limit. FAN6791/3 provides many protection functions, including brownout protection,...