FAN6791

FAN6791 / FAN6793 — Highly Integrated, Dual-PWM Combination Controller FAN6791 / FAN6793 Highly Integrated, Dual-PWM Combination Controller Features ƒ High-Voltage Startup ƒ Low Operating Current ƒ Interleaved Stand-by PWM / Forward PWM Switching ƒ Green Mode Stand-by PWM / Forward PWM ƒ Linearly Decreasing Stand-by PWM Frequency to 20kHz ƒ Remote On / Off ƒ AC Brownout Protection ƒ Forward PWM with Soft-Start ƒ Frequency Hopping to Reduce EMI Emissions ƒ Cycle-by-Cycle Current Limiting for Stand-by PWM / Forward PWM ƒ Leading-Edge Blanking for Stand-by PWM / Forward PWM ƒ Synchronized Slope Compensation for Stand-by PWM / Forward PWM ƒ GATE Output Maximum Voltage Clamp ƒ VDD Over-Voltage Protection (OVP) ƒ VDD Under-Voltage Lockout (UVLO) ƒ Internal Open-Loop Protection for Stand-by PWM / Forward PWM ƒ Constant Power Limit for Stand-by PWM / Forward PWM 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...