FAN6754

FAN6754 — Highly Integrated Green-Mode PWM Controller September 2009 FAN6754 Highly Integrated Green-Mode PWM Controller Brownout and Constant Power Limited by HV Pin Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ High-Voltage Startup AC Input Brownout Protection with Hysteresis Low Operating Current: 1.7mA 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 (LEB) Internal Open-Loop Protection GATE Output Maximum Voltage Clamp: 13V VDD Under-Voltage Lockout (UVLO) VDD Over-Voltage Protection (OVP) Programmable Over-Temperature Protection (OTP) Internal Latch Circuit (OVP, OTP) Open-Loop Protection (OLP); Restart for MR, Latch for ML Constant Power Limit (Full AC Input Range) Internal OTP Sensor with Hysteresis Description The highly integrated FAN6754 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 continuously decrease the switching frequency under light-load conditions. Under zero-load and very light-load conditions, FAN6754 saves PWM pulses by entering deep burst mode. This burst mode function enables the power supply to meet international power conservation requirements. FAN6754 integrates a frequency-hopping function internally to reduce EMI emission of a power supply with minimum line f...