SG6742HL

SG6742HL/HR — Highly Integrated Green-Mode PWM Controller SG6742HL/HR Highly Integrated Green-Mode PWM Controller Features ƒ High-Voltage Startup ƒ Low Operating Current: 2.7mA ƒ Linearly Decreasing PWM Frequency to 22KHz ƒ Frequency Hopping to Reduce EMI Emission ƒ Fixed PWM Frequency: 100KHz ƒ Peak-Current-Mode Control ƒ Cycle-by-Cycle Current Limiting ƒ Leading-Edge Blanking (LEB) ƒ Synchronized Slope Compensation ƒ Internal Open-Loop Protection ƒ GATE Output Maximum Voltage Clamp: 18V ƒ VDD Under-Voltage Lockout (UVLO) ƒ VDD Over-Voltage Protection (OVP) ƒ Programmable Over-Temperature Protection (OTP) ƒ Internal Latch Circuit (OVP, OTP) ƒ Internal-Sense, Short-Circuit Protection ƒ Built-in 6ms Soft-Start Function ƒ Constant Power Limit (Full AC Input Range) ƒ Internal OTP Sensor with Hysteresis Applications General-purpose switch-mode power supplies and flyback power converters, including: ƒ Power Adapters ƒ Open-Frame SMPS Description The highly integrated SG6742HL/HR 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 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 startup circuitry, the power...