SG5842JA

SG5842A/SG5842JA — Highly Integrated Green-Mode PWM Controller SG5842A/SG5842JA — Highly Integrated Green-Mode PWM Controller Features ƒ Green-Mode PWM Controller ƒ Low Startup Current: 14µA ƒ Low Operating Current: 4mA ƒ Programmable PWM Frequency with Hopping (SG5842JA) ƒ Peak-Current-Mode Control ƒ Cycle-by-Cycle Current Limiting ƒ Synchronized Slope Compensation ƒ Leading-Edge Blanking (LEB) ƒ Constant Output Power Limit ƒ Totem-Pole Output with Soft Driving ƒ VDD Over-Voltage Protection (OVP) ƒ Programmable Over-Temperature Protection (OTP) ƒ Internal Latch Circuit (OTP, OVP) ƒ Internal Open-Loop Protection ƒ VDD Under-Voltage Lockout (UVLO) ƒ GATE Output Maximum Voltage Clamp: 18V Applications General-purpose switch-mode power supplies and flyback power converters, including: ƒ Notebook Power Adapters ƒ Open-Frame SMPS Description The highly integrated SG5842A/JA series of PWM controllers 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 at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency set above 22KHz. This green-mode function enables the power supply to meet international power conservation requirements. To further reduce power consumption, SG5842A/JA is manufactured using the BiCMOS process. This allows a low startup current, around 14µA, and an operating...