SG5842A

Highly Integrated Green-Mode PWM Controller FEATURES „ Green-Mode PWM Controller „ Low Start-up Current (14µA) „ Low Operating Current (4mA) „ Programmable PWM Frequency with Hopping (5842JA) „ Peak-Current-Mode Control „ Cycle-by-Cycle Current Limiting „ Synchronized Slope Compensation „ Leading-Edge Blanking „ Constant Output Power Limit „ Totem Pole Output with Soft Driving „ VDD Over-Voltage Protection (OVP) „ Programmable Over-Temperature Protection (OTP) www.DataSheet„4U.cInotemrnal Latch Circuit (OTP, OVP) „ Internal Open-Loop Protection „ VDD Under-Voltage Lockout (UVLO) „ GATE Output Maximum Voltage Clamp (18V) APPLICATIONS General-purpose switch mode power supplies and flyback power converters, including: „ Notebook Power Adapters „ Open-Frame SMPS DESCRIPTION The highly integrated SG5842A/JA series of PWM controllers provides several features to enhance the performance of flyback converters. Product Specification SG5842A/JA 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 problem, 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 start-up current, around 14µA, and an operating current of only 4mA. As a result, a ...