LP3669 Datasheet PDF - Shenzhen Xinmao Microelectronics Co., Ltd.

Overview
   LP3669 is a high-performance isolated adapter and charger dual-winding control chip that eliminates the auxiliary winding of the transformer and optimizes the system cost. Constant current and constant voltage functions are achieved by detecting the current and voltage of the primary side of the transformer. Built-in loop stability compensation can omit TL431, optocoupler and auxiliary winding power supply.

FEATUREs
■ Integrated BJT, suitable for isolation solutions below 12W
■ Dual-winding transformer solution, optimize system cost
■ Extremely low standby power consumption, meet level 6 energy efficiency
■ Valley-opening mechanism, improve system efficiency
■ Patented current drive, reduce temperature rise
■ Unique random frequency jitter, improve EMI
■ High-precision constant voltage and constant current control
■ Unique output line loss compensation technology
■ PFM/PWM multi-mode control improves audio characteristics
■ Output short circuit protection function
■ VCC undervoltage protection function
■ Overtemperature protection

APPLICATIONs
■ Adapters and chargers for mobile phones, cordless phones, PDAs, MP3s and other portable devices
■ LED driver power
■ Linear power supply and RCC switching power supply upgrade
■ Other auxiliary power supplies