BF1501

BYD Microelectronics Co., Ltd. BF1501 Series Off Line AC/DC Switcher IC General Description The THC0X switcher ICs cost effectively replace all power supplies up to 5W output power based on unregulated isolated linear transformer (50/60HZ). Unlike conventional PWM (pulse width modulation) controllers, it regulates the output voltage in a new method of off-time modulation control. The controller consists of a VCO (voltage control oscillator), Sense and logic circuit, VDD pin, under-voltage lockout circuit, over-voltage protection, current limited circuit, leading edge blanking, over load protection and fault condition auto-restart. They are ideal low power AC/DC adapter/charger for cell phones. Applications „ AC/DC adapter/charger for cell/cordless phones, digital cameras, MP3/portable audio devices etc „ LED Lighting „ Replacements for linear transformers and RCC SMTPS Features z Low start-up current „ Typ.15 µA „ Max.25 µA z Low operating current „ Typ.2 mA „ Max.5 mA z UV...