BF1501-DA

BYD Microelectronics Co., Ltd. BF1501-DA Off Line AC/DC Switch IC General Description The BF1501-DA 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, they regulate 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, protection for over-voltage, current limited circuit, leading edge blanking, over load protection and fault condition auto-restart. They are ideal low power AC/DC adapter/charger solution for portable devices. 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 „ Low start-up current z Typ.15 µA z Max.25 µA „ Low operating current z Typ.2 mA ...