LESHAN RADIO COMPANY, LTD.
LR2257 AC/DC Current Mode PWM
power management controller
The LR2257 AC—DC is a high efficiency current-mode PWM power supply controller that drives an internal
NPN transistor for high voltage switching.
Apply with BiCMOS technology, the device consist of Bandgap reference voltage, Oscillator, High voltage switching
transistor and build in safety features of over current and over voltage protection mechanisms Delivering up to 3W yet consumes, the typical application of the device will include:
z Battery Charger, such as handset phone
z Power Adapter
z Offline Power Generator
z Etc.
¾ Lowest Total Cost Solution ¾ Low Power for Green Environments
Protection, as l...