Description
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
PART NO# Vin(V) Frequency(kHz) StandbyPd(W) Llim(mA) Vsw(V) EMI(dBµV)
LR2257 39703 70 < 0.3 400 > 400V <40 SOP8
Manufacturer:LRC
Datasheet:LR2257.pdf
