BF1005比亚迪分段调光IC

BF1005 ON/OFF Dimming LED Driver IC
General Description
TheBF1005  is a high performance AC/DC on/off LED driver with four-stages dimming. It uses PFM method to build DCM fly-back power supplies. It operates in primary-side sensing and regulation while removing the need of secondary feedback circuitry. The device operates in PFM in CC mode and ON-OFF in CV mode. TheBF1005 has a four-stages dimming function. That means the output current will be adjusted to ** when the first time power on corresponding to the first stage, 55% when the second time power on corresponding to the second stage, 25% when the third time power on corresponding to the third stage and 10% when the fourth time power on corresponding to the fourth stage. The cycle will restart to stage-one again when the fifth time power on. So this cycle will go on if the power off time is no more than 0.8 seconds.
Features ?
??4 stages dimming function with ordinary switch 
??Typical 5% output Current Accuracy 
??Constant frequency start-up mode accelerate start-up process 
??Eliminates Opto-coupler and TL431 
??Built-in Short Circuit Protection, VDD Over Voltage Protection 
??Cycle-by-Cycle Current Limiting 
??VDD Under Voltage Lockout with Hysteresis (UVLO) 
??Small SOT23-5 Package 
 Application 
??LED lampion 
??LED bulb ( E14、E27 etc) 
??LED bedlamp