BF1005 Datasheet | BYD

BYD Microelectronics Co., Ltd. ON/OFF Dimming LED Driver IC General Description The BF1005 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. The BF1005 has a four-stages dimming function. That means the output current will be adjusted to 100% 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 Typical Application D2 D1 D3 D4 L1 + C1 + C2 R2 V+ C5 R11 D7 + R10 R7 R12 C6...