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BF1005

BYD
Part Number BF1005
Manufacturer BYD
Description ON/OFF Dimming LED Driver IC
Published Sep 16, 2019
Detailed Description BYD Microelectronics Co., Ltd. BF1005 ON/OFF Dimming LED Driver IC General Description The BF1005 is a high performanc...
Datasheet PDF File BF1005 PDF File

BF1005
BF1005

Overview
BYD Microelectronics Co.
, Ltd.
BF1005 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 46 V+ C5 R11 D7 + R10 R7 R12 C6 15 C4 V- D5 FR1 R8 R3 BF1005 2 VDD OUT D6 + C3 R4 GND 3 Vsense Isense R5 M1 R9 R6 Datasheet WI-D06-J-0018 Rev.
A.
0 Page 1 of 8 BYD Microelectronics Co.
, Ltd.
Block Diagram VDD START EN-VDD EN-VDD EN-VCC DIM Vsense Vref CMP Tds VCC REF&BIAS EN-VCC CCCV GND SS BF1005 Fault LOGIC OUT CONTROL LEB OCP Isense Package Type .
Isense GND BF1005 Top view OUT Vsense VDD Pin Definition Pin number 1 2 3 4 5 Pin name Isense GND OUT VDD Vsense Pin description Current sense input.
Ground.
Gate drive output for the externa...


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