View bp5131d datasheet:

BP5131D High Voltage Linear LED Driver Description Features BP5131D is a high current precision Linear LED  High integration，all SMTs in small size.  No ECAPs and magnetics Driver，integrated with High Voltage regulation  Integrated with 500V HV MOS, saved on switchers and JFET supply, specially designed for safety components. AC line LED strings forwarded with high voltage  Fast startup and low current.  LED current set by external resistors with ±5% accuracy. In application, it supports a quite small BOM  On chip thermal regulation. benefit from no ECAP and no Magnetics, compile  Compensation for line regulation with EMI and safety standard.  In TO252-3 package. BP5131D can drive precision constant current by option