The LM3466MR/NOPB is a multi-string LED Current Balancer for use with constant current power supplies. The LM3466 integrates a linear LED driver for lighting systems which consist of multiple LED strings powered by a constant current power supply. It balances the current provided by the supply in a pre-set ratio for each active LED string, where an active string is a fully turned on LED string, regardless of the number of strings connected to the supply or the forward voltage of each LED string. If any LED string opens during operation, the LM3466 automatically balances the supply current through all of the remaining active LED strings. As a result, the overall brightness of the lighting system is maintained even if some LED strings open during operation. The LM3466 lighting system is simple to design owing to a proprietary control scheme. To minimize the component count, the LM3466 integrates a 70V, 1.5A, N-channel power MOSFET with a current limit of 2.06A.
● Easy to design for lighting systems consisting of multiple LED strings (supports modular design)
● Easy to pre-set and fine-tune current ratio among LED strings
● ±1% Current accuracy at room temperature and ±1.5% over-temperature
● Operates with minimum voltage overhead to maximize power efficiency
● Fault status output
● Thermal shutdown
● Integrated 70V/1.5A MOSFET with 2.06A current limit
● Maximum 70V per LED string, 20 LEDs
● Linear circuitry does not deteriorate EMI
● Green product and no Sb/Br
