LM3466 Series

Multi-String LED current balancer for use with constant current power Supplies

Catalog

Multi-String LED current balancer for use with constant current power Supplies

Part	Outputs and Type	Supplied Contents	Utilized IC / Part	Voltage - Input [Min]	Voltage - Input [Max]	Current - Output / Channel	Supplier Device Package	Type	Mounting Type	Package / Case [y]	Package / Case [x]	Package / Case	Voltage - Supply (Max) [Max]	Applications	Voltage - Supply (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs
Texas Instruments LM3466MREVAL/NOPB	5	Board(s)	LM3466	6 V	70 V	350 mA
Texas Instruments LM3466MR/NOPB						1.5 A	8-SO PowerPad	Linear	Surface Mount	3.9 mm	0.154 in	8-PowerSOIC	70 V	Lighting	6 V	-40 °C	125 ¯C	1
Texas Instruments LM3466MRX/NOPB						1.5 A	8-SO PowerPad	Linear	Surface Mount	3.9 mm	0.154 in	8-PowerSOIC	70 V	Lighting	6 V	-40 °C	125 ¯C	1

Catalog

Multi-String LED current balancer for use with constant current power Supplies

Key Features

• Easy to Design for Lighting Systems Consisting of Multiple LED Strings (Supports Modular Design)Automatically Balances the Current of Every Active LED String, even the Forward Voltage of Each String is DifferentEasy to Pre-Set and Fine-Tune Current Ratio Among LED Strings (e.g., color temperature adjustment or CRI Enhancement)±1% Current Accuracy at Room Temperature and ±1.5% Over TemperatureMaintains Constant Output Power if Some Strings Open (inactive) by Automatically Balancing the Current of Remaining Active LED StringsWorks with a Constant Current Power Supply (ac/dc or dc/dc), and no Communication to/from the Constant Current Power Supply is RequiredOperates with Minimum Voltage Overhead to Maximize Power EfficiencyWide Input Voltage Range from 6 V to 70 VFault Status OutputThermal ShutdownIntegrated 70-V, 1.5-A MOSFET with 2.06 A Current LimitMaximum 70-V per LED String, 20 LEDsLinear Circuitry Does Not Deteriorate EMIDDA-8 Exposed Thermal Pad and TO220-7 PackagesEasy to Design for Lighting Systems Consisting of Multiple LED Strings (Supports Modular Design)Automatically Balances the Current of Every Active LED String, even the Forward Voltage of Each String is DifferentEasy to Pre-Set and Fine-Tune Current Ratio Among LED Strings (e.g., color temperature adjustment or CRI Enhancement)±1% Current Accuracy at Room Temperature and ±1.5% Over TemperatureMaintains Constant Output Power if Some Strings Open (inactive) by Automatically Balancing the Current of Remaining Active LED StringsWorks with a Constant Current Power Supply (ac/dc or dc/dc), and no Communication to/from the Constant Current Power Supply is RequiredOperates with Minimum Voltage Overhead to Maximize Power EfficiencyWide Input Voltage Range from 6 V to 70 VFault Status OutputThermal ShutdownIntegrated 70-V, 1.5-A MOSFET with 2.06 A Current LimitMaximum 70-V per LED String, 20 LEDsLinear Circuitry Does Not Deteriorate EMIDDA-8 Exposed Thermal Pad and TO220-7 Packages

Description

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 70-V, 1.5-A, N-channel power MOSFET with a current limit of 2.06 A. To add one more LED string to the system, only a single resistor, a capacitor, and a LM3466 are required. Other supervisory features of the LM3466 include under-voltage lock-out, fault reporting, thermal latch off, and thermal shutdown protection. The LM3466 consists of only linear circuitry so that the EMI of the application circuit is not deteriorated. The LM3466 lighting system is EMI friendly if the constant current power supply used is complied to EMI standards. The LM3466 is available in the DDA-8 exposed thermal pad and TO220-7 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 70-V, 1.5-A, N-channel power MOSFET with a current limit of 2.06 A. To add one more LED string to the system, only a single resistor, a capacitor, and a LM3466 are required. Other supervisory features of the LM3466 include under-voltage lock-out, fault reporting, thermal latch off, and thermal shutdown protection. The LM3466 consists of only linear circuitry so that the EMI of the application circuit is not deteriorated. The LM3466 lighting system is EMI friendly if the constant current power supply used is complied to EMI standards. The LM3466 is available in the DDA-8 exposed thermal pad and TO220-7