LM3464EVAL: 4 Channel @ 350 mA/chan, 12~80V in

This evaluation board demonstrates the high power efficiency and outstanding output current accuracy of the LM3464A typical application circuit. With four LED strings connected, the total output power is about 50W. The schematic, bill of material and PCB layout drawing of the LM3464A evaluation board are provided in this document.

This evaluation board can be adapted to different types of power supply with changes of a few components. The PCB of this evaluation board is pin to pin compatible to both LM3464 and LM3464A with 80V and 95V maximum input voltage respectively. The information being presented in this document are also applicable to both the LM3464 and LM3464A.

The LM3464A is a 4 channel linear LED driver which combined the advantages of high power efficiency of switching regulators and low current ripple of linear current regulators.

With the incorporation of the proprietary Dynamic Headroom Control (DHC) technology, the LM3464A optimizes system efficiency automatically while providing outstanding output stability and accuracy. Each LED current regulators of this board consists of an external MOSFET and a control circuit inside the LM3464A to provide the best flexibility to fulfill the needs of different applications.

The LM3464A includes a built-in Low Drop-Out (LDO) voltage regulator which accepts an input voltage up to 95V (LM3464A) to provide power and voltage references to internal circuits, allowing the LM3464A to adapt to difference source voltages easily. The integrated thermal foldback control circuit protects the LED Strings from damages due to over-temperature. This eventually secures the lifetime of the entire lighting system.

The LM3464A includes a fault handling mechanism which latches off output channels upon open or short circuit of the LED strings, preventing substantial damages due to failures of the LEDs. The number of output channels can be expanded by cascading several LM3464A evaluation boards to achieve high luminous output.