LM3414 LM3414HV 1A 65V LED Driver PSOP-8 Evaluation Board
AN-2076 LM3414HV 1A 65V LED Driver Evaluation Board (Rev. B)
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10 Aug 2010 1,040 views Read Abstract
The LM3414HV is a 65V floating buck LED driver that designed to drive up to 18 pieces of serial High Brightness LEDs (HBLEDs) with up to 1000 mA LED forward current. With the incorporation of the proprietary Pulse-Level-Modulation (PLM) technology, the LM3414HV requires no external current sensing resistor to facilitate LED current regulation. The LM3414HV features a dimming control input (DIM pin) that allows PWM dimming control. The LM3414HV is available in LLP-8 (3 mm x 3 mm outline) and ePSOP8 to fulfil the requirements of small solution size and high thermal performance respectively. In order to demonstrate the performance of the LM3414 family, the LM3414HV is selected for the evaluation boards because of the wide input voltage range (4.5V to 65V) providing the best flexibility to fit the requirements of different applications.
Two versions of evaluation board with identical schematic are available with the LM3414HV in either LLP-8 or PSOP-8 package. The board with LLP-8 package demonstrates the high power density of the device. The board with PSOP-8 package demonstrates the functionality of the LM3414HV with enhanced thermal performance. The schematic, bill of materials and PCB layout for the evaluation boards are provided in this document. The evaluation boards can be adapted to different application requirements by changing the values of a few components only. This evaluation board is also suitable for the LM3414 with maximum acceptable input voltage reduced to 42VDC.