LM3414HV Datasheet | National Semiconductor

features a dimming control input (DIM pin) that allows PWM dimming control. The LM3414HV is available in LLP-8 (3mm x 3mm outline) and e PSOP8 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 ponents only. This evaluation board is also suitable for the LM3414 with maximum acceptable input voltage reduced to 42VDC. Standard Settings of the LM3414HV Evaluation Board Vin range: 4.5V to 65V No. of LEDs: 1 - 18 LED current: 1A Switching frequency: 500 k Hz AN-2076 FIGURE 1. Standard Schematic for the LM3414HV Evaluation Board © 2010 National Semiconductor Corporation .national. AN-2076 Board Connectors and Test Pins FIGURE 2. Connection Diagram Terminal Designation VIN GND LED+ LEDDIM THM+ THM- Description Power supply positive (+ve) connection Power supply negative (-ve) connection Connect to cathode of the serial LED string Connect to anode of the serial LED string PWM dimming signal input (TTL signal patible) Connect to PTC thermal sensor for thermal foldback control Connect to PTC thermal sensor for thermal foldback control .national. AN-2076 Connecting to LEDs and Power Supply The LM3414HV evaluation board can be...