AN-1371| Application Note
LM2717 Evaluation Board
LM2717 Evaluation Board
National Semiconductor Application Note 1371 Clinton Jensen October 2005
Introduction
The LM2717 is composed of two high current PWM DC/DC buck converters. The first buck (step-down) converter provides a fixed 3.3V output at up to 1.5A. The second buck converter provides an adjustable output at up to 2A. The LM2717 evaluation board is designed for 3.3V output at up to 1.5A and 5V output up to 2A with an input voltage range of 8V to 20V. The board is ideally set up for converting a
standard 12V rail to 3.3V and 5V found in many applications. The 5V output may be changed to fit other applications as desired. The LM2717 is also ideal for TFT applications with high input voltages. It can convert an 18V to 20V source to 3.3V for the control circuitry and 8V to 15V for the panel bias voltage. The schematic, layout, and bill of materials used follows:
Schematic and Layout
20142801
Schematic
AN-1371
2005 National Semiconductor Corporation
AN201428
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