30738394EVAL_ADP1823| Application Note
Evaluation Board for Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking
EVAL-ADP1823
INTRODUCTION
This document describes the design, operation, and test results of the ADP1823 evaluation board. The input range in this evaluation board is 5.5 V to 20 V. The output voltages are configured for VOUT1 = 1.8 V with a maximum current limit at 15 A and VOUT2 = 1.2 V with a maximum current limit at 15 A. All of the results tested from the evaluation board were running at a switching frequency fSW = 300 kHz with VIN = 12 V, VOUT1 = 1.2 V at up to 15 A and VOUT2 = 1.8 V at up to 15 A. of the input voltage. The two channels operate 180 out of phase, which reduces the current stress on the input capacitor and allows the use of a smaller and lower cost input capacitor. The ADP1823 operates at a pin-selectable fixed switching frequency of either 300 kHz or 600 kHz. For some noise sensitive applications, it can also be synchronized to an external clock to achieve switching frequency between 300 kHz and 1 MHz. The ADP1823 includes an adjustable soft start to limit input inrush current, voltage tracking for sequencing o
r DDR termination, independent power-good output, and a power enable pin. It also provides current-limit and short-circuit protection by sensing the voltage on the synchronous MOSFET. The ADP1823 evaluation board schematic is shown in Figure 16. The switching frequency chosen is 300 kHz to get good efficiency over a wide range of input and output conditions. Table 2 shows the bill of materials of the evaluation board.
GENERAL DESCRIPTION
The ADP1823 is a versatile, dual output, interleaved, synchronous PWM buck controller that generates two independent outputs from an input voltage of 2.9 V to 20 V. It is ideal for a wide range of high power applications, such as DSP and processor core, general-purpose power in telecommunications, medical imaging, PC, gaming, and industrial applications. Each channel can be configured to provide output voltage from 0.6 V to 85%
Figure 1. ADP1823 Evaluation Board
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards as supplied "as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 2006 Analog Devices, Inc. All rights reserved.
06361-020
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