austriamicrosystems AS1322 Evaluation Board Application Note AS1322 Evaluation Board Application Note www.austriamicrosystems.com Revision 1.00 1-4 austriamicrosystems AS1322 Evaluation Board Application Note General Description Board Description Figure 1: Board Description Figure 2: Board Description Connector Description Label Jumper Description Info A B C D VIN GND SHDNN VOUT Power Supply Connectors for VIN and Ground. Shutdown Input Power Output Connector up to +5.0V; <VOUT 1 = Normal operation; 0 = Shutdown Output voltage can be set via Potentiometer “I” Jumper Description Label Jumper Description Info 1/ON = The AS1322 is on. J SHDNN I SHDNN Shutdown Jumper 0/OFF = The AS1322 is off and the current into BATT is ≤1µA (typ). The output voltage can be set with this resistor. Potentiometer Measurement Points Description Label Jumper Description E F G H BATT GND SHDNN VOUT Power Supply Connectors for VIN and Ground. Active-Low Logic Shutdown Input Power Output Connector Info Operational sequence The evaluation board comes with an AS1322A featuring an automatic powersave mode during light load conditions. For continuous switching the AS1322A can be replaced with an AS1322B. 1. If not present get the datasheet for the AS1322 from www.austriamicrosystems.com. Drive the IC on the Demoboard only with the recommended settings and values as described in the datasheet. 2. Connect a +1V to +5.0V power supply to VIN “A” and GND “B”. (VIN should be lower than VOUT. Once started the input voltage can be lower than 1V.) 3. Perform measurements at measurement pins “E-H”. Have fun using the Demoboard. If there are questions do not hesitate to contact us. See contact information at the end of the application note. www.austriamicrosystems.com Revision 1.00 2-4 austriamicrosystems AS1322 Evaluation Board Application Note Layout of demoboard Board schematics and layout Figure 3: Schematics Figure 4: Top view Figure 5: Bottom view Assembly List Label C1 C2 L1 D1 Value 10uF 10uF 3.3uH Type X5R Ceramic X5R Ceramic Coil (LPS4012-332MLB Coilcraft) Shottky Diode (MBR0520-TP) www.austriamicrosystems.com Revision 1.00 3-4 austriamicrosystems AS1322 Evaluation Board Application Note Copyright Copyright © 2007 austriamicrosystems. Trademarks registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. To the best of its knowledge, austriamicrosystems asserts that the information contained in this publication is accurate and correct. Contact Information Headquarters: austriamicrosystems AG Standard Linear A 8141 Schloss Premstätten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 5692 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com Revision 1.00 4-4