STEVAL-ILL014V1 Evaluation board for the STCS1 constant current controller for high brightness LEDs Data Brief Features ■ Input voltage (VIN): 4.5 V to 40 V ■ Less than 0.5 V voltage overhead ■ Up to 1.5 A output current ■ PWM dimming pin ■ Shutdown pin ■ LED disconnection diagnostic Description The best way to power LEDs is to control the forward current in order to achieve good matching of light output. LED manufacturers specify the characteristics (such as lumens, beam pattern, color) of their devices at a specified forward current. STEVAL-ILL014V1 The STEVAL-ILL014V1 evaluation board demonstrates the operation of the STCS1 constant current LED driver. The STCS1 is capable of controlling the LED current under several application conditions, while also providing useful features that make it suitable for different applications such as advertising signs, automotive interior and exterior lighting, and emergency vehicle warning lights. May 2008 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Vcc J4 5V EN GND J2 PWM J3 5V PWM GND 1 2 3 1 2 1 2 3 Rf 5V 0 5V IN PWM 0 Cbypass 0.1uF,50V 100 0 C3 1uF, 50V Test point 1 0 4 3 2 1 VIN 5 Rsense 0.33, 1%, 0805 FB 6 7 8 L7805 GND SLOPE DISC STCS1A DRAIN EN PWM Vcc U1 0.33uF, 50V C6 1 U3 3 C7 100nF R13 180 R1 100nF, 6.3V 5V 0 R15 10k 2N7002 M1 5V This subcircuit is present on EVB only if the LED is mounted. 0 1nF J5 D1 LH R974 VOUT 0 GND ND 2 2/4 Cslope ope1 0 R17 1.8k NTC 10k 5V Vcc 0 D3 LUMILEDS LXHL PW09 1 2 3 4 GND Vcc A K J1 Figure 1. 2 1 1 Cslope ope2 D4 BAT46 Board schematic STEVAL-ILL014V1 Board schematic Schematic diagram STEVAL-ILL014V1 2 Revision history Revision history Table 1. Document revision history Date Revision 05-May-2008 1 Changes Initial release. 3/4 STEVAL-ILL014V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 4/4