STEVAL-TLL009V1

STEVAL-TLL009V1 Camera flash based on the STCF07 Data brief Features ■ Buck-boost DC-DC converter ■ Drives one power LED up to 1 A in Flash mode ■ Drives one power LED up to 800 mA in continuous mode ■ LED temperature protection and output current control ■ 1.8 MHz (typ.) fixed frequency PWM ■ Synchronous rectification ■ High efficiency across the total input voltage range ■ Peak inductor limited to 2.3 A (typ.) ■ LED disconnected from the battery in shutdown mode ■ NTC LED temperature protection ■ Overvoltage protection: 5.3 V ■ Short-circuit protection and overtemperature protection ■ ULVLO function ■ 1 µA max. shutdown current ■ RoHS compliant The device also includes various functions to protect the chip and the power LEDs, such as an optional external NTC that is supported to protect the LEDs against overheating. It is possible to separately program the current intensity in HIGH and LOW mode using the SEL pin. Description The STEVAL-TLL009V1 demonstration board demonstrates the performance of the STCF07, a dedicated and size-optimized solution for driving a power LED. This device is a buck-boost converter which guarantees proper LED current control over all possible battery voltage and LED forward voltage conditions. The output current control ensures good current regulation over the forward voltage spread characteristics of high-brightness LEDs. June 2012 Doc ID 023188 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 6). #). 2/4 Doc ID 023188 Rev 1 &!5,4 #3%, %.!",% '.$ 28 0'.$ 28 2(# 2,# #/54 2SWLRQDOFRPSRQHQWV .4# &"3 .4# &" &" ,%$ Figure 1. 6"!4 6,8 6/54 1 06"!4 6,8 6,8 , Schematic diagram STEVAL-TLL009V1 Schematic diagram Schematic diagram !-V STEVAL-TLL009V1 2 Revision history Revision history Table 1. Document revision history Date Revision 08-Jun-2012 1 Changes Initial release. Doc ID 023188 Rev 1 3/4 STEVAL-TLL009V1 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 TWO AUTHORIZED ST REPRESENTATIVES, 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. © 2012 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 - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 4/4 Doc ID 023188 Rev 1