STEVAL-ILL017V1 Offline constant current LED driver based on the VIPer17 Data Brief Features ■ Input voltage 220 VAC +/- 20% ■ 800 V avalanche rugged power section ■ Provides 500 mA constant current for LED ■ High precision constant current with +/- 5% tolerance (1 sense resistor and 2 resistor bridges with +/- 1% precision) ■ Overtemperature protection ■ LED open-circuit protection ■ LED short-circuit protection ■ PWM operation with frequency jittering for low EMI ■ Operating frequency: – 60 kHz for L type – 115 kHz for H type ■ Standby power < 50 mW at 265 VAC ■ Adjustable and accurate overvoltage protection ■ On-board soft-start ■ Safe auto-restart after a fault condition STEVAL-ILL017V1 VDC source, suitable for illuminating two LEDs in series. The VIPer17 device is an offline converter with an 800 V rugged power section, a PWM control, overcurrent protection, overvoltage and overload protection, hysteretic thermal protection, soft-start and safe auto-restart after the removal of a fault condition. The brown-out protection function is embedded into the high voltage start-up. Applications ■ Adapters for PDAs, camcorders, electric shavers, cellular phones, videogames ■ Auxiliary power supply for LCD/PDP TVs, monitors, audio systems, computers, industrial applications ■ SMPS for set-top boxes, DVD players/ recorders, white goods Burst mode operation and the very low consumption of the device combine to meet standby energy saving regulations. Advanced frequency jittering reduces EMI filter cost. Description The STEVAL-ILL017V1 demonstration board is a 2 W non-isolated offline constant current LED driver based on the VIPer17. The board operates with an input ranging from 176 V to 264 VAC and provides 500 mA of constant current from a 7 September 2008 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 1 2 AC In P1 GND GN 1 3 4 2 C1 C12 10uF 10u 1mH L2 C1 1nF 1n Con Cont Vdd Vd FB BR Sourc Source R1 R13 2.7K 2.7 C4 C6 56nF 56n 2.2n 2.2nF 2 3 C3 2.2uF 2.2u VP Drai DrainDrain Drai U1 ER17 VI PER1 C1 C11 2.2uF 2.2u R4 56 56K R1 240 240K D3 BAT4 BAT46 1 D1 Bridg dge C2 100nF 100n 2 VPOS 4 VNeu VNe 8 7 6 5 1 VL _Fus use Q1 BC817 BC817-40 GND GN R1 R14 1M 10 5 1 6 7 nsformer Transfor 3 T1 8 100K 100 R3 R6 STTH1R06 STTH1R06A C5 10u 10uF D5 rain Drain R5 10K 10 C8 100nF 100n STP S2H100 ST S2H100A D6 C7 12n 12nF 8 82K 82 R7 GND GN C1 C13 1uF 1u Out2 Out1 Vcc+ Vcc C9 220uF 220u 6.8 6.8K R2 U2 TSM103W ccVcc Inv1 Nonin Noninv1 4 3K R8 Inv2 Nonin Noninv2 6 Fuse use 250V 7 1 2/4 2 C10 C1 R1 R10 3.3 3.3K 470pF 470p 1.2 R1 R11 24K 24 R12 R1 1.2 R9 LED ED Ou Out 1 2 P2 Figure 1. 5 1 3 Fuse1 e1 Circuit schematic STEVAL-ILL017V1 Circuit schematic Schematic diagram VLine STEVAL-ILL017V1 2 Revision history Revision history Table 1. Document revision history Date Revision 01-Sep-2008 1 Changes Initial release. 3/4 STEVAL-ILL017V1 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