data brief for further information contact your local stmicroelectronics sales office. november 2010 doc id 17237 rev 2 1/6 6 STEVAL-ILL031V1 digital constant-current controller for led driving based on the stm8s208x features dc input voltage: 48 v buck stage adapts output voltage to drive leds with selected current four dc-dc buck converters allow driving of 4 led strings, managing up to 120 w employs 3 w leds to obtain 30 w-per-string (10 leds in series in each string) low voltage-sensing circuitry logic level mosfets driven by the microcontroller without gate driver (ground referred) high efficiency (up to 98%) rohs compliant description the purpose of the STEVAL-ILL031V1 demonstration board is to present a new digital approach to performing real average current control on an led streetlighting platform. this led streetlight platform is developed on a dc-dc ?inverse buck? converter, taking advantage of power switch control and conditioning signal circuitry for current sensing. benefits of this design include low energy consumption, low maintenance, and reduced size and weight. the solution is customized for streetlighting applications, but can be extended to many other segments. STEVAL-ILL031V1 www.st.com
schematic diagrams STEVAL-ILL031V1 2/6 doc id 17237 rev 2 1 schematic diagrams figure 1. control stage schematic (1 of 2) ! - v +5v c19 1uf ti m2_c h 3 lcd_cs +5v r20 4k7 +5v r21 4k7 pd1_swim r22 4k7 reset# r23 0 j11 swim connector 1 2 3 4 r13 10k c13 100nf sw1 reset c15 180pf ti m2_c h3 reset# pe6-ch9-secondstring pe7-ch8-first string sensing-secondstring sensing-first string +5v_vdda c21 10nf c20 10uf enable thirdstring enable secondstring spi_mosi_lcd enable first string vdda sensing-fourthstring pf3-ch11-fourthstring +5v pc6_mosi r14 1m c16 20pf c14 20pf r15 68r x1 24mhz osc out osc i n p1 10k 1 3 2 sensing-thirdstring pf0-ch10-thirdstring pwm1-firststring pwm2-secondstring pwm4-fourthstring pwm3-thirdstring pwm1-pc1 pwm3-pc3 pwm2-pc2 pwm4-pc4 r30 0r +5v_vdda r19 0r pf4-ch12-dimming u1 stm8s208rb vdda 19 vssa 20 vref - 21 pf0/ain10 22 pb7/ain7 23 pb6/ain6 24 pb5/ain5/[i 2c_sda] 25 pb4/ain4/[i 2c_scl] 26 vddio_2 40 pc6/spi_mosi 41 pc7/spi_miso 42 pg0/can_tx 43 pg1/can_rx 44 pg2 45 pg3 46 pg4 47 pd6/uart3_rx 63 pd5/uart3_tx 62 pd4/tim2_ch1/[beep] 61 pd3/tim2_ch2/[adc_etr] 60 pd2/tim3_ch1/[tim2_ch3] 59 pd1/swim 58 pf6/ain14 14 pf5/ain13 15 pf7/ain15 13 pb2/ain2/[ tim1_ch3n] 28 pd7/tli/ [tim1_ch4] 64 nrst 1 pa 1/ osc i n 2 pa 2/ osc ou t 3 vssio_1 4 vss 5 vcap 6 vdd 7 vddio_1 8 pa3/tim2_ch3/[tim3_ch1] 9 pa 4/ u ar t1_r x 10 pa 5/ u ar t1_tx 11 pa 6/ u ar t1_c k 12 pf4/ain12 16 pf3/ain11 17 vref + 18 pb0/ain0/[ tim1_ch1n] 30 pe7/ain8 31 pe6/ain9 32 pe5/spi_nss 33 pc1/tim1_ch1 34 pc2/tim1_ch2 35 pc3/tim1_ch3 36 pc4/tim1_ch4 37 pi0 48 pg5 49 pg6 50 pg7 51 pe4 52 pe3/tim1_bkin 53 pe2(t)/i 2c_sda 54 pe1(t)/i2c_scl 55 vssio_2 39 pe0/clk_cco 56 pb3/ain3/[ tim1_etr] 27 pd0/ tim3_ch 2/[ ti m1_bki n ]/[ clk_c co] 57 pb1/ain1/[ tim1_ch2n] 29 pc5/spi_sck 38 c17 470nf pg1 r16 0 r17 0 pg2 l5 bead dimming pg3 c18 100nf pa5 uart_tx pa4 uart_rx +5v j9 comm connector 1 2 4 3 enable_1 enable_2 j10 con4a 1 3 2 4 pb6_joystick_up pb5_joystick_right pb4_joystick_left joy_down pb7_joystick_down joy_right joy_up joy_left vref + r18 4k7 +5v d5 r24 1k d6 r25 1k d7 gnd r27 1k d8 r81 3k r26 1k joy_sel pg0_lcd_cs +5v enable fourthstring pd7_joy stick_sel r29 0r
STEVAL-ILL031V1 schematic diagrams doc id 17237 rev 2 3/6 figure 2. control stage schematic (2 of 2) ! - v # p & # p & ' . $ # n & # n & ' . $ # n & # p & 2 + 2 + 2 + 2 + 2 + 6 * / 9 ? 3 % , * / 9 ? $ / 7 . * o y s t i c k * / 9 ? 5 0 * / 9 ? , % & 4 * / 9 ? 2 ) ' ( 4 2 2 * / 9 3 4 ) # +
- 4
! ' . $ * 2 2 # p & 2 2 2 2 2 2 # n & ' . $ # n & ' . $ 2 ' . $ # n & # n & # n & 6 # p & # p & # p & 6 6 3 e n s i n g
& i r s t 3 t r i n g 3 e n s i n g
3 e c o n d 3 t r i n g 3 e n s i n g
4 h i r d 3 t r i n g 3 e n s i n g
& o u r t h 3 t r i n g ' . $ ' . $ * 3 % . 3 ) . ' # / . . % # 4 / 2
- ! , % 0 l a c e o n b o t t o m s i d e 0 7 -
3 e c o n d 3 t r i n g 0 7 -
& i r s t 3 t r i n g 0 7 -
4 h i r d 3 t r i n g * 0 7 - # / . . % # 4 / 2
- ! , % 0 7 -
& o u r t h 3 t r i n g ' . $ ' . $ $ 2 % $ 2 k ' . $ ' . $ ' . $ 0 l a c e o n b o t t o m s i d e
schematic diagrams STEVAL-ILL031V1 4/6 doc id 17237 rev 2 figure 3. power stage schematic ! - v 6 0 7 -
& o u r t h 3 t r i n g 0 7 -
4 h i r d 3 t r i n g 0 7 -
3 e c o n d 3 t r i n g 0 7 -
& i r s t 3 t r i n g 3 e n s i n g
3 e c o n d 3 t r i n g 3 e n s i n g
4 h i r d 3 t r i n g 6 b u s
6 b u s 6 b u s
6 b u s 6 b u s
6 b u s 6 b u s 3 e n s i n g
& o u r t h 3 t r i n g
6 b u s ' . $ ' . $ 6 2 2 7 # u
6 # n & 6 # u
6 # n &
6 1 3 4 . . &
3 / 4 # u
6 $ # n &
6 2 ? # p * # / . 2 ? , # n &
6 , # p # / . * * # / . 2 2 7 $ 1 3 4 . . &
3 / 4 # p , # p # u
6 2 ? # n &
6 $ , $ 2 ? # / . * .
$ / $ # u & 6 2 2 7 * # / . 2 ? ? 2 1 3 4 . . &
3 / 4 # / . * 2 2 7 2 ? 1 3 4 . . &
3 / 4 2 ? 3 4 0 3 , !
3 - ! 3 4 0 3 , !
3 - ! 3 4 0 3 , !
3 - ! 3 4 0 3 , !
3 - !
STEVAL-ILL031V1 revision history doc id 17237 rev 2 5/6 2 revision history table 1. document revision history date revision changes 23-apr-2010 1 initial release. 11-nov-2010 2 ? changed board photo on coverpage ? divided control stage schematic diagram into two figures ( figure 1 and figure 2 ) to improve readability ? added figure 3: power stage schematic
STEVAL-ILL031V1 6/6 doc id 17237 rev 2 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 he rein 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 as sumes 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. i f 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 whatsoev er 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 parti cular 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 milita ry, 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 whatsoev er, 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. ? 2010 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com
|
