STEVAL-ILL035V2 Multi-channel LED driver with integrated boost controller for medium/large LCD panel backlight based on LED7708 Data brief Description The STEVAL-ILL035V2 product evaluation board is an extension (daughterboard) of the STEVAL- ILL035V1 (motherboard) based on the LED7708 LED driver. It allows implementation of a daisy- chained configuration for applications requiring more than 16 channels. The LED7708 is configured as slave on the STEVAL-ILL035V2, and as master on the STEVAL-ILL035V1. The boost controller section is not used and the supply voltage for the LED strings is derived from the motherboard (STEVAL-ILL035V1, master) by extending the output voltage optimization through Features dedicated hand-shake signals. Additional Wide DC input voltage: 10 V - 28 V daughterboards can be connected to a single motherboard to increase the number of channels. 16-channels with up to 85 mA/channel current The brightness control of the LED strings and the capability and independent PWM brightness fault management options are identical to the control ones available for the STEVAL-ILL035V1 Up to 15 white LEDs per channel evaluation board. The evaluation board is Embedded open-channel and LED short-circuit intended as a solution for medium/large LCD faults management panel backlight drivers, but is suitable for any application involving several LEDs arranged is Expansion connector to cascade other strings (e.g. advertisement panels, signs, gaming, STEVAL-ILL035V2 evaluation boards etc.). RoHS compliant August 2014 DocID026800 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com6:6: 25 25B:B: /7/7 ) ) /7 ) 6:6: (1 /5 (1 /5 6. 0 /7 ) 6. 0 /( /( /. & /. & 9, 9, 6:6: 9& 9& 3 3 675675 0 6. 6. 0 29) ,2 N N ) /7 ) /( /( /. & 287 X X , 6:6: 9& X X 9& 9, (1 /5 3 3 Schematic diagram STEVAL-ILL035V2 1 Schematic diagram Figure 1. STEVAL-ILL035V2 circuit schematic *63* 6* ,, N N 5 5 & &+ &+ &+ &+ &+ &+ &+ &+ &+ &+ &+ &+ 11&& NN &+ &+ X X &+ &+ 5 5 1 * 1 * 1 1 6/7,/7/B6((,(/B6(6 16&6 7/ ,6( 1 +7 ,6( X X 3 &20 5 ( 32 /( B941 B 33 ) B B94 )1/( /5(1 &/,0 1 & X X Q Q / 2 1 & 6< % : )6 96, < 1 &/& 7/ . 3 X X ,/ & & <*66 &*6 . 92 ) 29 Q Q X X ,796B( 9%2267 QQ 1 ,96 1 . 92. ) 29 B6(96,/,B6(/96 7B( ,96 77 NN & ,96 *6&. *66 < B/22 3 3 B/227 7 7B( ,96 QQ 1 . 92. ) 29 9%2267 &.*6 <*66 2/4 DocID026800 Rev 1 - - & & & & & & & & - - - - & & 7373 & & &2&21 1 & & & & 7373 7373 7373 7373 7373 7373 7373 7373 8 8 7373 *66 ,1 & & 287 5 5 *6 ,2 ) ) 8/8/ 5 5 2. 9 7+ 7373 7373 7373 7373 7373 7373 7373 7373 7373 7373 7373 7373 7373 7373 7373 &2&21 1 &2&21 1 ,1 287 ,2 ,2 & & & & & & &2&21 1 &2&21 1 67 9 (9 // 9) )26 9, 6/ 9 * 7( 3* 6* 90,