5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE __ 2 PRODUCTION KEITH S. 5/20/11 D D P1 B U9 LT3990EMSE 6 4 14 3 5 7 10 12 15 VIN SW L50 33uH LPS6225-333ML 9 C27 0.22uF 16V 0603 EN/UVLO PG BOOST NC NC NC NC NC NC BD FB FB GND VIN GND LED7+ LED7LED5+ LED5LED35+ LED35LED33+ LED33LED47LED47+ LED45LED45+ LED11LED11+ LED9LED9+ LED15+ LED15LED13+ LED13LED43+ LED43LED41+ LED41LED40LED40+ LED38LED38+ LED4LED4+ LED2LED2+ LED24+ LED24LED22+ LED22LED20+ LED20LED18+ LED18LED32LED32+ LED30LED30+ LED28LED28+ LED26LED26+ 8 99 97 95 93 91 89 87 85 83 81 79 77 75 73 71 69 67 65 63 61 59 57 55 53 51 49 47 45 43 41 39 37 35 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 RT 11 13 VCC R2 1.00M 1% 0402 C28 22pF 0402 C29 22uF 6.3V 0805 C 1 2 16 R3 576k 1% 0402 R5 374k 1% 0402 (400kHz) 17 C 100 98 96 94 92 90 88 86 84 82 80 78 76 74 72 70 68 66 64 62 60 58 56 54 52 50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 LED8+ LED8LED6+ LED6LED36+ LED36LED34+ LED34LED48LED48+ LED46LED46+ LED12LED12+ LED10LED10+ LED16+ LED16LED14+ LED14LED44+ LED44LED42+ LED42LED39LED39+ LED37LED37+ LED3LED3+ LED1LED1+ LED23+ LED23LED21+ LED21LED19+ LED19LED17+ LED17LED31LED31+ LED29LED29+ LED27LED27+ LED25LED25+ B NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603, ALL CAPACITOR ARE 0805. TSW-150-07-L-D LED1 TO LED48 UP TO 30V CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 TECHNOLOGY JW KEITH S. TITLE: SCHEMATIC 48-CHANNEL LED DRIVER WITH PWM GENERATOR AND SERIAL INTERFACE SIZE IC NO. N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: LT8500EUHH / LT3595AEUHH DEMO CIRCUIT 1552A Wednesday, August 03, 2011 2 SHEET 1 1 REV. 3 OF 5 A 5 4 PVIN 2 1 VIN L49 10uH C1 - C6 0.33uF 50V 3 VIN C7 0.33uF 50V C8 - C17 0.47uF 50V C18 0.47uF 50V C19 0.47uF 50V C20 0.47uF 50V C21 0.47uF 50V C22 0.47uF 50V C23 0.47uF 50V C24 0.47uF 50V C25 0.47uF 50V LED32LED31LED30LED29LED28LED27LED26LED25- R1 4.99 D L1 100uH L2 100uH L3 100uH L4 100uH L5 100uH L6 100uH L7 100uH D L8 100uH LED25+ LED26+ LED27+ LED28+ LED29+ LED30+ LED31+ LED32+ 46 L1 5 33 45 SW1 44 L2 43 SW2 40 L3 41 SW3 38 L4 39 SW4 37 L5 36 SW5 35 L6 34 SW6 31 32 L7 SW7 29 L8 VIN VIN PWM25 PWM26 PWM27 PWM28 PWM29 PWM30 PWM31 PWM32 SW8 GND GND GND C 47 48 49 50 25 26 27 28 30 PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 PWM8 PWM9 PWM10 PWM11 PWM12 PWM13 PWM14 PWM15 PWM16 U1 LT3595AEUHH 14 42 57 C 19 20 21 22 53 54 55 56 PWM17 PWM18 PWM19 PWM20 PWM21 PWM22 PWM23 PWM24 VCC 23 OPENLED 24 SHDN VCC OPENLED VCC SHDN R19 33k RSET L16 SW16 L15 SW15 L14 SW14 L13 SW13 L12 SW12 L11 SW11 L10 SW10 1 2 3 4 7 6 9 8 10 11 12 13 16 15 L9 18 52 51 SW9 R18 49.9k 30mA C26 10uF 10V 17 LED17+ LED18+ LED19+ LED20+ LED21+ LED22+ LED23+ LED24+ B L16 100uH L15 100uH L14 100uH L13 100uH L12 100uH L11 100uH L10 100uH B L9 100uH LED24LED23LED22LED21LED20LED19LED18LED17- VIN C32 0.47uF 50V C33 0.47uF 50V C34 0.47uF 50V C35 0.47uF 50V C36 0.47uF 50V C37 0.47uF 50V CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 C38 0.47uF 50V C39 0.47uF 50V APPROVALS PCB DES. JW APP ENG. KEITH S. TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 48-CHANNEL LED DRIVER WITH PWM GENERATOR AND SERIAL INTERFACE SIZE N/A SCALE = NONE 2 DATE: IC NO. LT8500EUHH / LT3595AEUHH DEMO CIRCUIT 1552A Wednesday, August 03, 2011 SHEET 2 1 REV. 3 OF 5 A 5 4 3 2 1 VIN VIN C41 - C50 0.47uF 50V C51 0.47uF 50V C52 0.47uF 50V C53 0.47uF 50V C54 0.47uF 50V C55 0.47uF 50V C56 0.47uF 50V C57 0.47uF 50V C58 0.47uF 50V LED40LED39LED38LED37LED4LED3LED2LED1- D L17 100uH L18 100uH L19 100uH L20 100uH L21 100uH L22 100uH L23 100uH D L24 100uH LED1+ LED2+ LED3+ LED4+ LED37+ LED38+ LED39+ LED40+ 46 L1 5 33 45 SW1 44 L2 43 SW2 40 L3 41 SW3 38 L4 39 37 SW4 L5 36 SW5 35 L6 34 SW6 31 L7 32 29 SW7 L8 30 SW8 VIN VIN GND GND GND C 47 48 49 50 25 26 27 28 PWM1 PWM2 PWM3 PWM4 PWM37 PWM38 PWM39 PWM40 PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 PWM8 PWM9 PWM10 PWM11 PWM12 PWM13 PWM14 PWM15 PWM16 U2 LT3595AEUHH 14 42 57 C 19 20 21 22 53 54 55 56 PWM41 PWM42 PWM43 PWM44 PWM13 PWM14 PWM15 PWM16 VCC 23 OPENLED 24 SHDN OPENLED VCC SHDN RSET L16 SW16 L15 SW15 L14 SW14 L13 SW13 L12 SW12 L11 SW11 L10 SW10 1 2 3 4 7 6 9 8 10 11 12 13 16 15 L9 52 51 SW9 18 R39 C59 10uF 10V 49.9k 30mA 17 LED41+ LED42+ LED43+ LED44+ LED13+ LED14+ LED15+ LED16+ B L32 100uH L31 100uH L30 100uH L29 100uH L28 100uH L27 100uH L26 100uH B L25 100uH LED16LED15LED14LED13LED44LED43LED42LED41- VIN C60 0.47uF 50V C61 0.47uF 50V C62 0.47uF 50V C63 0.47uF 50V C64 0.47uF 50V C65 0.47uF 50V CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 C66 0.47uF 50V C67 0.47uF 50V APPROVALS PCB DES. JW APP ENG. KEITH S. TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 48-CHANNEL LED DRIVER WITH PWM GENERATOR AND SERIAL INTERFACE SIZE N/A SCALE = NONE 2 DATE: IC NO. LT8500EUHH / LT3595AEUHH DEMO CIRCUIT 1552A Wednesday, August 03, 2011 SHEET 3 1 REV. 3 OF 5 A 5 4 3 2 1 VIN VIN C68 - C77 0.47uF 50V C78 0.47uF 50V C79 0.47uF 50V C80 0.47uF 50V C81 0.47uF 50V C82 0.47uF 50V C83 0.47uF 50V C84 0.47uF 50V C85 0.47uF 50V LED48LED47LED46LED45LED12LED11LED10LED9- D L33 100uH L34 100uH L35 100uH L36 100uH L37 100uH L38 100uH L39 100uH D L40 100uH LED9+ LED10+ LED11+ LED12+ LED45+ LED46+ LED47+ LED48+ 46 L1 5 33 45 SW1 44 L2 43 SW2 40 L3 41 SW3 38 L4 39 37 SW4 L5 36 SW5 35 L6 34 SW6 31 L7 32 29 SW7 L8 30 SW8 VIN VIN GND GND GND C 47 48 49 50 25 26 27 28 PWM9 PWM10 PWM11 PWM12 PWM45 PWM46 PWM47 PWM48 23 OPENLED 24 SHDN PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 PWM8 PWM9 PWM10 PWM11 PWM12 PWM13 PWM14 PWM15 PWM16 U3 LT3595AEUHH OPENLED VCC SHDN RSET L16 SW16 L15 SW15 L14 SW14 L13 SW13 L12 SW12 L11 SW11 L10 SW10 1 2 3 4 7 6 9 8 10 11 12 13 16 15 L9 14 42 57 C 19 20 21 22 53 54 55 56 VCC 52 51 R57 49.9k SW9 18 PWM33 PWM34 PWM35 PWM36 PWM5 PWM6 PWM7 PWM8 30mA C86 10uF 10V 17 LED33+ LED34+ LED35+ LED36+ LED5+ LED6+ LED7+ LED8+ B L48 100uH L47 100uH L46 100uH L45 100uH L44 100uH L43 100uH L42 100uH B L41 100uH LED8LED7LED6LED5LED36LED35LED34LED33- VIN C87 0.47uF 50V C88 0.47uF 50V C89 0.47uF 50V C90 0.47uF 50V C91 0.47uF 50V C92 0.47uF 50V CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 C93 0.47uF 50V C94 0.47uF 50V APPROVALS PCB DES. JW APP ENG. KEITH S. TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 48-CHANNEL LED DRIVER WITH PWM GENERATOR AND SERIAL INTERFACE SIZE SCALE = NONE 2 IC NO. N/A LT8500EUHH / LT3595AEUHH DEMO CIRCUIT 1552A DATE: Wednesday, August 03, 2011 SHEET 4 1 REV. 3 OF 5 A 5 4 3 2 R68 OPT LDI-RTN R61 OPT 0402 SDO-RTN R69 0 0402 SDO-THRU 1 LDI-THRU 0402 LDI-NEXT R62 0 0402 R71 0 D SCKO-RTN IN D OUT 0402 P3 P4 1 3 5 7 9 11 13 15 17 19 1 2 PWMCK-LAST 1 R66 24.9k 1% 0402 PVIN 40V 5 OUT GND SET VCC A2 Y2 LTC1799CS5 R72 OPT 2 SCKO-THRU 6 5 VCC A1 VCC GND Y2 A2 C98 OPT NC7WZ17P6X VIN TSW-110-07-L-D 1 SCKO-LAST 6 2 5 VCC 3 Y1 A1 VCC GND 4 Y2 A2 C99 OPT NC7WZ17P6X 1 LDI-LAST C 2 3 SDO-LAST PWM40 PWM39 28 PWM46 27 PWM47 26 PWM48 25 PWM41 24 PWM42 23 B PWM43 22 PWM44 21 PWM37 20 PWM38 19 PWM39 18 PWM18 PWM17 17 16 PWM20 PWM19 15 PWM29 13 PWM31 PWM30 12 11 PWM25 9 8 7 57 PWM26 PWM38 PWM27 PWM3 PWM28 PWM37 PWM2 0402 29 PWM45 31 30 PWM36 PWM35 33 32 PWM34 PWM33 SDO 34 OPENLED SCKI 35 SCKO 36 SDO SCKI PWMCK 38 SCKO SDI 39 SDI PWMCK LDIB 40 42 PWM8 LDIBLANK 43 44 45 PWM44 PWM21 PWM2 56 PWM43 PWM4 6 55 PWM42 PWM13 5 PWM3 PWM7 54 PWM22 PWM4 PWM14 4 PWM13 53 PWM6 52 PWM5 PWM14 U4 LT8500EUHH PWM15 PWM23 51 PWM41 PWM24 PWM15 PWM47 PWM16 3 50 PWM46 PWM48 PWM1 PWM16 C97 1uF 6.3V OPENLED PWM33 PWM34 PWM35 PWM36 PWM45 PWM9 2 49 PWM10 GND PWM9 PWM11 1 PWM10 PWM12 46 PWM8 PWM7 PWM6 PWM5 PWM12 41 C96 10uF 10V 48 R64 OPT 2 4 6 8 10 12 14 16 18 20 U7 OPT Y1 4 47 VCC 4 U6 OPT 0402 VCC PWM11 5 2 4 6 8 10 12 14 16 18 20 4 DIV 1 2 4 3 4 6 5 6 8 7 8 TSW-104-07-L-D B Y1 GND 1 3 5 7 9 11 13 15 17 19 0402 37 1 3 5 7 3 V+ A1 6 NC7WZ17P6X PVIN P2 C 2 R65 0 14 C95 1uF 3 U8 VCC TSW-110-07-L-D PVIN 1 3 5 7 9 11 13 15 17 19 U5 VCC 1 3 5 7 9 11 13 15 17 19 PWM32 VIN 2 4 6 8 10 12 14 16 18 20 10 2 4 6 8 10 12 14 16 18 20 PWM1 PWM24 PWM23 PWM22 PWM21 PWM28 PWM27 PWM26 PWM25 PWM40 PWM17 PWM18 PWM19 PWM20 PWM29 PWM30 PWM31 PWM32 CUSTOMER NOTICE A LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. APPROVALS PCB DES. JW APP ENG. KEITH S. TECHNOLOGY TITLE: SCHEMATIC 48-CHANNEL LED DRIVER WITH PWM GENERATOR AND SERIAL INTERFACE SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only N/A SCALE = NONE 2 DATE: IC NO. LT8500EUHH / LT3595AEUHH DEMO CIRCUIT 1552A Wednesday, August 03, 2011 SHEET 5 1 REV. 3 OF 5 A