DEMO MANUAL DC1552A LT8500/LT3595A 48-Channel LED Driver with PWM Generator and Serial Interface DESCRIPTION This demonstration circuit showcases the LT8500, a 48-channel LED driver with a PWM generator and serial interface. It operates from a 30V to 45V input power supply and drives 48 channels of LED strings at 30mA and up to 32V each, although it can be adjusted for 50mA per string. The LT8500 drives 48 PWM channels that are tied directly to the PWM inputs of the three separate LT3595As. The LT3595A is a 16-channel step-down LED driver that can operate up to 45V input and up to 50mA per channel. The input to the LT8500 is a serial interface that can run up to 50MHz. The DC1552A has both an input and output connector and can be cascaded in a chain of two or more while being driven from a single serial interface. DC1552A is assembled as a solo 48-channel LED driver, but with a few simple modifications, it can be turned into one of the elements in a cascaded chain of DC1552As. The LT8500 is a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4096-step) PWM register and a 6-bit (64-step) 50% correction register. All controls are programmable via a simple serial data interface. Three banks of 16-channels each can be configured such that they operate 120 degrees out-of-phase with each other. The LT8500 features two diagnostic information flags: synchronization error and open LED. The flags are sent, with additional state information, on the serial data interface during status read back. The 50MHz cascadable serial data interface includes buffering and skew-balancing, making the chip suitable for PWM intensive applications such as large screen LCD dynamic backlighting and mono-, multiand full-color LED displays. The LT8500 is also ideally suited to control three LT3595A LED drivers. The LT3990 is a small 350mA step-down regulator with integrated power switch and diodes that operates up to 62VIN. Its 3mm x 3mm 16 pin MSOP and integrated components are a good housekeeping power supply to be used for 3.3V power on the LT8500 and it's surrounding logic buffers. The LT8500, LT3595A, and LT3990 data sheets give complete descriptions of the parts, operation and applications information. The data sheets must be read in conjunction with this demo manual for DC1552A. The LT8500 and LT3595A are both assembled in 56 pin (5mm x 9mm x 0.75mm) QFN packages. Proper board layout is essential for both maximum thermal performance and signal noise immunity. See the layout considerations sections in the data sheets for more details. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. dc1552af 1 DEMO MANUAL DC1552A QUICK START PROCEDURE Demonstration circuit 1552A is easy to set up to evaluate the performance of the LT8500 and LT3595A. Follow the procedure for testing a single DC1552A without chaining multiple boards together. 3. With power off, connect the PVIN power supply to the PVIN and GND connection on P2. NOTE: Make sure that the PVIN DC input voltage does not exceed 45V. A hot-plugged input above 40V can result in damage to the IC with input voltage ringing. 5. Begin sending and receiving serial data from the serial interface. 1. Connect a panel of LEDs to the output connector P1 of DC1552A. The LED strings should be between 2 LEDs per string up to about 32V of LEDs per string. There is room for 48 strings of LEDs to be connected to a single DC1552A. 2. Connect the serial data interface to connector P3. 4. Turn the PVIN power supply on. 6. Observe the LED string running at the programmed LED current and the patterns on the LED panel. In order to tie multiple DC1552A LED drivers together in a chain, follow the recommended component setup in Table 1. Repeat the Quick-Start Procedure, but connect the serial output of one DC1552A PCB to the serial input of the next in the chain with a cable from the P4 output on the PCB to the P3 input of the next PCB before power-up. HARDWARE SETUP Up to 45V Input Supply Solo Serial Data Interface 48 Pixel LED panel 30mA per pixel optimized for 8V-32V LED per pixel Figure 1. Typical Hardware Setup for Testing a Single DC1552A as a 48 Pixel LED Driver dc1552af 2 DEMO MANUAL DC1552A HARDWARE SETUP DC1552A Solo (as Assembled without Chaining) the pwm clock signal. The LTC1799 is placed on the solo or first cascaded PCB, but does not have to be present on ensuing PCBs in a chain. Output signals and serial data output is returned to the serial interface directly from the solo PCB as assembled. DC1552A is assembled as a solo PCB. It is setup to be run with a serial interface and not cascaded in a chain without making a few resistor changes. When setup as solo or the first element in a chain, a clock needs to be provided for Up to 45V Input Supply Last in Chain Chain Element First in Chain Serial Data Interface 48 Pixel LED panel 48 Pixel LED panel 48 Pixel LED panel 30mA per pixel 30mA per pixel 30mA per pixel optimized for 8V-32V LED per pixel optimized for 8V-32V LED per pixel optimized for 8V-32V LED per pixel Figure 2. Hardware Setup for Testing the DC1552A in a Chain for Driving 144 Pixels of LEDs DC1552A Cascaded in Chain If more than one DC1552A is needed for a cascaded chain, the PCBs can be tied together. The main power can be derived from a single input since the 40V power is passed from one DC1552A to another next to the serial connection. Alterations to several components should be made to DC1552A to change the PCB from solo setup as assembled to a chain setup. A different set of changes should be made to change the PCB from solo to first in chain, last in chain, or to an element in the chain that is not first or last. To change DC1552A from solo (as assembled) to first in chain, last in chain or a cascaded chain element, please follow the recommendations in the table below. The first in chain must have the PWM clock to be provided for all of the PCBs down the chain. The last element in the chain must take the output data and send it back to the previous PCB. Table 1. Recommended Component Changes for Chaining Multiple DC1552As Together U8, R65, R66, C95 R61, R68 R62, R69 U5, C97 R64 U6, C98, R72 R71 U7, C99 Solo (as Assembled) LTC1799, 0, 24.9k, 1F OPT 0 NC7WZ17P6X, 1F OPT OPT First in Chain LTC1799, 0, 24.9k, 1F 0 OPT NC7WZ17P6X, 1F OPT NC7WZ17P6X, 1F, 0 OPT NC7WZ17P6X, 1F 0 Chain Element OPT 0 OPT NC7WZ17P6X, 1F 0 NC7WZ17P6X, 1F, 0 OPT NC7WZ17P6X, 1F Last in Chain OPT OPT 0 NC7WZ17P6X, 1F 0 OPT 0 OPT OPT OPT = Optional, do not stuff dc1552af 3 DEMO MANUAL DC1552A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 7 C1-C7 CAP., X7R, 0.33F, 50V, 10%, 0805 MURATA, GRM219R71H334KA88D 2 78 C8-C25, C32-C39, C41-C58, C60-C85, C87-C94 CAP., X7R, 0.47F, 50V, 10%, 0805 MURATA, GRM21BR71H474KA88L 3 4 C26, C59, C86, C96 CAP., X7R, 10F, 10V, 10%, 0805 MURATA, GRM21BR71A106KE51L 4 1 C27 CAP., X5R, 0.22F, 16V, 10%, 0603 TAIYO YUDEN, EMK107BJ224KA-T 5 1 C28 CAP., C0G, 22pF, 25V, 10%, 0402 AVX, 04023A220KAT2A 6 1 C29 CAP., X7R, 22F, 6.3V, 20%, 0805 TAIYO YUDEN, JDK212BJ226MD-T 7 1 C95 CAP., X7R, 1F, 10V, 10%, 0805 MURATA, GRM21BR71A105KA01L 8 1 C97 CAP., X7R, 1F, 6.3V, 20%, 0603 AVX, 06036C105MAT2A 9 0 C98, C99 (OPT) CAP., 0603 10 1 L49 IND. PWR, 10H, L-LPO3310 COILCRAFT, LPO3310-103MLC 11 48 L1-L48 IND., 100H, 1212 MURATA, LQH3NPN101MG0L 12 1 L50 IND., 33H COILCRAFT, LPS6225-333ML 13 1 P1 HEADER, 2X50, 0.100" SAMTEC, TSW-150-07-L-D 14 1 P2 HEADER, 2X4, 0.100" SAMTEC, TSW-104-07-L-D 15 2 P3, P4 HEADER, 2X10, 0.100" SAMTEC, TSW-110-07-L-D 16 1 R1 RES., 4.99, 1/8W, 1%, 0805 VISHAY, CRCW08054R99FNEA 17 1 R2 RES., 1.00M, 1/16W, 0402, 1% VISHAY, CRCW04021M00FKED 18 1 R3 RES., 576k, 1/16W, 1%, 0402 VISHAY, CRCW0402576KFKED 19 1 R5 RES., 374k, 1/16W, 0402, 1% VISHAY, CRCW0402374KFKED VISHAY, CRCW060349K9FKEA 20 3 R18, R39, R57 RES., 49.9k, 1/10W, 1%, 0603 21 0 R61, R64, R68, R72 (OPT) RES., 0603 22 1 R19 RES., 33k, 1/10W, 1%, 0603 23 4 R62, R65, R69, R71 RES., 0, 1/10W, 0402 VISHAY, CRCW04020000Z0EA 24 1 R66 RES., 24.9k, 1/16W, 1%, 0402 VISHAY, CRCW040224K9FKED VISHAY, CRCW060333K0FKEA 25 3 U1-U3 IC., LT3595AEUHH, QFN56UHH-5X9 LINEAR TECH., LT3595AEUHH 26 1 U4 IC., LT8500EUHH, QFN56UHH-5X9 LINEAR TECH., LT8500EUHH 27 1 U5 IC., TinyLogic UHS Dual Buffer, SC70-6 FAIRCHILD SEMI., NC7WZ17P6X 28 0 U6, U7 (OPT) IC., TinyLogic UHS Dual Buffer, SC70-6 29 1 U8 IC., LTC1799CS5, SOT23-5 30 1 U9 IC., LT3990EMSE, MSE16 (1rl.+2 tubes) LINEAR TECH., LT3990EMSE 31 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1552A 32 1 STENCIL TOP SIDE ONLY STENCIL 1552A LINEAR TECH., LTC1799CS5 dc1552af 4 A B C /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' 5 3 /('72/(' 83729 76:/' 4 4 1& 1& 1& 1& 1& 1& 3* (189/2 9,1 8 /7(06( 57 )% )% %' %2267 6: 5 N N+] & X) 9 / X+ /360/ BB (&2 2 5 N 5 0 &86720(5127,&( 3 7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1' 6833/,(')2586(:,7+/,1($57(&+12/2*<3$576 6&$/( 121( .(,7+6 -: $33529$/6 '$7( 0F&DUWK\%OYG 0LOSLWDV&$ 3KRQH ZZZOLQHDUFRP )D[ /7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\ & X) 9 .(,7+6 $33529(' 1 '$7( 1$ 6,=( 2 1 6+((7 /7(8++/7$(8++ '(02&,5&8,7$ :HGQHVGD\$XJXVW ,&12 2) 5(9 &+$11(//(''5,9(5:,7+3:0*(1(5$725$1'6(5,$/,17(5)$&( 7,7/( 6&+(0$7,& & S) 9&& 352'8&7,21 '(6&5,37,21 5(9,6,21+,6725< TECHNOLOGY 5(9 $//5(6,67256$5($//&$3$&,725$5( 127(681/(6627+(5:,6(63(&,),(' 9,1 /,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$ &,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216 +2:(9(5,75(0$,167+(&86720(5 65(63216,%,/,7<72 3&%'(6 9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/ $33(1* $33/,&$7,21&20321(1768%67,787,21$1'35,17(' &,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7 3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5 7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&( /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' 3 *1' *1' D 5 A B C D DEMO MANUAL DC1552A SCHEMATIC DIAGRAM dc1552af 5 6 A B C D 6+'1 23(1/(' 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 5 5 / X+ 5 && X) 9 39,1 & X) 9 9&& && X) 9 5 N 4 / 4 9,1 / 6+'1 23(1/(' 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 9,1 9,1 9,1 & X) 9 / / & X) 9 6: 6: / X+ / / / X+ & X) 9 / X+ 6: 6: / X+ & X) 9 / 6: & X) 9 / X+ / & X) 9 / / X+ 6: / & X) 9 3 7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1' 6833/,(')2586(:,7+/,1($57(&+12/2*<3$576 .(,7+6 $33(1* 2 6&$/( 121( -: $33529$/6 & X) 9 / / / X+ 6: 6: / X+ & X) 9 2 3&%'(6 / / X+ 6: / / X+ & X) 9 6: &86720(5127,&( 6: / X+ & X) 9 /,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$ &,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216 +2:(9(5,75(0$,167+(&86720(5 65(63216,%,/,7<72 9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/ $33/,&$7,21&20321(1768%67,787,21$1'35,17(' &,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7 3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5 7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&( & X) 9 6: / X+ & X) 9 8 /7$(8++ / / X+ 6: / / X+ 6: 9,1 & X) 9 3 30m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dc1552af A B C D 6+'1 23(1/(' 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 5 5 9,1 && X) 9 4 9,1 & X) 9 6: / / X+ & X) 9 3 & X) 9 / / X+ 6: & X) 9 / / / X+ 6: 6: &86720(5127,&( & X) 9 / X+ / / / X+ & X) 9 3 7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1' 6833/,(')2586(:,7+/,1($57(&+12/2*<3$576 -: .(,7+6 $33(1* 2 30mA N 5 & X) 9 TECHNOLOGY 9&& /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' /(' 0F&DUWK\%OYG 0LOSLWDV&$ 3KRQH ZZZOLQHDUFRP )D[ /7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\ 1 '$7( 1$ 6,=( 1 6+((7 /7(8++/7$(8++ '(02&,5&8,7$ :HGQHVGD\$XJXVW ,&12 2) 5(9 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7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&( 6: / X+ & X) 9 6: 8 /7$(8++ / X+ 6: / / X+ & X) 9 6: 9,1 / & X) 9 6: / & X) 9 / 6: / X+ / / X+ & X) 9 / X+ 6: 6: / X+ & X) 9 / 6+'1 23(1/(' 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 9,1 9,1 / 4 A B C D DEMO MANUAL DC1552A SCHEMATIC DIAGRAM dc1552af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C 39,1 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 9,1 3 ,1 5 76:/' 3 39,19 76:/' 39,1 & X) 9&& 5 N ',9 287 /7&&6 6(7 *1' 9 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 8 4 3:0&./$67 6&.2571 D 5 5 9&& 5 8 /7(8++ 6'27+58 /',571 9&& 3 < < 9&& < 9&& < 8 237 $ *1' $ 1&:=3; $ *1' $ 8 5 7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1' 6833/,(')2586(:,7+/,1($57(&+12/2*<3$576 /,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$ &,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216 +2:(9(5,75(0$,167+(&86720(5 65(63216,%,/,7<72 9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/ $33/,&$7,21&20321(1768%67,787,21$1'35,17(' &,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7 3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5 7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&( 9&& 9,1 .(,7+6 $33(1* 2 6&$/( 121( -: $33529$/6 2 3&%'(6 5 237 /',1(;7 /',7+58 6&.2/$67 & X) 9 9&& 5 237 &86720(5127,&( 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 & 237 1&:=3; 6&.27+58 & X) 9 5 237 5 237 6'2571 6'2 3 4 3:0 3:0 3:0 3:0 3:0 *1' /',% 3:0 3:0 6', 3:0 3:0 3:0&. 3:0 3:0 6&.2 3:0 3:0 3:0 /',%/$1. 6&., 3:0 6', 3:0&. 6&.2 9&& 6&., 3:0 6'2 3:0 23(1/(' 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 5 < 9&& < 8 237 $ $ *1' 0F&DUWK\%OYG 0LOSLWDV&$ 3KRQH ZZZOLQHDUFRP )D[ /7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\ 6'2/$67 /',/$67 '$7( 1$ 6,=( 1 6+((7 /7(8++/7$(8++ '(02&,5&8,7$ :HGQHVGD\$XJXVW ,&12 2) 5(9 &+$11(//(''5,9(5:,7+3:0*(1(5$725$1'6(5,$/,17(5)$&( 7,7/( 6&+(0$7,& TECHNOLOGY 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 3:0 23(1/(' 3:0 3:0 3:0 3:0 3:0 & 237 1&:=3; 3 287 76:/' 1 A B C D DEMO MANUAL DC1552A SCHEMATIC DIAGRAM dc1552af 9 DEMO MANUAL DC1552A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation dc1552af 10 Linear Technology Corporation LT 1211 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2011