Linear Technology DC1552A Guide de configuration rapide

dc1552af

DEMO MANUAL DC1552A

DESCRIPTION

LT8500/LT3595A

48-Channel LED Driver with PWM

Generator and Serial Interface

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 sup-

ply 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) genera-

tor 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 stateinformation, on theserial data interface

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.

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-, multi-

and 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 ×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.

TheLT8500,LT3595A,andLT3990datasheetsgivecomplete

descriptions of the parts, operation and applications infor-

mation. 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 ×9mm ×0.75mm)

QFN packages. Proper board layout is essential for both

maximum thermal performance and signal noiseimmunity.

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

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dc1552af

DEMO MANUAL DC1552A

HARDWARE SETUP

QUICK START PROCEDURE

Figure 1. Typical Hardware Setup for Testing a Single DC1552A as a 48 Pixel LED Driver

48 Pixel LED panel

30mA per pixel

optimized for 8V-32V LED per pixel

Serial

Data

Interface

Up to 45V

Input

Supply

Solo

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.

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.

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.

3. With power off, connect the PVIN power supply to the

PVIN and GND connection on P2.

4. Turn the PVIN power supply on.

5. Begin sending and receiving serial data from the serial

interface.

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.

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dc1552af

DEMO MANUAL DC1552A

DC1552A Solo (as Assembled without Chaining)

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

HARDWARE SETUP

48 Pixel LED panel

30mA per pixel

optimized for 8V-32V LED

per pixel

Up to 45V

Input Supply

48 Pixel LED panel

30mA per pixel

optimized for 8V-32V LED

per pixel

48 Pixel LED panel

30mA per pixel

optimized for 8V-32V LED

per pixel

Serial

Data

Interface

First in ChainElementniahCChainnitsaL

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, 0Ω, 24.9kΩ, 1μF OPT 0Ω NC7WZ17P6X, 1μF OPT OPT 0Ω OPT

First in Chain LTC1799, 0Ω, 24.9kΩ, 1μF 0Ω OPT NC7WZ17P6X, 1μF OPT NC7WZ17P6X, 1μF, 0Ω OPT NC7WZ17P6X, 1μF

Chain Element OPT 0Ω OPT NC7WZ17P6X, 1μF 0Ω NC7WZ17P6X, 1μF, 0Ω OPT NC7WZ17P6X, 1μF

Last in Chain OPT OPT 0Ω NC7WZ17P6X, 1μF 0Ω OPT 0Ω OPT

OPT = Optional, do not stuff

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.

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.

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.

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dc1552af

DEMO MANUAL DC1552A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 7 C1-C7 CAP., X7R, 0.33μF, 50V, 10%, 0805 MURATA, GRM219R71H334KA88D

2 78 C8-C25, C32-C39, C41-C58,

C60-C85, C87-C94

CAP., X7R, 0.47μF, 50V, 10%, 0805 MURATA, GRM21BR71H474KA88L

3 4 C26, C59, C86, C96 CAP., X7R, 10μF, 10V, 10%, 0805 MURATA, GRM21BR71A106KE51L

4 1 C27 CAP., X5R, 0.22μF, 16V, 10%, 0603 TAIYO YUDEN, EMK107BJ224KA-T

5 1 C28 CAP., C0G, 22pF, 25V, 10%, 0402 AVX, 04023A220KAT2A

6 1 C29 CAP., X7R, 22μF, 6.3V, 20%, 0805 TAIYO YUDEN, JDK212BJ226MD-T

7 1 C95 CAP., X7R, 1μF, 10V, 10%, 0805 MURATA, GRM21BR71A105KA01L

8 1 C97 CAP., X7R, 1μF, 6.3V, 20%, 0603 AVX, 06036C105MAT2A

9 0 C98, C99 (OPT) CAP., 0603

10 1 L49 IND. PWR, 10μH, L-LPO3310 COILCRAFT, LPO3310-103MLC

11 48 L1-L48 IND., 100μH, 1212 MURATA, LQH3NPN101MG0L

12 1 L50 IND., 33μH 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., 4.99Ω, 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

20 3 R18, R39, R57 RES., 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA

21 0 R61, R64, R68, R72 (OPT) RES., 0603

22 1 R19 RES., 33k, 1/10W, 1%, 0603 VISHAY, CRCW060333K0FKEA

23 4 R62, R65, R69, R71 RES., 0Ω, 1/10W, 0402 VISHAY, CRCW04020000Z0EA

24 1 R66 RES., 24.9k, 1/16W, 1%, 0402 VISHAY, CRCW040224K9FKED

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 LINEAR TECH., LTC1799CS5

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

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dc1552af

DEMO MANUAL DC1552A

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dc1552af

DEMO MANUAL DC1552A

SCHEMATIC DIAGRAM

D D

C C

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A A

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dc1552af

DEMO MANUAL DC1552A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

9,1

/('

/('

/('

/('

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3:0

3:0

3:0

3:0

6+'1

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

9,1

9&&

6,=(

'$7(

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6+((7 2)

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TECHNOLOGY )D[

0LOSLWDV&$

3KRQH

0F&DUWK\%OYG

/7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\

&86720(5127,&(

/,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$

&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216

+2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72

9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/

$33/,&$7,21&20321(1768%67,787,21$1'35,17('

&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7

3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5

7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(

7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'

6&+(0$7,&

6833/,(')2586(:,7+/,1($57(&+12/2*<3$576

6&$/( 121(

ZZZOLQHDUFRP

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.(,7+6

1$

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:HGQHVGD\$XJXVW

6,=(

'$7(

,&12 5(9

6+((7 2)

7,7/(

$33529$/6

3&%'(6

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TECHNOLOGY )D[

0LOSLWDV&$

3KRQH

0F&DUWK\%OYG

/7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\

&86720(5127,&(

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&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216

+2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72

9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/

$33/,&$7,21&20321(1768%67,787,21$1'35,17('

&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7

3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5

7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(

7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'

6&+(0$7,&

6833/,(')2586(:,7+/,1($57(&+12/2*<3$576

6&$/( 121(

ZZZOLQHDUFRP

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.(,7+6

1$

'(02&,5&8,7$

/7(8++/7$(8++

:HGQHVGD\$XJXVW

6,=(

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6+((7 2)

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TECHNOLOGY )D[

0LOSLWDV&$

3KRQH

0F&DUWK\%OYG

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+2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72

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$33/,&$7,21&20321(1768%67,787,21$1'35,17('

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6&+(0$7,&

6833/,(')2586(:,7+/,1($57(&+12/2*<3$576

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ZZZOLQHDUFRP

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dc1552af

DEMO MANUAL DC1552A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

9,1

3:0

/('

/('

/('

3:0

3:0

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3:0

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3:0

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3:0

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3:0

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3:0

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23(1/('

6+'1

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dc1552af

DEMO MANUAL DC1552A

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 representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

D D

C C

B B

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dc1552af

DEMO MANUAL DC1552A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 1211 • PRINTED IN USA

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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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