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 × 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 × 9mm × 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, 0Ω, 24.9kΩ, 1μF OPT
0Ω
NC7WZ17P6X, 1μF OPT OPT
First in Chain
LTC1799, 0Ω, 24.9kΩ, 1μF 0Ω
OPT
NC7WZ17P6X, 1μF OPT NC7WZ17P6X, 1μF, 0Ω OPT NC7WZ17P6X, 1μF
0Ω
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
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, 0.33μF, 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
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., 0Ω, 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
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DEMO MANUAL DC1552A
SCHEMATIC DIAGRAM
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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.
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DEMONSTRATION BOARD IMPORTANT NOTICE
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