DEMO MANUAL DC1608A
LT3745
16-Channel LED Driver
Description
Demonstration circuit 1608A features the LT
®
3745,
16-channel 50mA LED driver with buck controller and
serial interface. Each channel has an individually adjustable
12-bit (4096-step) grayscale PWM dimming control and
a 6-bit (64-step) dot correction current adjustment. Both
dimming control and current adjustment are accessible
via a 30MHz cascadable serial data interface. Individual
open/short LED and overtemperature flags are sent back
during status read back.
Three LT3745’s are connected in series to control 16 RGB
LEDs stuffed on the demo board. Each IC drives a separate
color. The evaluation software installed in a host computer
communicates with the DC1608A via the interface board
DC590B, an USB serial controller.
The LT3745 data sheet gives a complete description of
the part, its operation and application information. The
datasheet must be read in conjunction with this quick start
guide for working on or modifying the demo circuit 1608A.
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 and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
perForMAnce sUMMArY
SYMBOL
V
IN
V
OUT-R
V
OUT-G
V
OUT-B
f
S
PARAMETER
Input Supply Range
Precharge Voltage (Red)
Precharge Voltage (Green)
Precharge Voltage (Blue)
Free-Running Switching Frequency
Specifications are at T
A
= 25°C.
CONDITIONS
MIN
9
3.4
4.2
4.2
400
TYP
MAX
40
UNITS
V
V
V
V
kHz
dc1608af
1
DEMO MANUAL DC1608A
qUick stArt proceDUre
Demonstration circuit 1608A is easy to set up to evalu-
ate the performance of the LT3745. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
1. Install the QuikEval™ System software on the host
computer. The software can be downloaded from
http://
www.linear.com/designtools/software/quick_eval.jsp
2. Install Microsoft .NET framework. The software can be
downloaded from
http://www.microsoft.com/NET/
3. Copy LT3745Release folder to the host computer. Run
vcredist_x86.exe. You may need to restart the computer.
4. Place jumpers in the following positions:
JP1
On
JP2
TO PWMCK
5. Connect the demo board to DC590B as shown in
Figure 1.
6. With power off, connect the input power supply to V
IN
and GND.
7. Apply 9V to 40V to DC1608A input.
8. Run LTcolorLEDarray.exe in the LT3745Release folder.
9. The initial start-up screen appears, at this point, none of
the LEDs should light up. Proceed with board evaluation.
Figure 1. Proper Measurement Equipment Setup
dc1608af
2
DEMO MANUAL DC1608A
operAting the control screen
Figure 2 is the initial start-up screen that appears when
the program is launched.
1. Send Data Frame to Chip.
Double-click one of the black squares in the “LED Colors”
grid. The standard color selector dialog box appears.
Select a color and click “OK.” Or select the LED number
in the “LED Configuration” grid, adjust the LED color
by moving the sliding bars.
Click the command button labeled “Send Data Frame
to Chip.” Verify that the LEDs light up in corresponding
colors.
2. Play Pattern File.
Click the “Browse” button and pick the file “test”. Click
the command button labeled “Play Pattern File.” Verify
that all 16 RGB LEDs light up in red, green, blue and
white in sequence.
Check the “Auto-Update Data/Loop File” option. Click
the command button labeled “Play Pattern File.” Click
the “stop” button at any time to stop.
3. Append Data Frame to Pattern File.
Create a blank text file. Click the “Browse” button and
pick this new file. Create and then add the first data
frame to the file by clicking the “Append Data Frame
to Pattern File” button. Create the second data frame
and add it to the file by clicking the “Append” button.
Repeat until all the data frames are added to the file.
Click the command button labeled “Play Pattern File.”
Figure 2. GUI Control Panel Start-Up Screen
dc1608af
3
DEMO MANUAL DC1608A
pArts list
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
10
21
22
23
24
25
26
27
28
29
30
1
2
Hardware
1
2
3
4
5
6
7
2
1
0
2
14
2
4
JP1, JP2
J1
J2
TP1, TP2
TP3, TP41, TP54-TP59, TP75,
TP77, TP79, TP81, TP83, TP84
JP1, JP2
Header, 3-Pin, 2mm
Header, 2×7 2mm
Header, 2×7 2mm Option
Turrets
Turrets
Shunt, 2mm
Standoff, Snap-On
Samtec TMM-103-02-L-S
Molex 87831-1420
Molex 87831-1420 Option
Mill-Max 2501-2-00-80-00-00-07-0
Mill-Max 2308-2-00-80-00-00-07-0
Samtec 2SN-BK-G
Keystone 8831
dc1608af
QUANTITY
3
3
3
3
1
1
2
3
3
16
3
3
3
1
1
3
4
1
3
3
1
1
3
2
1
3
3
1
1
1
1
0
REFERENCE-DESCRIPTION
C1, C9, C12
C2, C10, C13
C3, C15, C16
C4, C17, C18
C5
C6
C7, C19
C8, C11, C14
D1, D2, D3
LED00-LED15
L1, L2, L3
Q1, Q2, Q3
R1, R17, R18
R2
R3
R4, R19, R20
R5, R7, R21, R23
R6
R8, R25, R26
R9, R27, R28
R10
R13
R14, R15, R16
R22, R24
R29
R31, R32, R33
U1, U2, U3
U4
U5
U6
CIN1
R30
DESCRIPTION
Capacitor, 1206, 2.2µF 10%, 50V, X5R
,
Capacitor, 0603, 0.47µF 10%, 16V, X7R
,
Capacitor, 0603, 10nF 10%, 50V, X7R
,
Capacitor, 0603, 10µF 10%, 6.3V, X5R
,
Capacitor, 0805 1µF 10%, 50V, X7R
,
Capacitor, 0603, 1µF 10%, 16V, X7R
,
Capacitor, 0603, 0.1µF 10%, 50V, X7R
,
Capacitor, 7343 220µF 20%, 6.3V, POSCAP
,
Diode, Rectifier, Barrier, Schottky, 1A
LED, Top, 6-Lead
Inductor, 15µH
XSTR, P-channel MOSFET
Resistor, 1206, 0.05Ω, 1%, 1/8W
Resistor, 0603, 499k, 1%, 1/10W
Resistor, 0603, 100k, 1%, 1/10W
Resistor, 0603, 133k, 1%, 1/10W
Resistor, 0603, 10k, 1%, 1/10W
Resistor, 0603, 18.2k, 1%, 1/10W
Resistor, 0603, 150k, 1%, 1/10W
Resistor, 0603, 86.6k, 1%, 1/10W
Resistor, 0603, 20.5k, 1%, 1/10W
Resistor, 0603, 12.4k, 1%, 1/10W
Resistor, 0603, 5.1k, 1%, 1/10W
Resistor, 0603, 24.9k, 1%, 1/10W
Resistor, 0603, 23.2k, 1%,, 1/10W
Resistor, 0603, 5.1Ω, 1%, 1/10W
IC, 16-Channel LED Driver
IC, LT3010EMS8E
IC, LTC1799CS5
IC, 24LC025-I/ST
Capacitor, 22µF 20%, 50V
,
Resistor, 0603, 0Ω, Jumper Option
MANUFACTURER’S PART NUMBER
Murata GRM31CR71H225KA88L
TDK C1608X7R1C474KT
AVX 06035C103KAT2A
Murata GRM188R60J106ME47D
Murata GRM21BR71H105KA12L
TDK C1608X7R1C105K
TDK C1608X7R1H104K
SANYO POSCAP 6TPE220ML
Diodes Inc. DFLS160
OSRAM LRTB-G6TG
Würth 744778115
Vishay Si9407BDY
SUSUMU RL32R-R050-F
Vishay CRCW0603499KFKEA
Vishay CRCW0603100KFKEA
Vishay CRCW0603133KFKEA
Vishay CRCW060310K0FKED
Vishay CRCW060318K2FKEA
Vishay CRCW0603150KFKEA
Vishay CRCW060386K6FKEA
Vishay CRCW060320K5FKED
Vishay CRCW060312K4FKED
Vishay CRCW06035K10FKED
Vishay CRCW060324K9FKED
Vishay CRCW060323K2FKED
Vishay CRCW06035R10FNEA
Linear Technology LT3745EUJ
Linear Technology LT3010EMS8E
Linear Technology LTC1799CS5
Microchip Tech. 24LC025-I/ST
Sun Elect. 50CE22BS
Vishay CRCW06030000Z0ED Option
Required Circuit Components
Additional Demo Board Circuit Components
4
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