Linear Technology DC2218A Guida rapida alla configurazione

dc2218af

DEMO MANUAL DC2218A

DESCRIPTION

LT3965EFE

8-Switch Matrix LED Dimmer

Demonstration circuit DC2218A is a matrix LED dimmer

system featuring the LT3965 8-switch matrix LED dim-

mer IC. There are 16 500mA LEDs that can be individually

turned on, off, or PWM dimmed with two 8-switch LED

dimmer LT3965 ICs. The two strings of LEDs are driven

with two buck LED driver outputs of the LT3797 triple LED

controller IC. The third channel of the LT3797 serves as a

30V pre-boost voltage regulator to provide a proper input

voltage to the two buck LED driver channels. DC2218A

can be driven from a 9V to 30V input and can survive

transients up to 36V.

A pre-programmed DC2026C Linduino™One demo circuit

is attached to the DC2218A matrix LED dimmer shield to

create a full matrix LED dimmer system. With the Linduino

One attached as an under-shield microcontrollerboard, the

entire system can be powered from either a 9V to 36V lab

power supply or battery connected to the EMIVIN banana

jacks or from a 12V 4A+ AC/DC converter connected to

the J7 barrel jack connector.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Linduino and QuikEval are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

PERFORMANCE SUMMARY

DC2218A can be operated by connecting 12V power to the

input and selecting 7 pre-programmed patterns withrotary

switch S1. When connected to a PC through a USB cable,

an eighth setting of S1 (position 7) allows DC2218A to be

operated with a graphical user interface (GUI).

The LT3965 data sheet gives a complete description of

the part, operation and applications information. The data

sheet must be read in conjunction with this demo manual

for demonstration circuit DC2218A. The LT3965EFE is

assembled in a 28-lead plastic TSSOP (FE) package with

a thermally enhanced ground pad. Proper board layout

is essential for maximum thermal performance. See the

data sheet section Layout Considerations.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2218A

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage (EMIVIN or J7 Barrel Connector) 8 36 V

RTCLK Switching Frequency Set by LTC6900 350 kHz

PWM Dimming Frequency Switching Frequency Divided by 2048 170 Hz

ILED 16 LEDs, 8 LEDs Each LT3965 500 mA

30VOUT LT3797 CH3 Pre-Boost Voltage 30 V

I2C Serial Communications Frequency 400 kHz

Barrel Jack Connector Size (for 12V 4A+ Supply) PJ-002AH Power Jack Connector J7 2.1 mm ID

dc2218af

DEMO MANUAL DC2218A

QUICK START PROCEDURE

How to Operate Pre-Programmed Patterns 0-6 (S1)

Demonstration circuit DC2218A is easy to set up to evalu-

ate the performance of the LT3965 matrix LED dimming

system and its pre-programmed patterns.

NOTE:The included DC2026C Linduino One is pre-

programmed to work with DC2218A. If the .ino code is

mistakenly changed or overwritten, new .ino code must

be uploaded from Linear’s website.

NOTE: An acrylic shield has been assembled over the LEDs

toprotect theuser’s eyes from extremelybright light.Please

make sure that the shield is in place and any necessary

protective eyewear is worn before looking directly at the

bright LEDs and their patterns.

Follow the procedure below:

1. Set the PATTERN SELECT rotary switch S1 to any posi-

tion between 0 and 6. Position 7 is reserved for use

with the GUI (graphical user interface).

2. Connect 12V power to either the EMIVIN and GND

banana jacks or to the J7 2.1mm (inside diameter)

barrel jack.

3. Observe the red LED indicator light (D32). When it

begins ﬂashing, then the board is ready to start up.

4. When the red LED (D32) is ﬂashing, push the Push to

Start button S3.

5. Observe the LED patterns and adjust the speed, bright-

ness and pattern of the LEDs with the manual blue

potentiometer R14.

6. Change the Pattern Select rotary switch to positions

0-6 to observe different patterns.

7. Press the Reset button S2 to start over again.

How to Operate with Graphical User Interface (GUI)

Demonstration circuit DC2218A can be connected with a

PC via USB cable and controlled with a GUI.

NOTE:The included DC2026C Linduino One is pre-

programmed to work with DC2218A and to interface with

the LT3965 GUI. If the .ino code is mistakenly changed

or overwritten, new .ino code must be uploaded from

Linear’s website.

NOTE: An acrylic shield has been assembled over the LEDs

toprotect theuser’s eyes from extremelybright light.Please

make sure that the shield is in place and any necessary

protective eyewear is worn before looking directly at the

bright LEDs and their patterns.

Follow the procedure below:

1. If never done before, download and install QuikEval™

from Linear’s website under design tools and software

at http://www.linear.com/designtools/software/#Data

QuikEval is your link to receiving the latest LT3965 GUI

software and to run the GUI. Installation of QuikEval

properlyinitializes theserialport driveron thecomputer

to work with the Linduino One USB connection.

If QuikEval is already installed, skip step 1, or update

QuikEval to get the LT3965 GUI.

dc2218af

DEMO MANUAL DC2218A

QUICK START PROCEDURE

2. Remove power and the USB cable from the DC2218A

inputs.

3. Turnthe PATTERN SELECTrotaryswitch S1 to position

7 for the GUI.

4. Connect 12V power to either the EMIVIN and GND

banana jacks or to the J7 2.1mm (inside diameter)

barrel jack.

5. Connect a USB cable between a PC and the USB con-

nector on the under-shield DC2026C (which arrives

includedin theDC2218Apackage andpre-programmed

with DC2218A .ino code).

6. Launch the LT3965 GUI from QuikEval.

7. Click Connect to DC2218A to connect to the DC2218A

with the GUI.

8. Observe the GUI program starts at ALL CHANNEL

MODE screen and the LEDs on the PCB are all off.

9. Start creating and testing I2C commands with ALL

CHANNEL MODE, SINGLE CHANNEL MODE, BROAD-

CAST, DIGITAL WRITE, READ REGISTERS, and LED

SETTINGS pages.

NOTE: An LT3965 GUI user guide is posted on the Linear

blog site. It contains the GUI commands and details.

Please contact Linear support for help with the GUI and

User Guide.

dc2218af

DEMO MANUAL DC2218A

QUICK START PROCEDURE

Figure 1. DC2218A Test Setup Photo

dc2218af

DEMO MANUAL DC2218A

S1 PATTERN SELECT

ROTARY SWITCH

S2 RESET BUTTON

TO RESET MICRO

S3 PUSH TO START

WHEN RED LED D32

IS FLASHING

USB CABLE CONNECTION

UNDER PCB FOR GUI

2.1mm INSIDE

DIAMETER

BARREL JACK J7

12V DC

OKAY TO NOT CONNECT

THESE TURRETS

BANANA JACKS

DC2026C LINDUINO ONE

PRE-PROGRAMMED AND

INSTALLED UNDER DC2218A

R14 POTENTIOMETER

MANUAL INTERACTION

WITH S1 PATTERNS 0-6

–

QUICK START PROCEDURE

Figure 2. DC2218A Top Silkscreen and Component Reference Drawing

dc2218af

DEMO MANUAL DC2218A

PWM ON, CONNECT LED STRING

START PUSH BUTTON

STARTS WITH ALL LEDS OFF AND USES PUSH BUTTON START

PROGRAMMED IN EMBEDDED C++ AND PRE-LOADED ON DC2026C (LINDUINO ONE)

LT3797 STARTUP (PWM LOW)

CHARGE PUMP LT3965 ON

SCM WRITES TO ALL CHANNELS – TURN LEDS OFF, 1 LED OPEN AND SHORT

CHECK

ROTARY SWITCH

POSITION

GUI

Fade Wave

INTERACTIVE

KNOB

Side Bend Steer

Side-to-Side Steer

High Beam Blank

PWM All 16

LEDs are OFF, LT3965 SWITCHES are ON.

WAIT FOR Blinking indicates ready to start.

CONNECT POWER

PRESS RESET

WAIT FOR ALERT FLAG

LINDUINO STARTUP

PULL PWM OFF

MAIN

LOOP

Wave

Comet

PRE-PROGRAMMED PATTERNS

Figure 3. DC2218A Attached Linduino One Pre-Programmed Software Flow-Chart

S1 Pattern Select Position

0. Comet:A comet of light runs around the sixteen LEDs

changing PWM dimming brightness quickly increasing

and decreasing at rates that look like a ball of fire zipping

around the LEDs. The interactive potentiometer controls

the speed of the comet.

1. Wave:A wave of light from right to left and from left to

right changing PWM dimming brightness quickly increas-

ing and decreasing at rates that look like a wave running

from one side of the LEDs to the other

. The interactive

potentiometer controls the speed of the wave.

2. Side-to-Side Steer:Center headlight LEDs stay on to

face directly forward while the right and left side LEDs

turn on with brightness proportional to the amount that

the steering wheel (interactive potentiometer) is turned.

3. High Beam Blank:While the low beam Is on 100%

brightness, the sections of the high beam turn OFF.

Although the blank spots would be controlled by a so-

phisticated camera detecting an object in front of a car

to determine which high beam LEDs to turn off or dim,

the section on DC2218A is controlled by turning the

interactive potentiometer.

4. Side Bend Steer:All sixteen LEDs adjust PWM dim-

ming duty cycle and brightness based upon the position

of the steering wheel (interactive potentiometer). This

pattern represents a light that bends around the side of

a car, projecting a turning headlight pattern that is linked

to the steering wheel.

5. PWM All 16:All sixteen LEDs have the same PWM

dimming and brightness level that is set by the interactive

potentiometer. They range from OFF to ON In increments

of 1/256 PWM dimming.

6.Fade Wave:Usingthe PWM dim WITH FADE commands,

a wave of light is created by fading the LED brightnesses

up and down. WITH FADE option uses the logarithmic fade

function of the LT3965 and allows the brightness to fade

from low to high or from high to low with a single I2C bus

command. This pattern has low bus traffic.

7. GUI:GRAPHICAL USER INTERFACE position setting –

Use this position when connecting to the GUI. See details

above for downloading and connecting to the GUI via the

USB cable connection of DC2026C.

dc2218af

DEMO MANUAL DC2218A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

LT3965 Matrix LED Dimmer Circuit Components

1 2 C1, C2 CAP., 0.1µF, X7R, 50V, 10%, 0402 MURATA, GRM155R71H104KE14D

2 2 C3, C6 CAP., 1µF, X7R, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

3 0 C42-C59(OPT) CAP., OPTION, 0402

4 2 D4, D5 SCHOTTKY, RECTIFIER, 60V, 1A, SOD-123F NXP., PMEG6010CEH, 115

5 2 D12, D13 SCHOTTKY, RECTIFIER, 40V, 1A, SOD-123F NXP., PMEG4010CEH, 115

6 16 D15-D30 DIODE, PMEG4010CEJ SOD-323 NXP., PMEG4010CEJ, 115

7 2 Q4, Q5 TRANSISTOR, SOT-23 DIODES INC., FMMT593TA

8 2 R1, R2 RES., 49.9k, 1/10W, 1% 0603 VISHAY, CRCW060349K9FKEA

9 2 R3, R5 RES., 9.09k, 1/10W, 1%, 0603 VISHAY, CRCW06039K09FKEA

10 7 R4, R6, R7, R8, R18, R19, R83 RES., 10k, 1/16W, 1% 0402 VISHAY, CRCW040210K0FKED

11 2 R44, R47 RES., 1k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA

12 2 U1, U2 I.C. LT3965EFE TSSOP28 LINEAR TECH., LT3965EFE#PBF

LT3797 Boost-then-Dual-Buck LED Driver Circuit Components

1 4 C4, C5, C12, C17 CAP., 0.1µF, X7R, 100V, 10%, 0603 MURATA, GRM188R72A104KA35D

2 1 C9 CAP., 22nF, X7R, 25V, 10%, 0402 MURATA, GRM155R71E223KA61D

3 2 C19, C37 CAP., 2200pF, X7R, 25V, 10%, 0402 MURATA, GRM155R71E222KA01D

4 2 C20, C21 CAP., 22µF, X5R, 10V 20%, 0603 MURATA, GRM188R61A226ME15D

5 1 C22 CAP., 1000pF, C0G, 25V, 5%, 0402 MURATA, GRM1555C1E102JA01D

6 1 C23 CAP., ALUM., 33µF, 50V, 6.3X7.7 PANASONIC, EEHZA1H330XP

7 1 C24 CAP., 4.7µF, X7R, 50V 10%, 1210 MURATA, GRM32ER71H475KA88L

8 7 C25-C30, C39 CAP., 10µF, X5R, 50V 10%, 1206 MURATA, GRM31CR61H106KA12L

9 1 C31 CAP., 1µF, X7R, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

10 2 C32, C33 CAP., 1µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C105KA12D

11 1 C34 CAP., 0.22µF, X5R, 10V 10%, 0603 MURATA, GRM188R61A224KA01D

12 1 C35 CAP., 0.1µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D

13 1 C36 CAP., 10µF, X5R, 10V, 10%, 0603 MURATA, GRM188R61A106KE69D

14 1 C38 CAP., 0.1µF, X7R, 50V, 10%, 0402 MURATA, GRM155R71H104KE14D

15 0 C40, C41(OPT) CAP., 0805

16 2 D1, D2 DIODE, DFLS260, POWER-DI-123 DIODES/ZETEX, DFLS260-7

17 1 D3 DIODE, PDS360, POWER-DI-5 DIODES/ZETEX, PDS360-13

18 6 D6-D11 DIODE, PMEG6010CEJ SOD-323 NXP., PMEG6010CEJ, 115

19 1 FB1 BEAD, CHIP, 742792150 WURTH ELEKTRONIK, 742792150

20 2 L1, L2 INDUCTOR, 33µH, WURTH ELEKTRONIK, 7447789133

21 1 L3 INDUCTOR, 15µH WURTH ELEKTRONIK, 7443551151

22 1 L4 IND., 47µH, SD SERIES, IND-SD25 EATON BUSSMANN, SD25-470-R

23 1 L6 INDUCTOR, 10µH WURTH ELEKTRONIK, 7443251000

24 2 M1, M2 N-CH MOSFET, Si7308DN, POWERPAK-1212-8 VISHAY, Si7308DN-T1-GE3

25 1 M3 N-CH MOSFET, Si7850DP, POWERPAK SO8 VISHAY, Si7850DP-T1-GE3

26 2 M4, M5 P-CH MOSFET, Si7611DN, POWERPAK-1212-8 VISHAY, Si7611DN-T1-GE3 (LEAD-FREE #)

dc2218af

DEMO MANUAL DC2218A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

27 1 R10 RES., 47.5k, 1/16W, 1% 0402 VISHAY, CRCW040247K5FKED

28 2 R11, R12 RES., 5.6k, 1/16W, 5% 0402 VISHAY, CRCW04025K60JNED

29 1 R13 RES., 15k, 1/16W, 5% 0402 VISHAY, CRCW040215K0JNED

30 1 R15 RES., 0.02Ω, 0.5W, 1% 1206 SUSUMU, RL1632R-R020-F

31 2 R16, R17 RES., 0.05Ω, 0.5W, 1% 1206 SUSUMU, RL1632R-R050-F

32 2 R25, R26 RES., 0.5Ω, 0.5W, 1% 1206 SUSUMU, RL1632R-R500-F

33 2 R28, R31 RES., 44.2k, 1/16W, 1% 0402 VISHAY, CRCW040244K2FKED

34 3 R29, R30, R35 RES., 1M, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA

35 1 R32 RES., 43.2k, 1/16W, 1% 0402 VISHAY, CRCW040243K2FKED

36 3 R33, R38, R39 RES., 10k, 1/10W, 1% 0603 VISHAY, CRCW060310R0FKEA

37 1 R40 RES., 249k, 1/16W, 1% , 0402 VISHAY, CRCW0402249KFKED

38 1 R41 RES., 38.3k, 1/16W, 1% , 0402 VISHAY, CRCW040238K3FKED

39 2 R42, R43 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

40 1 R45 RES., 100k, 1/16W, 1% , 0402 VISHAY, CRCW0402100KFKED

41 1 U3 I.C., LT3797EUKG QFN(52)(UKG)-7MMX8MM LINEAR TECH., LT3797EUKG#PBF

Additional Demo Board Circuit Components

1 1 DC2026C LINDUINO DEMO BOARD

2 2 C7, C8 CAP., 0.1µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D

3 3 C10, C11, C13 CAP., 1µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C105KA12D

4 1 C14 CAP., 0.22µF, X5R, 6.3V 10%, 0402 MURATA, GRM155R60J224KE01D

5 1 C15 CAP., 1µF, X7R, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

6 1 C16 CAP, 22µF, X7R, 6.3V, 20%, 1206 MURATA, GRM31CR70J226KE19L

7 1 C18 CAP, 22pF, NPO, 5% 50V, 0402 MURATA, GRM1555C1H220JA01D

8 1 D14 LED, GREEN, DIFFUSED, 0805 AVAGO, HSMG-C170

9 1 D31 LED, YELLOW, DIFFUSED, 0805 AVAGO, HSMY-C170

10 1 D32 LED, RED WURTH ELEKTRONIK, 150080SS75000

11 1 L5 IND, 33µH TOKO, A914BYW-330M=P3

12 16 LED1-LED16 LED, XLAMP XP-E2 SERIES CREE INC., XPEBWT-L1-0000-00D50

13 3 Q1, Q2, Q3 TRANSISTOR, MOSFET, N-CH 60V, 150mA, SOT-23 DIODES INC., VN10LFTA

14 1 R9 RES., 57.6k, 1/10W, 1%, 0603 VISHAY, CRCW060357K6FKEA

15 1 R14 POT., 10k, 10%, 1 TURN BOURNS, 91A1A-B28-A15L

16 3 R20, R21, R48 RES., 1k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA

17 1 R22 RES., 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA

18 1 R23 RES., 604k, 1/16W, 1% , 0402 VISHAY, CRCW0402604KFKED

19 1 R24 RES., 200k, 1/16W, 1% , 0402 VISHAY, CRCW0402200KFKED

20 1 R27 RES., 100Ω, 1/10W, 5% 0603 VISHAY, CRCW0603100RJNEA

21 3 R34, R36, R37 RES., 5.1k, 1/10W, 5% 0603 VISHAY, CRCW06035K10JNEA

22 1 R46 RES., 2.49k, 1W, 5% 2512 VISHAY, CRCW25122K49FKEG

23 4 R49, R50, R51, R52 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

24 2 R53, R54 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

dc2218af

DEMO MANUAL DC2218A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

25 0 R55, R81, R82(OPT) RES., OPTION, 0603

26 0 R56-R79(OPT) RES., OPTION, 0402

27 0 R80(OPT) RES., OPTION, 2512

28 1 U4 I.C., LTC6900, TSOT-23-5 LINEAR TECH., LTC6900CS5#PBF

29 1 U5 I.C., LT6656 TSOT-23-6 LINEAR TECH., LT6656ACS6-3#PBF

30 1 U6 I.C., LT3470AEDDB, DFN8DDB LINEAR TECH., LT3470AEDDB#PBF

Hardware: For Demo Board Only

1 6 E1-E6 TESTPOINT, TURRET, 0.094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

2 6 E7-E12 TESTPOINT, TURRET, 0.064" MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

3 10 JP1(4 ea), JP2(4 ea), JP3, JP4 HEADER, 3 PIN 0.079" SINGLE ROW WURTH ELEKTRONIK, 62000311121

4 10 xJP1(4 ea), xJP2(4 ea), xJP3, xJP4 SHUNT, 0.079" CENTER WURTH ELEKTRONIK, 60800213421

5 0 J1, J3, J12, J13(OPT)

6 0 J2 (OPT) R ANGLED HEADER, 2X10, 0.1" WURTH ELEKTRONIK, 61302021021

7 1 J4 HEADER, 10PIN, 0.100 SINGLE ROW WURTH ELEKTRONIK, 61301011121

8 2 J5, J9 HEADER, 8PIN, 0.100 SINGLE ROW WURTH ELEKTRONIK, 61300811121

9 0 J6 (OPT) R ANGLED SOCKET HEADER, 2X10, 0.1" WURTH ELEKTRONIK, 613020243121

10 1 J7 THROUGH HOLE CONNECTOR, POWER JACK, 2.1mm CUI INC., PJ-002AH

11 1 J8 HEADER, 6PIN, 0.100 SINGLE ROW WURTH ELEKTRONIK, 61300611121

12 2 J10, J11 CONNECTOR, BANANA JACK KEYSTONE, 575-4

13 8 MH1-MH8 STAND-OFF, NYLON, 22.2mm WURTH ELEKTRONIK, 702938000

14 2 ACRYLIC-SHIELD ACRYLIC-SHIELD, 1/8" THICK, SMOKE (GRAY COLOR) JB MACHINING, 2074

15 6 STANDOFF NYLON, 0.75" KEYSTONE, 1903D

16 6 SPACER NYLON, 0.5" KEYSTONE, 886

17 6 SCREW NYLON, 1.25" KEYSTONE, 9340

18 1 S1 SWITCH, ROTARY, 8 POSITIONS APEM, PT65526

19 1 S2 SWITCH, PUSHBUTTON, MINIATURE WURTH ELEKTRONIK, 434111025826

20 1 S3 SWITCH, B3SL SERIES OMRON, B3SL-1002P

dc2218af

DEMO MANUAL DC2218A

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