Linear Analog Devices LT3960 Guida rapida alla configurazione

DEMO MANUAL DC2686A

Rev. 0

DESCRIPTION

LT3967/LT3960

1.3A 8-Switch Matrix LED Dimmer with I2C

to CAN-Physical Layer Transceiver

Demonstration circuit 2686A is a 1.3A 8-switch matrix LED

dimmer system with an I2C to CAN-physical transceiver

featuring the LT

3967 and LT3960. This demonstration

circuit connects directly to a LED string and LED driver

demonstration circuit to allow for independent dimming

control of up to 8 channels of LEDs. A Linduino

One

demonstration circuit is used to interface with the board

and can connect in one of two different ways:

1. Connect directly to a Linduino One demonstration

circuit with a QuikEval™ ribbon cable.

2. Connect using the LT3960 break-off board to con-

nect to the I2C master device, but pass data over two

twisted pair lines to the LT3960 on the main PCB.

The LT3967 matrix dimmer features 8 individually con-

trolled 1.3A rated floating NMOS switch channels and can

support up to 56V of LEDs per device. The channels of

the LT3967 can be configured for series connections, or

non-series connections. Additional DC2686A demo cir-

cuits can be connected in series for higher number of

LEDs, or in parallel to allow for higher current operation.

Resistors are used to configure both the I

C slave address

as well as the default start-up state. The default configu-

ration for DC2686A sets the I2C address as 0000 with all

LEDs off. See the LT3967 data sheet for details.

All registered trademarks and trademarks are the property of their respective owners.

The LT3960 I2C to CAN-Physical transceiver is used to

send and receive I2C data through harsh or noisy envi-

ronments at up to 400kb/s using the CAN-Physical layer

for differential signaling over twisted pair connections.

Both SDA and SCL data lines are converted to differential

signals and are shared between devices connected to the

bus. This allows for physical separation of the I2C source

with the LT3960 transceiver board and the LT3967 main

PCB along with the LED driver.

This demo circuit is designed to be easily configured and

interfaced with a compatible low output capacitance LED

driver and LED string. It can easily be directly attached

to a buck LED driver or a floating buck-mode LED driver.

More sophisticated setups with series matrix dimmers

for higher number of LEDs such as 12 or 16 is possible.

Please consult factory applications for details or look for

more details on analog.com.

The LT3967 and LT3960 data sheets give complete

description of the parts, their operation and applications

information. The data sheets must be read in conjunc-

tion with this demo manual for demonstration circuit

DC2686A. The LT3967EFE is assembled in a thermally

enhanced 28-lead TSSOP package. The LT3960EMSE is

assembled in a 10-lead MSOP package.

Design files for this circuit board are available.

DEMO MANUAL DC2686A

Rev. 0

PARAMETER CONDITION MIN TYP MAX UNIT

Input Voltage LT3967, Operating

LT3960, Operating

4.5

5.5

LED Voltage LT3967, Operating 56 V

LED Current LT3967, Operating 1.3 A

LT3967 ENH Threshold Falling Voltage (VIN – ENH) R1 = 10k, R2 = 49.9k 1.10 1.22 1.34 V

LT3960 EN/MODE Voltage Master Mode

Slave Mode

Low-Power Shutdown Mode

0.7

Ext LDO Output Voltage R22 = 392k, R23 = 127k 5 V

Ext CLK Frequency R13 = 57.6k 350 kHz

LT3967 PWM Dimming Frequency Ext CLK to RTSYNC 170 Hz

LT3967, LT3960 I2C CLK Frequency 400 kHz

LT3967 POR Initial Switch State RADRR[4:1] = 0Ω LED Off

In order to properly function, DC2686A must be interfaced

with a low output capacitance Buck LED driver or floating

buck-mode LED driver. The input power supply to both

LED driver and DC2686A must be set to at least 6V higher

than each LT3967 SRC channel source voltage. This demo

manual highlights interfacing DC2686A with a buck LED

driver. For buck mode connections, refer to the LT3967

data sheet.

DC2686A works with a Linduino microcontroller board

(DC2026C) and can be connected to a PC via USB. This

allows DC2686A to be controlled via serial port interface

in Arduino IDE. Refer to the DC2026C demo manual for

detailed instructions on installing and configuring the nec-

essary software and libraries.

1. Launch Arduino IDE.

2. Connect Linduino to computer via USB.

3. Download the Linduino code and library files from the

DC2686A web page

4. Upload the code to the connected Linduino

democircuit.

5. With input power off, connect the input power supply

from LED Driver to VIN and GND of DC2686A.

6. Connect LED

and LED

–

from LED driver to DC2686A

LED+and LED–terminals.

7. Connect 8 LEDs as shown in Figure1 and Figure2.

8. Connect Linduino to DC2686A using one of the two

methods shown in Figure1 and Figure2.

9. Open up the serial monitor inside Arduino IDE.

10. Turn on input power supply.

11. Use command line interface in serial monitor to con-

trol and monitor LEDs.

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

DEMO MANUAL DC2686A

Rev. 0

Figure1. Quick-Start Procedure Setup Drawing for DC2686A (without LT3960)

Figure2. Quick Start Procedure Setup Drawing for DC2686A (with LT3960)

QUICK START PROCEDURE

*SNAP OFF SMALL BOARD

FROM THE MAIN BOARD

TO SET UP VIA LT3960

DEMO MANUAL DC2686A

Rev. 0

SETUP DIFFERENCES BETWEEN BUCK VS BUCK-MODE

When using DC2686A with a buck LED driver, connect the

VIN of the buck LED driver directly to VIN of LT3967, and

ensure that VIN is 6V higher than channel source voltages

on the LT3967. When interfacing with a floating buck-

mode LED driver, a charge pump is necessary to create

the needed 6V headroom from VIN to VSRC. Please ref-

erence LT3967 data sheet for details on how to properly

implement this.

SETTING THE ADDRESS AND POR DEFAULT

SWITCHSTATE

Both the I2C address and power-on-reset (POR) default

switch state are configured by placing resistors between

the ADDR pins. Connecting the ADDR pins either VDD or

GND defines the unique I

C address. Using a resistor value

less than 5k to set the address configures the LT3967

to start-up with the LEDs off, and using a resistor value

greater than 50k configures the LEDs to be on. Refer to

the LT3967 data sheet for detailed explanation on setting

the default POR settings and I2C address.

SETTING THE PWM DIMMING FREQUENCY

Dimming frequency for the LT3967 can be configured

either by the internal oscillator or an external clock source.

The LT3967’s internal oscillator frequency is set by con-

necting a resistor from the RTSYNC pin to GND. Refer to

the LT3967 data sheet for guidance on sizing this resistor

for the desired dimming frequency.

An external clock source capable of sink 500µA at 0.4V

can be used to override the internal oscillator. If either

the internal oscillator or external clock source become

slower than 100kHz, then the IC will switch to a 100kHz

internal standby clock. The PWM dimming frequency is

derived using clock division of the RTSYNC signal, diving

down by2048. DC2686A is equipped with an external

clock source (LTC6900CS5) that can be powered from the

5V rail of either the onboard LDO or a connected Linduino.

UTILIZING LT3960 FOR SERIAL COMMUNICATION

The LT3960 can be used to communicate with the

LT3967 over longer distances and/or in noisy environ-

ments. DC2686A has two LT3960 ICs, one local to the

LT3967IC, and another on a snap-off board that plugs

directly into the QuikEval header of the Linduino demo

circuit (DC2026C).

The LT3960 on the snap-off board is powered by a

Linduino when connected via QuikEval header. The EN/

MODE pin is tied to the drain of a MOSFET that can be

controlled by a Linduino. The MOSFET allows configu-

ration of IC to be set to master mode, slave, or power

off. The LT3960 on the main board can be powered by

the on-board LDO. EN/MODE pin is not connected, con-

figuring this device in slave mode. Twisted pair connec-

tions should be made between the differential pins of the

LT3960 using the terminal blocks to connect.

PROGRAMMING THE NUMBER OF CHANNELS

A single LT3967 can control up to 8 individual chan-

nels. For any unused channels, connect the associated

DRN pins to V

with 100k resistor and the SRC pins

to GND. This ensures proper fault monitoring for the

unusedchannels.

LEDs can be driven in series by adding 0Ω resistors to

R6, R7, R10, R11, R12, R14, R15, which connects adja-

cent DRN and SRC channels at the J2 and J4 connectors.

Channels can also be separated for individual LEDs control

with non-serial LED string connections. DC2686A is con-

figured for 8-channel operation but has resistor options

that allow for easy reconfiguring to allow for as low as

6LEDs. Solder a 0Ω resistor to R16, R18, and 100k to

R20, R21 to defeat the lower 2 channels of the LT3967.

CONFIGURING THE ARDUINO COM TERMINAL

For operation of the command line interface, parameters

of the terminal window must be set properly. 115200

Baud, No line ending, and Clear output should be selected.

See Figure3 for details.

BOARD OPTIONS

DEMO MANUAL DC2686A

Rev. 0

Figure3. Arduino COM Terminal Window; Selectable Options Menu

BOARD OPTIONS

DEMO MANUAL DC2686A

Rev. 0

Figure4. Two Series-Connected LT3967 ICs

ADDR1

ADDR2

ADDR3

ADDR4

LT3967

ENH

ALERT

SCL

SDA

RTSLK

VDD

ALERT

SCL

SDA

10k

49.9k

LED+

CIN3

1µF

100V

VIN

GND

WDI

LED–0.1µF

10k

+5V

ADDR1

ADDR2

ADDR3

ADDR4

LT3967

ENH

ALERT

SCL

SDA

RTSLK

VDD

ALERT

SCL

SDA

10k

49.9k

LED+

CIN2

1µF

100V

VIN

GND

WDI

0.1µF

10k

+5V

LED+

EXTERNAL

CLOCK

SOURCE

+5V

DC2786A F04

BOARD OPTIONS

DEMO MANUAL DC2686A

Rev. 0

TEST RESULTS

Figure5. Thermal Capture of DC2686A at 50VIN, 8 Channels Shorted Through IC at 1.3A. LED+= 1.2V, LED−= 0V

DEMO MANUAL DC2686A

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Electrical Components for LT3967 Matrix Dimmer

1 1 C1 CAP., 1µF, X7S, 100V, 10%, 0805, AEC-Q200,

NOSUBS.ALLOWED

MURATA, GCM21BC72A105KE36L

2 1 C4 CAP., 0.1µF, X7R, 10V, 10%, 0402, AEC-Q200 MURATA, GCM155R71A104KA55D

3 1 D1 DIODE, SCHOTTKY, 60V, 1A, SOD-123F, AEC-Q101 NEXPERIA, PMEG6010CEH, 115

4 1 R1 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060310K0FKEA

5 1 R2 RES., 49.9k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4992V

6 1 U1 IC, 8-SWITCH MATRIX LED DIMMER, TSSOP-28, 1.3A ANALOG DEVICES., LT3967EFE#PBF

Optional Electrical Components for LT3967 Matrix Dimmer

7 1 C5 CAP., 0.1µF, X7R, 16V, 10%, 0603, AEC-Q200 MURATA, GCM188R71C104KA37D

8 6 RC1, R3, R40, R41, R42, R43 RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA

9 1 R4 RES., 10k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0FKED

10 0 R6, R7, R10, R11, R12, R14,

R15, R16, R18, R19, R20,

R21, R44, R45, R46, R47

RES., OPTION, 0603

11 1 R13 RES., 57.6k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF5762V

12 1 R17 RES., 121k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603121KFKEA

13 1 R39 RES., 22k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060322K0FKEA

14 1 U2 OSCILLATOR, 1kHz to 20MHz, 5k AND/OR 10pF,

±40ppm,TSOT23-5, RESISTOR SET OSC.

ANALOG DEVICES, LTC6900CS5#PBF

Required Electrical Components for LT3960 I2C CAN

15 2 C9, C15 CAP., 2.2µF, X7S, 10V, 10%, 0603, AEC-Q200 TDK, CGA3E3X7S1A225K080AB

16 2 C10, C13 CAP., 1µF, X7R, 25V, 10%, 0603, AEC-Q200 MURATA, GCM188R71E105KA64D

17 4 C11, C12, C14, C16 CAP., 4700pF, X7R, 25V, 10%, 0402, AEC-Q200 YAGEO, AC0402KRX7R8BB472

18 1 Q1 XSTR., MOSFET, N-CH, 60V, 210mA, SOT-23, AEC-Q101 DIODES INC.2N7002Q-7-F

19 4 R25, R26, R33, R34 RES., 4.99k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06034K99FKEA

20 8 R27, R28, R29, R30, R31,

R32, R35, R36

RES., 60.4Ω, 1%, 1/8W, 0805, AEC-Q200 VISHAY, CRCW080560R4FKEA

21 1 R38 RES., 1k, 5%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K00JNEA

22 2 U4, U5 IC, 12C TO DUAL CAN TRANSCEIVER, MSOP-10 ANALOG DEVICES, LT3960EMSE#PBF

Optional Electrical Components for LT3960 I2C CAN

23 1 R37 RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EB

Components for Optional 5V Source

24 1 C7 CAP., 0.47µF, X7R, 16V, 10%, 0603, AEC-Q200 MURATA, GCM188R71C474KA55D

25 1 C8 CAP., 1µF, X7R, 25V, 10%, 0603, AEC-Q200 MURATA, GCM188R71E105KA64D

26 0 R5 RES., OPTION, 0805

27 1 R22 RES., 392k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603392KFKEA

28 1 R23 RES., 127k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603127KFKEA

29 1 R24 RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA

30 1 U3 IC, LDO MICROPOWER LINEAR REG., SOT23-5, 20mA,

3VTO 80V

ANALOG DEVICES, LT3014IS5#PBF

PARTS LIST

DEMO MANUAL DC2686A

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware

31 4 E1, E2, E3, E4 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0

32 3 E5, E6, E7 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0

33 1 J1 CONN., HDR, SHROUDED, MALE, 2×7, 2mm, VERT, ST, THT MOLEX, 87831-1420

34 2 J2, J4 CONN., HDR, MALE, 1×10, 2.54mm, VERT, ST, THT SAMTEC, TSW-110-07-L-S

35 2 J3, J6 CONN., TERM BLOCK, 5 POS, 2.54mm, ST, THT,

SIDEENTRY, GREEN

ON-SHORE TECHNOLOGY, OSTVN05A150

36 1 J5 CONN., SOCKET STRIP, RCPT, FEMALE, 2×7, 2mm,

VERT,ST, THT

MOLEX, 0791077006

PARTS LIST

DEMO MANUAL DC2686A

Rev. 0

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