Analog Devices DC2630A User manual

1
DEMO MANUAL DC2630A
Rev. 0
DESCRIPTION
LT3966
I2C Programmable Quad
Monolithic Boost LED Driver
Demonstration circuit 2630A is an I2C programmable
quad channel monolithic boost LED driver featuring the
LT
®
3966. It drives four separate strings of LEDs (up
to50V) at 125mA when VIN is between 9V and 18V.
DC2630A runs at 2MHz switching frequency. Its four
channels are capable of powering LED strings which can
have different currents, voltages, or dimming ratios. Each
channel can be independently controlled via I2C commu-
nications or analog inputs. DC2630A can be configured to
run in either mode by modifying the ADDR pin settings.
It is protected against output overcurrent, overvoltage
events, and reports open and short LED fault events by
latching an alert pin. In I2C mode, faults can be enabled or
disabled. A DC2026C Linduino
®
One demonstration circuit
is used to interface with the board by directly connecting
it with a QuikEval™ribbon cable and provided command
line interface code.
The LT3966 has an input voltage range from 3V to 60V.
Each boost channel has an integrated 60V 1.6A low-side
power switch. It has adjustable switching frequency
between 300kHz and 2MHz and can be synchronized to
an external clock source. Additionally, LT3966 can be pro-
grammed to output its own master clock to sync other
devices. The high side PWMTG MOSFET drivers assist
with PWM dimming and fault protection. The LT3966
channels can be configured to operate as a ground-ref-
erenced step-up (boost) LED driver, or as a floating output
LED driver to perform step-down (buck mode) or step-up/
step-down (buck-boost mode) operation.
All registered trademarks and trademarks are the property of their respective owners.
Each channel of the LT3966 can be independently dimmed
by applying a PWM signal or CTRL voltage to the corre-
sponding channel CTRL/PWM pin while operating in non-
I2C mode. In I2C mode, each channel has a maximum of
13bits of PWM dimming resolution and 8 bits of analog
dimming resolution.
Small ceramic input and output capacitors are used to
save space and cost. The open LED overvoltage protection
uses the IC’s constant-voltage regulation loop to regu-
late the output to approximately 57V if the LED string
isopened.
Undervoltage lockout can be adjusted on the circuit with a
few simple resistor choices. The output voltage (overvolt-
age protection) can be adjusted by changing the feedback
resistors for different string voltages. Other components
may need to be changed to accommodate the change in
output voltages as well.
The LT3966 data sheet gives a complete description of
the device, operation and applications information. The
data sheet must be read in conjunction with this demo
manual for DC2630A. The LT3966EUJ is assembled in a
40-lead plastic 6mm × 6mm QFN package with a thermally
enhanced ground.
Design files for this circuit board are available.

2
DEMO MANUAL DC2630A
Rev. 0
PARAMETER CONDITION MIN TYP MAX UNIT
Input Voltage VIN Range Operating
Transient
9 18
36
V
V
Switching Frequency (fSW) R30 = 47.5kΩ, MPHASE = OFF 2 MHz
ILED1, ILED2, ILED3, ILED4 R3 = R16 = R22 = R26 = 2Ω 125 mA
Open LED Voltage VOUT R4 = R17 = R23 = R27 = 1MΩ
R5 = R18 = R24 = R28 = 21.5kΩ
57 V
Efficiency (100% PWM DC) VIN = 12.0V, fSW = 2MHz, VLED = 50V
ILED1 = ILED2 = ILED3 = ILED4 = 125mA
86.7%
VLED Range R4 = R17 = R23 = R27 = 1MΩ
R5 = R18 = R24 = R28 = 21.5kΩ
40 56 V
I2C Minimum PWM Dimming Frequency R30 = 47.5kΩ, SCL[2:0] = 0b111 244 Hz
VIN Undervoltage Lockout (UVLO) Falling R2 = 499kΩ, R1 = 84.5kΩ 8.5 V
VIN Enable Turn-On (EN) Rising R2 = 499kΩ, R1 = 84.5kΩ 9.7 V
Note: Make sure that the voltage applied to VIN does not
exceed 50V.
HOW TO OPERATE DC2630A IN NON-I2C MODE
The DC2630A is easy to set up to evaluate the perfor-
mance of the LT3966 in non-I2C mode. Refer to Figure1
for proper measurement equipment setup and follow the
procedure below.
1. With power off, connect a string of up to 16 LEDs
between each channel’s LED+and GND turrets.
Connect the EN/UVLO turret to GND to keep the cir-
cuit shut down. With the power off, connect the input
power supply to the VIN and GND terminals.
2. For non-I2C mode operation, set both JP1 and JP2
(ADDR1 and ADDR2) to 0. This address is for non-
I2C mode, and all other settings are for I2C serial
communications mode.
3. Adjust the input power supply voltage between 9V
and 18V and enable its output.
4. Release the EN/UVLO-to-GND connection.
5. Observe the LED string running at the programmed
LED current.
6. To change the brightness with analog dimming in
non-I2C mode, attach an adjustable voltage source
to the corresponding CTRL/PWM turrets and set
the voltage between 0V and 1.5V. See data sheet
fordetails.
7. To change brightness with external PWM dimming
in non-I2C mode, attach a rectangular waveform
with varying duty cycle to the corresponding CTRL/
PWMturrets.
HOW TO OPERATE DC2630A WITH COMMAND LINE
INTERFACE – I2C SERIAL COMMUNICATIONS MODE
The DC2630A works with a Linduino One microcontroller
board (DC2026C) and can be connected to a PC via USB.
This allows DC2630A to be controlled via serial port inter-
face in Arduino IDE. Refer to the DC2026C Demo Manual
for detailed instructions on installing and configuring the
necessary software libraries.
1. Launch Arduino IDE.
2. Connect Linduino to computer via USB.
3. Connect a ribbon cable between the J1 serial
communications connection and a Linduino One
democircuit.
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Specifications are at TA= 25°C

3
DEMO MANUAL DC2630A
Rev. 0
4. Download the Linduino code and library files from
the DC2630A web page.
5. Upload the code to the connected Linduino
democircuit.
6. With power off, connect a string of up to 16 LEDs
between each channel’s LED+and GND turrets.
Connect the EN/UVLO turret to GND to keep the cir-
cuit shut down. With the power off, connect the input
power supply to the VIN and GND terminals.
7. For I2C serial communications, set JP1 (ADDR1)
to 1 and JP2 (ADDR2) to 1. This is the chosen I2C
address for the DC2630A command line interface.
8. Open up the serial monitor inside Arduino IDE.
9. Turn on 12V power to the VIN and GND pins of
theDC2630A.
10. Use command line interface in serial monitor to eval-
uate the performance of the LT3966 demo circuit.
Figure1. Test Setup Drawing for DC2630A
QUICK START PROCEDURE

4
DEMO MANUAL DC2630A
Rev. 0
Figure2. DC2630A Input Voltage vs Efficiency – 4× Channels Powering 16 White LEDs Per Channel at 125mA
Figure3. DC2630A PWM Dimming Using I2C Settings for 1250:1 and 500:1 Dimming Ratios
TEST RESULTS
V
IN
(V)
6
8
10
12
14
16
18
20
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc2630a F02
1250:1
500:1
244Hz PWM FREQUENCY
1µs/DIV
I
LED
50mA/DIV
dc2630a F03

5
DEMO MANUAL DC2630A
Rev. 0
(a) 50% to 100%
Figure4. DC2630A Load Transient Response
(b) 100% to 50%
20µs/DIV
V
CTRL/PWM
500mV/DIV
I
LED
50mA/DIV
dc2630a F04b
TEST RESULTS
20µs/DIV
V
CTRL/PWM
500mV/DIV
I
LED
50mA/DIV
dc2630a F04a

6
DEMO MANUAL DC2630A
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 8 C1, C2, C7, C8, C11, C12, C15, C16 CAP., X7R, 2.2µF, 50V, 10% 1206 AVX, 12065C225KAT2A
2 8 C4, C5, C9, C10, C13, C14, C17, C18 CAP., X7R, 2.2µF, 100V, 10% 1206 AVX, 12061C225KAT4A
3 1 C6 CAP., X5R, 4.7µF, 16V, 10% 0603 MURATA, GRM188R61C475KAAJD
4 1 C24 CAP., X7R, 1.0µF, 50V, 10% 0603 TAIYO YUDEN, UMK107AB7105KA-T
5 4 D1, D3, D5, D7 SCHOTTKY DIODES, PMEG6010CEH, SOD-123 NXP, PMEG6010CEH
6 4 L1, L2, L3, L4 IND., 10µH WURTH ELEKTRONIK, 74438336100
7 4 R3, R16, R22, R26 RES., 2Ω, 1/2W, 1% 1206 SUSUMU, RL1632R-2R00-F
8 4 R4, R17, R23, R27 RES., 1M, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA
9 4 R5, R18, R24, R28 RES., 22.6k, 1/10W, 1% 0603 VISHAY, CRCW060322K6FKEA
10 1 R30 RES., 47.5k, 1/10W, 1% 0603 VISHAY, CRCW060347K5FKEA
11 1 U1 IC., LT3966, QFN-40, 6mm × 6mm ANALOG DEVICES., LT3966EUJ#PBF
Additional Demo Board Components
1 1 C3 CAP., ALUM., 47µF, 50V, 6.3×7.7 SIZE WURTH ELEKTRONIK, 865080645012
2 0 C20–C23(OPT) CAP., OPTION, 0603
3 4 M1, M2, M3, M4 P-MOSFET, 60V, SOT-23 VISHAY, Si2309CDS-T1-GE3
4 1 R1 RES., 84.5k, 1/10W, 1% 0603 VISHAY, CRCW060384K5FKEA
5 1 R2 RES., 499k, 1/10W, 1% 0603 VISHAY, CRCW0603499KFKEA
6 0 R6, R7, R12, R13, R14, R15, R19,
R20, R21, R25, R31, R33, R34
RES., OPTION, 0603
7 5 R8, R9, R10, R11, R29 RES., 100k, 1/10W, 1% 0603 VISHAY, CRCW0603100KFKEA
Hardware: For Demo Board Only
1 8 E3, E4, E8, E11, E16, E17, E18, E20 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0
2 13 E1, E2, E5, E6, E7, E9, E10, E12, E13,
E14, E15, E19, E21
TESTPOINT, TURRET, .061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0
3 2 JP1, JP2 HEADER 3-PIN 0.079 DOUBLE ROW WURTH ELEKTRONIK, 62000621121
4 2 XJP1 ,XJP2 SHUNT, .079" CENTER WURTH ELEKTRONIK, 60800213421
5 1 J1 HEADER, 2×7 DUAL ROW MOLEX, 87831-1420
6 2 J2, J3 JACK BANANA KEYSTONE, 575-4
7 4 MH1–MH4 STAND-OFF, NYLON 6.4mm WURTH ELEKTRONIK, 702931000
PARTS LIST

7
DEMO MANUAL DC2630A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCL SDA
NOTES: UNLESS OTHERWISE SPECIFIED.
1. ALL CAPACITORS AND RESISTORS ARE 0603.
1
0
FLOAT
1
0
FLOAT
ADDR1 ADDR2
(36V TRANSIENT)
VIN
FB1
VIN
VOUT1
FB2
FB3 FB4
VIN
VOUT2
VIN
VOUT3
VIN
VOUT4
J29V - 18V
VIN
C20
OPT
D3
PMEG6010CEH
L4
10uH
74438336100
M3
Si2309CDS



GND
E20
R7 OPT
J3
GND
C24
1uF
50V
J1
V+
1
GND
3
MISO
5MOSI/SDA 7
EESDA
9
EESCL
11
GND
13
5V
2
SCK/SCL
4CS
6
GND
8
EEVCC
10
EEGND
12
GPIO
14
C1
2.2uF
1206
50V
JP1
12
3
56
4
LED4+
E18 125mA
50VLED
R18
22.6K
L3
10uH
74438336100
GND
E17
C15
2.2uF
1206
50V
C10
2.2uF
1206
100V
CTRL/PWM3 E12
R19 OPT
C21
OPT
C11
2.2uF
1206
50V
R30 47.5K 2MHz
LED3+
E16 125mA
50VLED
C7
2.2uF
1206
50V
C4
2.2uF
1206
100V
EXT2 E15
R12
OPT
R11 100k
R3 2
1206
GND
E11
L2
10uH
74438336100
D7
PMEG6010CEH
R8
100k
INTVCC E7
R5
22.6K
R28
22.6K
C2
2.2uF
1206
50V
R15
OPT
TP2
D5
PMEG6010CEH
GND
E21
R24
22.6K
R26
2
1206
SYNC E6
C9
2.2uF
1206
100V
R4
1M
CTRL/PWM2 E10
R34 OPT
C17
2.2uF
1206
100V
ALERT
E19
R17
1M
C18
2.2uF
1206
100V
R21 OPT
R22
2
1206
EXT1 E14
+
C3
47uF
50V
865080645012
R10
100k
C5
2.2uF
1206 100V
GND E2
R13
OPT
M2
Si2309CDS


C6
4.7uF
R33 OPT
R29 100k
R20 OPT
R31 OPT
C14
2.2uF
1206
100V
C16
2.2uF
1206
50V
CTRL/PWM1 E9
M1
Si2309CDS


EN/UVLO E5
C23
OPT
L1
10uH
74438336100
R16 2
1206
C12
2.2uF
1206 50V
VIN E1
R27
1M
R14
OPT
CTRL/PWM4 E13
R9
100k
C13
2.2uF
1206
100V
R2
499k
D1
PMEG6010CEH
TP1
JP2
12
3
56
4
C8
2.2uF
1206 50V
R6 OPT
R25 OPT
LED1+
E3 125mA
50VLED
R1
84.5k
C22
OPT
U1 LT3966EUJ
TG1 2 TG2 29
TG3 7 TG4 24
ISP11 ISP230
ISP38
ISP423
SW1 3
SW2 28
SW3 6
SW4 26
SW4 25 SW3 5
SW1 4
ISN1 40 ISN2 31
ISN3 9
ISN4 22
SW2 27
VIN
38
FB1 39 FB2 32
FB3 10 FB4 21
CTRL/PWM1
11
CTRL/PWM2
12
CTRL/PWM3
13
CTRL/PWM4
14
EXT1
15
EXT2
35
ADDR1
16
ADDR2
17
SDA 18
SCL 19
ALERT
20
EN/UVLO
36
INTVCC
37
SYNC
34
RT
33
GND
41
LED2+
E8 125mA
50VLED
GND
E4
M4
Si2309CDS


R23
1M
ALERT
SCL
INTVCC
SDA
ALERT
INTVCC
INTVCC
INTVCC
INTVCC
SCHEMATIC DIAGRAM

8
DEMO MANUAL DC2630A
Rev. 0
 ANALOG DEVICES, INC. 2020
10/20
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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