Analog Devices EVAL-LT8376-AZ Quick setup guide

1
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
DESCRIPTION
LT8376
60V, 2A Silent Switcher
Synchronous Step-Down LED Driver
Evaluation board EVAL-LT8376-AZ is a 60V, 2A syn-
chronous Buck LED driver featuring the LT
®
8376. EVAL-
LT8376-AZ drives a single string of LEDs up to 36V at
1.5A when V
IN
is between 43V and 57V. EVAL-LT8376-AZ
has an undervoltage lockout (UVLO) set at 40V with 2V
hysteresis for turn-on. EVAL-LT8376-AZ runs at 350kHz
switching frequency and features optional spread spec-
trum modulation (SSFM). With SSFM enabled, LT8376
modulates its switching frequency from fSW to fSW + 25%
to reduce EMI emissions.
The LT8376 has an input voltage range of 3.6V to 60V.
LT8376 has internal, synchronous 60V switches for
high efficiency and small size. LT8376 has an adjustable
switching frequency between 200kHz and 2MHz. The
LT8376 can be synchronized with an external clock source
or configured with SSFM enabled for low EMI. EVAL-
LT8376-AZ includes a SYNC/SSFM jumper to configure
the LT8376 for either external frequency synchronization,
SSFM enabled for low EMI, or set to normal operation
with SSFM disabled.
The LT8376’s integrated PWMTG high-side PMOS driver
assists with PWM dimming of the connected LEDs. The
LED string can be PWM dimmed for accurate brightness
control with an externally generated PWM signal or an
internally-generated PWM signal. EVAL-LT8376-AZ has
jumpers that can be set to switch between internally-gen-
erated PWM signal, externally generated PWM signal, and
100% on with no PWM signal. The LT8376 can also be
analog dimmed by placing a controllable DC voltage on
the CTRL pin. When running PWM dimming with SSFM
enabled, the SSFM aligns itself with the PWM signal for
flicker-free operation of the LED string. This applies to
both internal and external PWM dimming.
All registered trademarks and trademarks are the property of their respective owners.
Small ceramic input and output capacitors are used to
save space and cost. The input and output filters on
EVAL-LT8376-AZ reduce its EMI. The filters consist of a
small ferrite bead or inductor and high frequency ceramic
capacitors. These filters, combined with proper board
layout and SSFM, are very effective in reducing EMI to
comply with CISPR25 class 5 limits. Please follow the
recommended layout and the four-layer PCB thickness of
EVAL-LT8376-AZ. For best efficiency and PWM dimming
performance, the EMI filters at the input and output can
be removed.
The open LED overvoltage protection (OVP) uses the IC’s
constant voltage regulation loop to regulate the output to
approximately 41V if the LED string is opened. The output
current can be monitored through the ISMON pin. Also,
the FAULT pin can be used for open and short detection.
The input undervoltage lockout (UVLO), LED current,
output overvoltage protection (OVP), and switching fre-
quency, can all be easy adjusted with simple modifications
to EVAL-LT8376-AZ.
The LT8376 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 evaluation board EVAL-LT8376-AZ. The LT8376RV
is assembled in a 28-lead plastic LQFN package with a
thermally enhanced exposed ground pad. Proper board
layout is essential for maximum performance. See the
data sheet section “Designing the Printed Circuit Board”.
Design files for this circuit board are available.

2
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITION MIN TYP MAX UNITS
Input Voltage EMIVIN Range Operating 43 57 V
Switching Frequency (fSW) R5 = 287k, JP2 = NO SSFM 350 kHz
Spread Spectrum (SSFM) Range R5 = 287k, JP2 = SSFM 350 440 kHz
ILED R1 = 0.05Ω, R8, R15 = 100k,
43V < VIN < 57V, VLED = 36V
1.5 A
Open LED Voltage VOUT (OVP) R7 = 1M, R6 = 24.9k 41 V
Typical Efficiency VIN = 50V, VLED = 36V, ILED = 1.5A
with Filters
without Filters
96
96.5
%
%
Internally-Generated PWM Dimming Range JP3 = INT, JP4 = INT 1/128 100 %
Internally-Generated PWM Dimming Frequency JP3 = INT, JP4 = INT
R12 = 118k, R5 = 287k
192 Hz
Peak Current Limit 3.3 3.6 3.9 A
EMIVIN Undervoltage Lockout (UVLO) Falling R3 = 402k, R2 = 12.7k 39.8 V
EMIVIN Enable Turn-On (EN) Rising R3 = 402k, R2 = 12.7k 42.3 V
BOARD PHOTO

3
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
PROGRAMMING LED CURRENT VIA CTRL PIN
The LT8376 uses the voltage across the current sense
resistor R1, and the voltage at the CTRL pin to program
the LED current. The maximum current sense resistor
voltage that can be programmed on the LT8376 is 100mV.
When VCTRL falls below 250mV, the LED current will be
0A and when VCTRL is above 1.25, the LED current will
be the maximum set by the current sense resistor. EVAL-
LT8376-AZ uses a 50mΩcurrent sense resistor, and a
voltage divider on the CTRL pin to regulate the LED cur-
rent to 1.5A. R8 and R15 set the voltage divider from
VREF pin to the CTRL pin. EVAL-LT8376-AZ will produce
a maximum LED current of 2A when VCTRL > 1.25V. The
LED current can be analog dimmed to another current
level by adjusting R8 and R15. Please refer to the data
sheet for more details.
QUICK START PROCEDURE
Evaluation board EVAL-LT8376-AZ is easy to set up to
evaluate the performance of the LT8376. Follow the pro-
cedure below:
1. With power off, connect a string of LEDs that will run
with forward voltage less than or equal to 36V (at 1.5A)
to the LED+ and LED–turrets on the PCB as shown in
Figure1.
2. Set JP4 to EXT/ON and JP3 to ON for 100% always
on LED operation. Set JP2 to NO SSFM to run without
SSFM.
3. With power off, connect the input power supply to the
EMIVIN and GND turrets. Make sure that the DC input
voltage will not exceed 60V.
4. Turn the input power supply on and make sure the
voltage is between 43V and 57V for proper operation
at max LED current.
5. Observe the LED string running at the programmed
LED current.
6. To change the brightness with analog dimming, simply
attach a voltage source to the CTRL test point and set
the voltage between 0.25V and 1.25V. See data sheet
for details.
7. To change the brightness with external PWM dimming,
set JP4 to EXT/ON and JP3 to EXT. Attach a 1.5V rect-
angular waveform with varying duty cycle to the PWM
terminal.
8. To change the brightness with internally-generated
PWM dimming, set JP4 to INT and JP3 to INT. Adjust
the setting of the V
R1
variable resistor with a small
flathead screwdriver to toggle between 0% and 100%
PWM dimming duty cycle in 1/128 steps.
9. To enable spread spectrum frequency modulation, set
JP2 to SSFM.

4
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
Figure1. Setup Drawing for EVAL-LT8376-AZ
QUICK START PROCEDURE

5
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
Efficiency vs VIN
EVAL-8376 F02
f
SW
= 350kHz
SSFM = ON
I
LED
= 1.5A
V
LED
= 36V
WITH EMI FILTERS
WITHOUT EMI FILTERS
INPUT VOLTAGE (V)
40
42
44
46
48
50
52
54
56
58
60
80
82
84
86
88
90
92
94
96
98
100
EFFICIENCY (%)
Figure2. EVAL-LT8376-AZ Efficiency vs VIN
Internal PWM Dimming
128:1 PWM RATIO, 192Hz PWM FREQUENCY
10µs/DIV
V
SW
50V/DIV
PWMTG
20V/DIV
I
L
2A/DIV
I
LED
2A/DIV
EVAL-8376 F03
Figure3. EVAL-LT8376-AZ Internal PWM
Dimming with EMI Filters: 48VIN, 36VLED, 1.5A
Transient Response
500µs/DIV
I
LED
500mA/DIV
V
CTRL
500mV/DIV
EVAL-8376 F04
Figure4. EVAL-LT8376-AZ: 50% to 100% to 50%
Load Step Transient Response, 48VIN
TEST RESULTS
Figure5. EVAL-LT8376-AZ Board Thermal Image: 48VIN, 36VLED, 1.5A (SSFM ON)

6
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
Figure6. EVAL-LT8376-AZ Conducted Emissions (Voltage Method): 48VIN, 36VLED, 1.5A (SSFM ON)
TEST RESULTS
Figure7. EVAL-LT8376-AZ Conducted Emissions (Current Method): 48VIN, 36VLED, 1.5A (SSFM ON)
Figure8. EVAL-LT8376-AZ Radiated Emissions: 48VIN, 36VLED, 1.5A (SSFM ON)
CLASS 5 PEAK LIMIT
EVAL-LT8376-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–20
–10
0
10
20
30
40
50
60
70
80
PEAK CE (dBµV)
EVAL-8376 F06a
(a) CISPR25 Peak Conducted EMI – Voltage Method
CLASS 5 AVERAGE LIMIT
EVAL-LT8376-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–20
–10
0
10
20
30
40
50
60
70
80
AVERAGE CE (dBµV)
EVAL-8376 F06b
(b) CISPR25 Average Conducted EMI – Voltage Method
CLASS 5 PEAK LIMIT
EVAL-LT8376-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
300
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
PEAK CE (dBµA)
EVAL-8376 F07a
(a) CISPR25 Peak Conducted EMI – Current Method
CLASS 5 AVERAGE LIMIT
EVAL-LT8376-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
300
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
AVERAGE CE (dBµA)
EVAL-8376 F07b
(b) CISPR25 Average Conducted EMI – Current Method
CLASS 5 PEAK LIMIT
EVAL-LT8376-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
1000
–20
–10
0
10
20
30
40
50
60
PEAK RE (dBµV/m)
EVAL-8376 F08a
(a) CISPR25 Peak Radiated EMI
CLASS 5 AVERAGE LIMIT
EVAL-LT8376-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
1000
–20
–10
0
10
20
30
40
50
60
AVERAGE RE (dBµV/m)
EVAL-8376 F08b
(b) CISPR25 Average Radiated EMI

7
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., 10μF, X7R, 50V, 10%, 1206 SAMSUNG, CL31B106KBHNNNE
2 2 C2, C3 CAP., 4.7μF, X7S, 100V, 10%, 1210 SAMSUNG, CL32Y475KCVZW6E
3 3 C4-C6 CAP., 0.47μF, X7R, 100V, 10%, 0805 AVX, 08051C474KAZ2A
4 1 C7 CAP., 2.2μF, X7R, 10V, 10%, 0603 MURATA, GRM188R71A225KE15D
5 1 C8 CAP., 2.2μF, X5R, 10V, 20%, 0402 WURTH ELEKTRONIK, 885012105013
6 1 C11 CAP., 100pF, C0G, 50V, 5%, 0402, AEC-Q200 MURATA, GCM1555C1H101JA16D
7 1 C12 CAP., 0.01μF, X7R, 25V, 10%, 0402, AEC-Q200 TAIYO YUDEN, TMK105B7103KVHF
8 1 C16 CAP., 1μF, X5R, 10V, 10%, 0402 SAMSUNG, CL05A105KP5NNNC
9 1 C17 CAP., 47pF, C0G, 50V, 10%, 0402 AVX, 04025A470KAT2A
10 1 C20 CAP., 0.1μF, X5R, 100V, 10%, 0402, SMD MURATA, GRM155R62A104KE14D
11 1 C24 CAP., 47μF, ALUM ELECT, 63V, 20%,
8mm × 10.2mm, F, SMD, RADIAL
PANASONIC, EEEHA1J470UP
12 1 C26 CAP., 2.2μF, X5R, 25V, 10%, 0603, AEC-Q200 TAIYO YUDEN, TMK107BBJ225KAHT
13 1 L1 IND., 47μH, PWR, SHIELDED, 20%, 3.1A,
4040DD, IHLE-5A SERIES, AEC-Q200
VISHAY, IHLE4040DDER470M5A
14 1 M1 XSTR., MOSFET, P-CH, 60V, 16A,
PowerPAK 1212-8, AEC-Q101
VISHAY, SQ7415AEN-T1-GE3
15 1 R1 RES., 0.05Ω, 1%, 1/2W, 1206, SENSE IRC, LRC-LR1206LF-01-R050-F
16 1 R2 RES., 12.7k, 1%, 1/16W, 0402 YAGEO, RC0402FR-0712K7L
17 1 R3 RES., 402k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF4023X
18 1 R4 RES., 16k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040216K0JNED
19 1 R5 RES., 287k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402287KFKED
20 1 R6 RES., 24.9k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2492TRF
21 1 R7 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1004TRF
22 2 R8, R15 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED
23 1 R9 RES., 47k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J473TRF
24 1 R10 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
25 1 R11 RES., 91k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J913TRF
26 1 R12 RES., 118k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1183TRF
27 1 R13 RES., 1M, 1%, 1/10W, 0402 NIC, NRC04F1004TRF
28 1 R14 RES., 2M, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022M00FKED
29 1 U1 IC, 60V 2A, SYNCHRONOUS BUCK LED DRIVER,
LQFN-28
ANALOG DEVICES, LT8376RV#PBF
30 1 VR1 RES., 100k, 20%, 1/4W, SMD 4mm SQ, 1-TURN,
TOP ADJ., TRIMPOT
BOURNS, 3314J-1-104E
Optional EMI Filter Components
31 1 C13 CAP., 0.1μF, X7R, 100V, 10%, 0603 AVX, 06031C104KAT2A
32 1 C14 CAP., 4.7μF, X7S, 100V, 10%, 1210 SAMSUNG, CL32Y475KCVZW6E
33 1 C15 CAP., 0.1μF, X7R, 50V, 10%, 0402, AEC-Q200 MURATA, GCM155R71H104KE02D
34 0 FB1 IND., 1k AT 100MHz, FERRITE BEAD, 25%,
1.5A, 150mΩ, 0805
TDK, MPZ2012S102AT000
35 1 FB2 IND., 600Ω AT 100MHz, FERRITE BEAD, 25%,
2A, 100mΩ, 0805
TDK, MPZ2012S601AT000

8
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
36 1 L2 IND., 15μH, PWD, 20%, 2.9A, 109mΩ, 4mm × 4mm,
AEC-Q200
COILCRAFT, XAL4040-153MEB
Optional Electrical Components
37 0 C9 CAP., 10μF, X7R, 50V, 10%, 1206 SAMSUNG, CL31B106KBHNNNE
38 0 C19, C22 CAP., OPTION, 0402
39 0 R18 RES., 0Ω, 1/16W, 0402 NIC, NRC04ZOTRF
40 0 R19 RES., OPTION, 0603
41 0 R20 RES., OPTION, 0402
42 0 TP1, TP3, TP4 TESTPOINT, PCB COPPER FEATURE N/A
43 0 TP2, TP5-TP7 TESTPOINT, PCB COPPER FEATURE N/A
Hardware: For Demo Board Only
44 6 E1, E6-E10 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2308-2-00-80-00-00-07-0
45 4 E2-E5 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2501-2-00-80-00-00-07-0
46 3 JP1-JP3 CONN., HDR, MALE, 2×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121
47 1 JP4 CONN., HDR, MALE, 2×2, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000421121
48 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.375" WURTH ELEKTRONIK, 702933000
49 4 XJP1-XJP4 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421

9
DEMO MANUAL EVAL-LT8376-AZ
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.
SCHEMATIC DIAGRAM
1. ALL RESISTORS ARE 0402, 1%. ALL CAPACITORS ARE 0402 NOTE: UNLESS OTHERWISE SPECIFIED
350kHz
C26
2.2uF
0603
E6
CTRL
C12 0.01uF
FB1
MPZ2012S102AT000
OPT
M1
SQ7415AEN
R19
OPT
0603
JP1
LATCH OFF
DEFEAT
HICCUP
FAULT
1 3 5 6
4 2
C14 4.7uF 1210 100V
JP3
ON EXT INT
PWM
1 3 5 6
4 2
FB2
MPZ2012S601AT000
C7 2.2uF 0603 10V
E8 GND
C5 0.47uF 100V
C2 4.7uF 1210
E9
EN/UVLO
C8 2.2uF
C20 0.1uF 100V
E5 GND
LED-
U1
LT8376
VOUT 14
SS
2
GND
15
VREF
1
CTRL
28
EN/UVLO
27 FB 4
NC 36
GND
31
GND
29
VC
3
ISN 6
NC 34
ISP 5
NC 35
RT
10
GND
30
PWMTG 13
NC 33
RP
9
INTVCC 25
FAULT 8
SW 19
SW 18
SYNC/SPRD 11
VIN 16
VIN 17
VIN 20
VIN 21
VIN
26
BOOST 24
ISMON
7
PWM
12
GND
22
GND
23
GND
32
R14
2M
C1 10uF 1206 50V
R6
24.9k
TP6
GND
E3
EMIVIN
43V-57V
R5
287K
E4
LED+
36VLED 1.5A
TP7
ISMON
C11 100pF
TP1 VC
R13
1M
C13 0.1uF 100V 0603
C15 0.1uF 50V
C9 1206 50V OPT
R12 118k
R20 OPT
R9
47k 5%
R11
91k 5%
R3
402k
TP2 VOUT
L2
15uH
XAL4040-153MEB
R2
12.7k
C17 47pF
E10
EXT SYNC
R18 0 OPT
C22 OPT
E7
PWM
R10 100k 5%
E2
GND
C6 0805
C3 100V
JP2
EXT SYNC
NO SSFM
SSFM
SYNC/SSFM
1 3 5 6
4 2
JP4
HDR
EXT/ON
INT
RP
1 3 4
2
R8
100k
R15 100k
TP4 INJ1
E1
VIN
C4 0.47uF 100V 0805
+
C24 47uF
EEEHA1J470UP
63V
12
R7
1M
0603
C16 1uF
VR1 100k
3314J-1-104E
1 3
2
TP3 INJ2
TP5
FAULT
_____
R4 16k 5%
R1 0.05 1206
L1 47uH
IHLE4040DDER470M5A
C19 OPT
INTVCC
VREF
VREF
INTVCC
VREF

10
DEMO MANUAL EVAL-LT8376-AZ
Rev. 0
 ANALOG DEVICES, INC. 2022
02/22
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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