Analog Devices EVAL-LT8356-1-AZ Quick setup guide

1
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
DESCRIPTION
LT8356-1
100VIN/120VOUT LED
Controller with SSFM
Evaluation board EVAL-LT8356-1-AZ is a high voltage
LED controller featuring the LT
®
8356-1. It is assembled
as a buck-boost mode LED driver but can be altered to a
boost LED driver by adjusting the FB network and LED-
connection. EVAL-LT8356-1-AZ drives a single string of
LEDs up to 36V at 1A when the input is between 8V and
36V. It has an undervoltage lockout (UVLO) set at 6.5V
falling and 7.5V rising. The evaluation board features
PWM dimming, analog dimming, shutdown, open LED
and short LED fault protection and reporting.
EVAL-LT8356-1-AZ runs at 250kHz switching frequency
and features spread spectrum frequency modula-
tion(SSFM) modulating its switching frequency from
250kHz to 310kHz to reduce EMI emissions. Small ceramic
input and output capacitors are used to save space and
cost. A high voltage 100V external power switch and 100V
catch diode are used for up to 36W buck-boost mode
output as assembled. The open LED overvoltage protec-
tion (OVP) uses the IC’s constant voltage regulation loop
to limit the LED+ to LED–voltage to approximately 41V if
the LED string is opened. The VOUT, if referenced to GND,
will jump to VIN + 41V if the LED string is opened.
The input and output filters on EVAL-LT8356-1-AZ help
further reduce its EMI. These filters consist of a small
ferrite bead or inductor and high frequency ceramic
capacitors. A small resistor on the gate pin of the power
MOSFET is used to reduce high frequency EMI. 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-LT8356-1-AZ. For
best efficiency and PWM dimming performance, the EMI
filters can be removed. All registered trademarks and trademarks are the property of their respective owners.
The LT8356-1’s integrated PWMTG high-side PMOS
driver assists with PWM dimming of the connected LEDs.
The LED string can be PWM-dimmed for accurate bright-
ness control with an externally generated PWM signal
for highest achievable dimming ratio. It can also utilize
LT8356-1’s internally generated PWM feature for up to
128:1 exponential dimming. When running PWM dim-
ming, 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. The LT8356-1
uses CTRL and IADJ pins for two-pin analog dimming.
The input undervoltage lockout (UVLO), LED current,
output overvoltage protection (OVP), and switching
frequency, can all be easy adjusted with simple resis-
tor changes to EVAL-LT8356-1-AZ. Modifications can be
made to convert the board from buck-boost mode LED
driver to boost and buck mode LED Driver, and maintain
low EMI, PWM dimming and fault diagnostic features.
Buck mode and boost LED Driver schematics are pro-
vided in the data sheet. Please consult the data sheet
or the applications team regarding how to customize
EVAL-LT8356-1-AZ.
The LT8356-1 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 evaluation board EVAL-LT8356-1-AZ. The
LT8356IUDCM-1 is assembled in a 20-lead side sol-
derable plastic QFN 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-LT8356-1-AZ
Rev. A
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITION MIN TYP MAX UNITS
Input Voltage PVIN Range Operating 8 36 V
Switching Frequency (fSW, SSFM ON) R6 = 110k 250 310 kHz
ILED RS2 = 0.25Ω, 8V < PVIN < 36V, VLED ≤ 36V,
CTRL and ADJ Turrets = Float
1 A
Open LED Protection (LED+ to LED–) R8 = 10k, R20 = 10k, R22 = 340k 41 V
Peak Efficiency (SSFM ON) PVIN = 12V, VLED = 36V, ILED = 1A with Filters
PVIN = 12V, VLED = 36V, ILED = 1A without Filters
91.5
92
%
%
Peak Switch Current Limit RS1 = 0.01Ω 10 A
Internally-Generated PWM Dimming Range 0.5V < VPWM < 1.5V 1/128 100 %
Internally-Generated PWM Dimming Frequency R6 = 110k 260 Hz
PVIN Undervoltage Lockout (UVLO) falling R4 = 499k, R5 = 127k 6.5 V
PVIN Enable Turn-On (EN) rising R4 = 499k, R5 = 127k 7.5 V
BOARD PHOTO

3
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
QUICK START PROCEDURE
Evaluation board EVAL-LT8356-1-AZ is easy to set up
to evaluate the performance of the LT8356-1. Follow the
procedure below:
1. With power off, connect a string of LEDs that will run
with forward voltage less than or equal to 36V(at 1A)
to the LED+ and LED– (buck-boost) turrets on the PCB
as shown in Figure1.
2. With power off, connect the input power supply to the
PVIN and GND turrets. Make sure that the DC input
voltage will not exceed 36V.
3. Turn the input power supply on and make sure the
voltage is between 8V and 36V for proper operation
at max LED current.
4. Observe the LED string running at the programmed
LED current.
5. To change the brightness with analog dimming, the
CTRL and IADJ pins are used. The product of the offset
CTRL and IADJ pin voltages set the current when the
two voltages vary between 0.5V and 1.5V. Please refer
to data sheet for more details.
6. To changethe brightnesswith externalPWM dimming,
attach a rectangular waveform with varying duty cycle
to the PWM turret. The ON and OFF voltages should
be above 1.6V and below 0.4V, respectively.
7. To change the brightness with internally generated
PWM dimming, adjust the voltage at the PWM pin
between 0.5V and 1.5V to vary the duty ratio of the
internal PWM generator.
Figure1. Setup Drawing for EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver
(*See Boost LED Driver Setup Section for More Information on Boost-Only Topology)

4
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
BOOST LED DRIVER SETUP
EVAL-LT8356-1-AZ is assembled as a buck-boost mode
LED Driver, but with minor adjustments can be reconfig-
ured as a boost LED driver. In buck-boost mode, the LED
connection is at VIN, and a level shifter is used for the FB
network. In a boost LED Driver, the LED- connection is
at GND and a resistor divider is used for the FB network.
To configure EVAL-LT8356-1-AZ as a boost LED driver,
remove R20, R22, Q3, FB2, C12 and C11. Install 0Ω for
R14 and 1M for R9. Consult the data sheet for OVP cal-
culations and details about the FB pin. Connect the LED
string from LED+ to LED–(GND boost) as seen inFigure2.
Note that when EVAL-LT8356-1-AZ is reconfigured
as a boost LED Driver, other components may need
to be adjusted depending on their voltage rating and
powercapabilities.
Figure2. EVAL-LT8356-1-AZ as a Boost LED Driver

5
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
TEST RESULTS
Figure3. EVAL-LT8356-1-AZ as Buck-Boost Mode LED
Driver Efficiency vs Input Voltage
Figure4. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver
Internal 260Hz 2% PWM Dimming with EMI Filters and
SSFMON: 12VIN, 36VLED, 1A
Efficiency vs VIN
f
SW
= 250kHz
SSFM = ON
I
LED
= 1A
V
LED
= 36V
WITH EMI FILTERS
WITHOUT EMI FILTERS
INPUT VOLTAGE (V)
8
12
16
20
24
28
32
36
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
EVAL-83561 F03
Internal PWM Dimming
20µs/DIV
V
SW
50A/DIV
PWMTG
50V/DIV
I
L
5A/DIV
I
LED
1A/DIV
EVAL-83561 F04
2µs/DIV
I
LED
1A/DIV
EVAL-83561 F05
500:1
1,000:1
2,000:1
5,000:1
External PWM Dimming
Figure5. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver
External 150Hz PWM Dimming with EMI Filters and SSFM ON:
12VIN, 36VLED, 1A
Figure6. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver:
50% to 100% to 50% Load Step Transient Response, 12VIN
Transient Response
f
SW
= 250kHz
SSFM = ON
500µs/DIV
ILED
500mA/DIV
V
CTRL
500mV/DIV
EVAL-83561 F06

6
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
Figure7. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver Board
Thermal Image with Filters and SSFM ON: 12VIN, 36VLED, 1A
TEST RESULTS

7
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
Figure8. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver Conducted Emissions (Voltage Method): 12VIN, 36VLED, 1A (SSFM ON)
Figure9. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver Conducted Emissions (Current Method): 12VIN, 36VLED, 1A (SSFM ON)
Figure10. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver Radiated Emissions: 12VIN, 36VLED, 1A (SSFM ON)
(a) CISPR25 Peak Conducted EMI – Voltage Method (b) CISPR25 Average Conducted EMI – Voltage Method
(a) CISPR25 Peak Conducted EMI – Current Method (b) CISPR25 Average Conducted EMI – Current Method
(a) CISPR25 Peak Radiated EMI (b) CISPR25 Average Radiated EMI
TEST RESULTS
CLASS 5 PEAK LIMIT
EVAL-LT8356-1-AZ
EVAL-LT8356-1-AZ + SHIELD
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–20
–10
0
10
20
30
40
50
60
70
80
PEAK CE (dBµV)
EVAL-83561 F08a
CLASS 5 AVERAGE LIMIT
EVAL-LT8356-1-AZ
EVAL-LT8356-1-AZ + SHIELD
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–20
–10
0
10
20
30
40
50
60
70
80
AVERAGE CE (dBµV)
EVAL-83561 F08b
CLASS 5 PEAK LIMIT
EVAL-LT8356-1-AZ
EVAL-LT8356-1-AZ + SHIELD
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
PEAK CE (dBµA)
EVAL-83561 F09a
CLASS 5 AVERAGE LIMIT
EVAL-LT8356-1-AZ
EVAL-LT8356-1-AZ + SHIELD
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
AVERAGE CE (dBµA)
EVAL-83561 F09b
CLASS 5 PEAK LIMIT
EVAL-LT8356-1-AZ
EVAL-LT8356-1-AZ + SHIELD
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
1000
–20
–10
0
10
20
30
40
50
60
PEAK RE (dBµV/m)
EVAL-83561 F10a
CLASS 5 AVERAGE LIMIT
EVAL-LT8356-1-AZ
EVAL-LT8356-1-AZ + SHIELD
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
1000
–20
–10
0
10
20
30
40
50
60
AVERAGE RE (dBµV/m)
EVAL-83561 F10b

8
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
EMISSIONS SHIELD (OPTION)
For the lowest emissions, an EMI shield can be attached to
EVAL-LT8356-1-AZ. The PCB was fabricated with place-
holders for six shield clips that can hold a 44mm×44mm
metal shield. Part number for an example shield can
be found in the Parts List section in the Optional EMI
Figure11. EVAL-LT8356-1-AZ Top Silkscreen Outlining Placement of Shield Clips and EMI Shield on PCB
Filter Components section. The Top silkscreen picture,
Figure11, shows the placeholders for the six surface
mount shield clips. Emissions can be tested with and
without the removable clip-shield.

9
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C7 CAP., 10μF, X7S, 50V, 10%, 1210, AEC-Q200, NO SUBS ALLOWED MURATA, GCM32EC71H106KA03L
2 1 C5 CAP., 68μF, ALUM ELECT, 50V, 20%, 6.3mm × 7.7mm, SMD,
RADIAL, AEC-Q200
PANASONIC, EEEFN1H680XP
3 1 C6 CAP., 4.7μF, X5R, 10V, 10%, 0603, AEC-Q200 TAIYO YUDEN, LMK107BJ475KAHT
4 1 C8 CAP., 1μF, X7R, 50V, 10%, 0805, AEC-Q200 MURATA, GCM21BR71H105KA03L
5 1 C9 CAP., 1000pF, X7R, 50V, 10%, 0402, AEC-Q200 MURATA, GCM155R71H102KA37D
6 1 C12 CAP., 10μF, X7S, 50V, 10%, 1210, AEC-Q200 MURATA, GCM32EC71H106KA03L
7 1 C13 CAP., 4.7μF, X7S, 100V, 10%, 1210, AEC-Q200 MURATA, GCM32DC72A475KE02L
8 1 C16 CAP., 2.2μF, X6S, 10V, 10%, 0402, AEC-Q200 MURATA, GRT155C81A225KE13D
9 1 C19 CAP., 2.2μF, X5R, 25V, 10%, 0603, AEC-Q200 TAIYO YUDEN, TMK107BBJ225KAHT
10 1 D1 DIODE, SCHOTTKY, 100V, 3A, POWERDI5, AEC-Q101 DIODES INC., PDS3100Q-13
11 1 L2 IND., 15μH, PWR, SHIELDED, 20%, 13.8A, 18.6mΩ,
11.8mm × 10.5mm, XAL1010, AEC-Q200
COILCRAFT, XAL1010-153MEB
12 1 M1 XSTR., MOSFET, N-CH, 100V, 37A, PowerPAK SO-8L, AEC-Q101 VISHAY, SQJA72EP-T1_GE3
13 1 M2 XSTR., MOSFET, P-CH, 100V, 33.6A, PowerPAK SO-8L, AEC-Q101 VISHAY, SQJ211ELP-T1_GE3
14 1 Q3 XSTR., PNP, 100V, 1A, SOT-23-3, AEC-Q101 DIODES INC., FMMT593QTA
15 4 R1, R2, R12, R25 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
16 1 R4 RES., 499k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402499KFKED
17 1 R5 RES., 127k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402127KFKED
18 1 R6 RES., 110k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603110KFKEA
19 1 R7 RES., 16k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040216K0JNED
20 2 R8, R20 RES., 10k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0FKED
21 1 R19 RES., 10Ω, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210R0JNED
22 1 R22 RES., 340k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402340KFKED
23 1 RS1 RES., 0.01Ω, 1%, 1.5A, 1206, LONG-SIDE TERM., METAL,
SENSE, AEC-Q200
SUSUMU, KRL3216E-C-R010-F-T1
24 1 RS2 RES., 0.25Ω, 1%, 1/2W, 1206, SENSE, AEC-Q200 YAGEO, PT1206FR-7W0R25L
25 1 U1 IC, LED DRIVER CTRLR, QFN-20 ANALOG DEVICES, LT8356IUDCM-1#WPBF
Optional EMI Filter Components
26 1 C3 CAP., 10μF, X7S, 50V, 10%, 1210, AEC-Q200,
NO SUBS ALLOWED
MURATA, GCM32EC71H106KA03L
27 1 C11 CAP., 0.1μF, X7R, 50V, 10%, 0603, AEC-Q200 TDK, CGA3E2X7R1H104K080AA
28 1 C18 CAP., 0.1μF, X7S, 100V, 10%, 0603, AEC-Q200 TDK, CGA3E3X7S2A104K080AB
29 2 FB1, FB2 IND., 330Ω AT 100MHz, FERRITE BEAD, 25%,
1.8A, 80mΩ, 0805, 1LN
TAIYO YUDEN, FBMH2012HM331-T
30 1 L1 IND., 4.7μH, PWR, SHIELDED, 20%, 11A, 14.4mΩ,
6.76mm × 6.56mm, XAL6060, AEC-Q200
COILCRAFT, XAL6060-472MEB
31 1 R10 RES., 10Ω, 5%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060310R0JNEA
32 0 FB3-FB5 IND., OPTION, FERRITE BEAD, 1210
33 0 C1 CAP., OPTION, 0402

10
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
34 0 C2 CAP., OPTION, 1206
35 0 C4 CAP., OPTION, 1210
36 0 C10, C17 CAP., OPTION, 0603
37 0 CL1-CL6 OPTION, WE-SHC CABINET CLIP 6.5mm × 0.8mm × 1.27mm WURTH, 369 000 00
38 0 SH1 OPTION, WE-SHC CABINET SHIELD 44.37mm × 44.37mm WURTH, 369 074 06S
Optional Electrical Components
39 0 C1, C23-C25 CAP., OPTION, 0402
40 0 C4, C14, C20-C22 CAP., OPTION, 1210
41 0 C15 CAP., OPTION, ALUM. ELECT., SMD
42 0 D2, D3 DIODE, OPTION, SOD-323F
43 0 R3, R11, R13, R14, R18,
R21, R23, R24, R26
RES., OPTION, 0402
44 0 R9 RES., OPTION, 0603
Hardware: For Demo Board Only
45 7 E1-E7 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0
46 4 E8-E11 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0
47 2 J1, J2 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,
SWAGE, 0.218
KEYSTONE, 575-4
48 4 MH1-MH4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833
PARTS LIST

11
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
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 5%, 0402. 2. ALL CAPACITORS 0402 NOTES: UNLESS OTHERWISE SPECIFIED.
GND
8V - 36V
PVIN
250kHz
V1 V2
I2
I1
Vo
INTVCC
VIN
VREF
VREF
TP14
E4
LED-
GND BOOST
R24 OPT
RS1 0.01
KRL3216
R19
10
R2
100k
U1
LT8356-1
EN/UVLO
1
GND 2
INTVCC
3
VC
4
CTRL
5
FB 6
ISN 7
ISP 8
SENSE 10
GATE 11
PWMTG 13
FAULT
14
IADJ
15
PWM 16
VREF
17
RT
18
VIN 20
GND 21
E7
M1 SQJA72EP
52
4
1
3
C16
2.2uF 10V
C20 OPT 1210
R23
OPT
C10 OPT
0603
R9 OPT 0603
R14 OPT
R26
OPT
L1
4.7uH
XAL6060-472MEB
C21 OPT 1210
FB3 OPT
TP16 VEXT
C11 0.1uF 50V 0603
R25
100k
J2
R3 OPT
FB4 OPT
R8
10k 1%
TP15
SGND
TP5
FAULT
_____
C19
2.2uF
0603
FB5 OPT
C25 OPT
J1
TP8
VC
E10 PWM
C12 10uF 50V 1210
C13 4.7uF 1210 100V
D2
OPT
SOD-323F
E2
OUT
RS2 0.25
1206
TP9
R4
499k
R12
100k
R21 OPT
R10
10
0603
E9
IADJ
C22 OPT 1210
R18 OPT
+
C15 OPT E3
LED+
36VLED
1A
R5 127k
D3
OPT
SOD-323F
R7 16k
C6 4.7uF 0603 10V
R22 340k 1%
C14 OPT 1210
E11
GND
TP11
+
C5 68uF 50V
EEEFN1H680XP
TP1
VREF
C23 OPT 0402
C7 10uF 1210 50V
FB1
FBMH2012HM331-T
R6
0603
110K
1%
R20
10k
1%
R13
OPT
D1
PDS3100Q
21 3
TP10
TP6
INTVCC
C1 OPT
C9 1000pF
C3
10uF 1210
50V
Q3 FMMT593Q
3 2
1
C8 1uF 0805 50V
C24 OPT 0402
TP12
M2
SQJ211ELP
52
4
1 3
FB2
FBMH2012HM331-T
C17
OPT
0603
C2 OPT 1206
R1
100k
L2
15uH
XAL1010-153MEB
12
E5
GND
C4 OPT 1210
E1
LED-
BUCK-BOOST
TP13
E8
CTRL
TP4
EN
E6
C18 0.1uF 100V
0603
R11
OPT
SW
VREF
FB
OUT
VIN
FB
INTVCC
INTVCC
OUT
VREF
VIN SW

12
DEMO MANUAL EVAL-LT8356-1-AZ
Rev. A
 ANALOG DEVICES, INC. 2022
08/22
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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BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.