Analog Devices Linear SCP-LT8362-S-EVALZ Quick setup guide

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
1
DESCRIPTION
Demonstration circuit SCP-LT8362-S-EVALZ features the
LT 8 3 6 2 in a SEPIC configuration. It operates with a switch-
ing frequency of 2MHz and has an output voltage of 12V.
Like all boards in the Signal Chain Power series, this board
is designed to be easily plugged into other SCP boards to
form a complete signal chain power system, enabling fast
evaluation of low power signal chains. To evaluate this
board, some universal SCP hardware is required, namely:
SCP-INPUT-EVALZ SCP-FILTER-EVALZ
SCP-OUTPUT-EVALZ SCP-1X2BKOUT-EVALZ
SCP-1X5BKOUT-EVALZ SCP-5X1-EVALZ
SCP-THRUBRD-EVALZ
To properly evaluate SCP series demo boards, you will
need the SCP Configurator companion software. SCP
Configurator can help you choose the right board and to-
pology for your design.
Note that this Demo Manual does not cover details im-
portant to the operation and configuration regarding the
LT8362. Please refer to the LT 8 3 6 2 d ata s h e e t for a com-
plete description of the part.
Design files for this circuit board are available.
All registered trademarks and trademarks are property of their respective owners.
Table 1. Performance Summary
SYMBOL
PARAMETER
NOTES
MIN
TYP
MAX
UNITS
V
IN(MAX)
Max Input Voltage
48
V
V
OUT(MAX)
Max Output Voltage
48
V
I
OUT(MAX)
Max Output Current
2
A
BOARD IMAGE
Figure 1. SCP-LT 8 3 6 2 -S-EVALZ Board
DEMO MANUAL
SCP-LT8362-S-EVALZ
Signal Chain Power
LT8362 Low I
Q
SEPIC Converter

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
2
QUICK START PROCEDURE
Demonstration circuit SCP-LT8362-S-EVALZ is easy to
set up to evaluate the performance of any SCP hard-
ware configuration.
1. The SCP-LT8362-S-EVALZ ships with a default output
voltage of 12V. To c h a n g e t h e o u t p u t v o l t a g e , s e e “ C o n -
figuration Settings” section, and modify the board ac-
cordingly. Be sure to check for open connections or sol-
der shorts after making any modifications.
2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUT-
EVALZ boards to the SCP-LT8362-S-EVALZ (refer to
Figure 2) and connect the input board to a voltage
source, V
SOURCE
. Connect the output board to a volt-
meter or dynamic load. Slowly raise the input voltage
until the SCP-LT8362-S-EVALZ powers up into regula-
tion and sweep V
SOURCE
through the desired range of
operation.
NOTE: Make sure that the input voltage is always within
spec. If using a dynamic load to measure output volt-
age, make sure the load is initially set to zero.
3. Check for proper output voltage. The output should be
regulated at the programmed value (±5%).
4. Once the proper output voltage is established, power
off V
SOURCE
and similarly test other boards in the SCP
system until all elements have been individually verified
prior to assembling into the final circuit configuration.
NOTE: When measuring the input or output voltage rip-
ple, use the optional SMA connector locations available
on the input, output, 1 ´ 5, 1 ´ 2, and 5 ´ 1 breakout
boards. Avoid using the test point connections with
long scope leads.
Figure 2. Proper Measurement Equipment Setup (Use SMA connectors for Measuring Input or Output Ripple)

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
3
CONFIGURATION SETTINGS
Demonstration circuit SCP-LT8362-S-EVALZ features the
LT 8 3 6 2 i n a SEPIC configuration. It operates with a switch-
ing frequency of 2MHz and has an output voltage of 12V.
The output of the SCP-LT8362-B-EVALZ is resistor-pro-
grammable from 5V to 48V. The board can be also config-
ured to drive VIOC-capable LDO regulators.
OUTPUT VOLTA G E PROGRAMMING
!
Table 2. Resistor Selection Guide for Common Output Voltages
V
OUT
(V)
R6 (Ω)
R8 (Ω)
5.0
24.3K
11.5K
6.0
31.6K
11.5K
7.0
115K
34.0K
8.0
102K
25.5K
9.0
118K
25.5K
10.0
105K
20.0K
11.0
107K
18.2K
12.0
71.5K
11.0K
13.0
97.6K
13.7K
14.0
78.7K
10.2K
15.0
115K
13.7K
16.0
102K
11.3K
17.0
162K
16.9K
18.0
205K
20.0K
19.0
150K
13.7K
20.0
115K
10.0K
21.0
243K
20.0K
22.0
255K
20.0K
23.0
226K
16.9K
24.0
140K
10.0K
25.0
215K
14.7K
30.0
442K
24.9K
35.0
287K
13.7K
40.0
255K
10.7K
45.0
374K
13.7K
48.0
309K
10.7K
EN/UVLO PIN CONFIGURATION
The EN/UVLO pin is tied to the optional SCP Run/Se-
quence header P1. To create a harness for this function,
use Molex part # 0510650300 with crimp pin # 50212-
8000.
To use an active run signal, use a 1.00M for either pull-up
or pull-down resistors R1 and R3, short R13 with 0 W , and
use the drive signal from connector P1.
If precision UVLO operation is desired, program enable di-
vider R5 and R6 such that:
!
!
The LT8330 has an accurate 1.60V threshold which places
the part into under voltage lockout. The hysteresis thresh-
old on the rising edge is typically 80mV and scales by the
factor:
!
VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC)
IMPLEMENTATION
To implement the VIOC function for this regulator, set R27
to 0 W . Refer to the “Configuration Settings” section in the
Demo Manual for the LDO board and use the following
configuration for this board.
Table 3. VIOC Cross-Reference Designators
VIOC SETTING REFERENCES
R
BOT
R
TOP
R
MAX
V
OUT
Reference Designators
R8
R6
R14
!
!
I
SINK
is the current through R
MAX
, typically 15µA, so R
BOT
should be sized such that the divider current runs a mini-
mum of 100µA to minimize the I
SINK
error term.
VOUT =1 .6 VFBX 1+R6
R8
⎛
⎝
⎜⎞
⎠
⎟
R6 =1 0 k −1 0 0 k,nominal
R5 =R6 VIN −1 .6 0 VTH
1 .6 0 VTH
⎛
⎝
⎜⎞
⎠
⎟
VHYST =80mV R5 +R6
R6
⎛
⎝
⎜⎞
⎠
⎟
VL DOIN −VL DOOUT =VVIOC =1 .6 0 VFB
RBOT +RTOP
RBOT
⎛
⎝
⎜⎞
⎠
⎟
VMAX
( )
LDOIN =1 .6 0 VFB
RBOT +RTOP +RMAX
RBOT
⎛
⎝
⎜⎞
⎠
⎟+ISINKRMAX

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
4
MODE PIN CONFIGURATION
The SCP-LT8362-B-EVALZ is configured by default for
Burst Mode at light loads for efficiency. The MODE pin can
also be configured to burst with spread spectrum, if de-
sired. The table below shows the various configurations
possible with the MODE pin.
Table 4. Settings for MODE Pin Configuration
MODE
R2
R4
R12
Burst Mode
0
W
Open
Open
Burst/Spread Spectrum
100k
Open
Open
Pulse Skip
Open
Open
Open
Pulse Skip/Spread Spectrum
Open
Open
0
W
Clock Sync/Pulse Skip
Open
0
W
Open
If the clock synchronization option is desired, the SCP-
LT8362-B-EVALZ can be driven from an external source
via the optional SMA connector J1.

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
5
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
1
PCB
PCB
ANALOG DEVICES 08_051143b
2
1
C1
CAP MULTILAYER CER, X7R
TAIYO YUDEN HMK316B7105KL-T
3
2
C11, C12
CAP CER 0.1UF 50V 10% X5R 0402
YAGEO CC0402KRX5R9BB104
4
1
C14
CAP ALUM 33UF 50V 20% 6.6X6.6MM
UNITED CHEMI CON
EMVH500ADA330MF80G
5
2
C2, C4
CAP CER 10UF 50V X5R 1206
SAMSUNG CL31A106MBHNNNE
6
1
C3
CAP MLCC 1206 (Note 1)
N/A
7
3
C5, C8, C13
CAP MLCC 0603 (Note 1)
N/A
8
1
C6
CAP CER X7R
WURTH ELEKTRONIK885012000000
9
2
C7, C10
CAP CER 1UF 50V 10% X5R 0603
SAMSUNG CL10A105KB8NNNC
10
1
C9
CAP CER X7R, GENERAL PURPOSE
WURTH ELEKTRONIK885012000000
11
2
D1, D2
DIO SCHOTTKY (Note 1)
N/A
12
1
D3
DIO SCHOTTKY BARRIER RECTIFIER, 2A
DIODES INCORPORATED DFLS260-7
13
1
INPUT
CONN-PCB MALE HEADER 3POS 2.54MM PITCH R/A GOLD
SULLINS PBC03SBAN
14
1
J1
CONN-PCB STRAIGHT SMA PCB DIE CAST (Note 1)
TE CONNECTIVITY LTD 5-1814832-1
15
1
L1
IND POWER WIREWOUND 1.25A, 0.146OHM DCR
WURTH ELEKTRONIK74489430068
16
1
L2
IND POWER (Note 1)
N/A
17
1
OUTPUT
CONN FEMALE 3POS 2.54MM PITCH R/A GOLD
SULLINS PPPC031LGBN-RC
18
1
P1
CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY STRAIGHT
2MM PITCH (Note 1)
MOLEX 53253-0370
19
1
R1
RES THICK FILM CHIP, GENERAL PURPOSE
YAGEO RC0805JR-071ML
20
1
R10
RES PRECISION THICK FILM CHIP
PANASONIC ERJ-6ENF2002V
21
3
R2, R12, R27
RES THICK FILM 0805 (Note 1)
N/A
22
2
R3, R13
RES THICK FILM 0805 (Note 1)
N/A
23
2
R4, R14
RES STANDARD THICK FILM CHIP JUMPER, FOR AUTOMOTIVE
VISHAY CRCW08050000Z0EA
24
1
R6
RES PRECISION THICK FILM CHIP
PANASONIC ERJ-6ENF1004V
25
1
R8
RES SMD 154K OHM 0.1% 1/8W 0805, AUTOMOTIVE
PANASONIC ERA-6AEB1543V
26
1
R9
RES PRECISION THIN FILM CHIP
VISHAY PAT0805E4022BST1
27
1
U1
IC LOW IQ BOSS/SEPIC/INVERTING CONVERTER WITH 2A, 60V
SW
LINEAR TECHNOLOGY LT8362EDD#PBF
28
1
VIOC
CONN FEMALE 2POS 2.54MM PITCH R/A GOLD
SULLINS PPPC021LGBN-RC
Note 1. These items are not stuffed (DNI).

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
6
SCHEMATIC DIAGRAM
JTAG
PULSE SKIPPING PULSE SKIPPING/SSFM
LT8362 SEPIC
FEMALE FEMALE
GND GND
BURST/SSFM-100KOHMBURST-0OHM;
SYNC
NC GND
MALE
5-1814832-1
53253-0370
0.22 UF
DNI
1UF 50V
50V0. 1UF 50V0. 1UF
DFLS260-7
DNI
10UF 10 UF
50V
PPPC031LGBN-RC
PPPC021LGBN-RC
0
DNI
0
DNI
1MEG
6.8UH
10 UF
1MEG
TBD0805 DNI
33UF
TBD0805
PBC03SBAN
DNI0
0
DNI TBD0603154K
1UF 50V
40.2K
1.5NF 25V
DNI TBD0603
20K
25V
0DNI
DNIDFLS260-7
DNI DFLS260-7
100V1UF
DNI
LT8362EDD#PBF
J VIERNES
02_051143 B
1:1
HW TYPE : SCP EVAL-Z
Product(s): LT8362
: LT8362
<DESIGN_VIEW>
3 4
6.8UH50V50 V
J1
P1
C12 C11
R15
D3
C3 C2
R2 4 R2 5 OU TPUT R2 6 R2 2 R2 1 R2 3
VIOC
R20R19R18R17R16
R27
R1 4
C5
R6
L1
C4
R1
R3
C14
R1 3
INPUT
R2 R4
C1 3R8
C7
R9
C9
C8
R 10
C6
R1 2
D2
D1
C1
L2
U1
C1 0
OUT
SYNC
RUN VO-
VO+
RUN
SYNC INTVCC
OUT
VIOC
V+
INTVCC
2 1 3
3 2 1
1 2
2
14 3
2 3 1
4
1 96
5
2
3
8 7
PAD
1 0
AGND
AGND
AGN D
AGN D
GND
SW
SYN C/MODE SS RT
FBX
VC
BIAS
INTVCC
VIN
EN/U VLO
AGN D
AGND
AGND
AGN D
AGND
AGND
AGND
AGN D
D
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DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
7
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.

DEMO MANUAL SCP-LT8362-S-EVALZ
Rev. 0
8
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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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