Analog Devices SCP-LT3483-EVALZ Quick setup guide

DEMO MANUAL SCP-LT3483-EVALZ
Rev. 0
1
DESCRIPTION
Demonstration circuit SCP-LT3483-EVALZ is an inverting
converter featuring the LT3483ES6. The converter gener-
ates –15V at 8mA to 40mA from a 2.7–12V input using a
dual coupled inductor in an inverting flyback topology.
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
LT 3 4 83 buck regulator. Please refer to the LT 3 4 83
datasheet for a complete 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
16
V
V
OUT(MAX)
Max Output Voltage
Output capacitor rating limited
Replace for higher V
OUT
setting
–39
V
I
SW(LIM)
Switch Current Limit
200
mA
BOARD IMAGE
Figure 1. SCP-LT 3 4 8 3 -EVALZ Board
DEMO MANUAL
SCP-LT3483-EVALZ
Signal Chain Power
LT3483 Inverting Converter

DEMO MANUAL SCP-LT3483-EVALZ
Rev. 0
2
QUICK START PROCEDURE
Demonstration circuit SCP-LT3483-EVALZ is easy to set
up to evaluate the performance of any SCP hardware
configuration. Refer to Figure 2 and follow these steps :
1. The SCP-LT3483-EVALZ ships with a default output
voltage of –15V. 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
“Configuration Settings” section, and modify the board
accordingly. Be sure to check for open connections or
solder shorts after making any modifications.
2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUT-
EVALZ boards to the SCP-LT3483-EVALZ board (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-LT3483-EVALZ into regulation and sweep
V
SOURCE
through the desired range of operation.
NOTE: Make sure that the input voltage is always within
specification. If using a dynamic load to measure out-
put voltage, 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-LT3483-EVALZ
Rev. 0
3
CONFIGURATION SETTINGS
Demonstration circuit SCP-LT3483-EVALZ is an inverting
converter featuring the LT3483ES6. The converter gener-
ates –15V at 8mA to 40mA from a 2.7–12V input using a
dual coupled inductor in an inverting flyback topology.
The output of the SCP-LT3483-EVALZ is resistor-program-
mable from –1V to –39V. T h e b o a r d c a n b e also configured
to drive VIOC-capable linear regulators.
OUTPUT VOLTA G E PROGRAMMING
!
Table 2. Resistor selection guide for common output voltages
V
OUT
(V)
R2 (Ω)
–1.0V
100k
–1.5V
150k
–2.0V
200k
–2.5V
249k
–3.0V
301k
–3.5V
348k
–4.0V
402k
–4.5V
453k
–5.0V
499k
–5.5V
549k
–6.0V
604k
–7.0V
698k
–8.0V
806k
–9.0V
909k
–10.0V
1.00M
–11.0V
1.10M
–12.0V
1.21M
–13.0V
1.30M
–14.0V
1.40M
–15.0V
1.50M
–16.0V
1.62M
–17.0V
1.69M
–18.0V
1.82M
–19.0V
1.91M
–20.0V
2.00M
–25.0V
2.49M
–30.0V
3.01M
–35.0V
3.48M
–39.0V
3.92M
SHDN PIN CONFIGURATION
The SHDN pin is tied to the optional SCP Run/Sequence
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 resistor for either
pull-up or pull-down resistors R5 and R6, short R4 with
0 W , and use the drive signal from connector P1.
VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC)
IMPLEMENTATION
To implement the VIOC function for this regulator, set R7
to 0 W . Refer to the “Configuration Settings” section in the
Demo Manual for the low-dropout (LDO) linear regulator
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
125kΩ
(internal to LT3483)
R2
R3
!
!
Because the V
LDOIN
term is simply the sum of the final
output voltage after the LDO and the difference the LT3483
is adding on top, it can be helpful to take the desired final
output voltage, add 1.0V, and then look up that voltage-
resistor combination from Table 2.
R
MAX
can then be obtained by figuring out the difference
between the maximum and nominal output voltages of the
LT 3 4 8 3 , d i v i d e d b y t h e 1 0 µA current through the internal
feedback resistor.
VOUT =R2•10µA
VL DOIN −VL DOOUT =VVIOC =1 .2 5 VREF
RTOP
RBOT
⎛
⎝
⎜⎞
⎠
⎟
VMAX
( )
L DOIN =1 .2 5 VREF
RTOP +RMAX
RBOT
⎛
⎝
⎜⎞
⎠
⎟+VVIOC
RMAX
4 0 k
⎛
⎝
⎜⎞
⎠
⎟

DEMO MANUAL SCP-LT3483-EVALZ
Rev. 0
4
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
1
PCB
PCB
ANALOG DEVICES 08_051144b
2
1
C1
CAP CER 330PF 10% 50V X7R 0402
KEMET C0402C331K5RACTU
3
1
C2
CAP CER 4.7UF 50V 10% X7R 1206
SAMSUNG CL31B475KBHNNNE
4
1
C3
CAP CER 0.1UF 50V 10% X7R 0603
SAMSUNG CL10B104KB8NNNC
5
1
C4
CAP CER C0G DIELECTRIC
AVX 04025A5R6CAT2A
6
1
C5
CAP CER 10UF 25V 10% X5R 0805
SAMSUNG CL21A106KAYNNNE
7
1
INPUT
CONN-PCB MALE HEADER 3POS 2.54MM PITCH R/A GOLD
SULLINS PBC03SBAN
8
1
L1
IND POWER SHIELDED WIREWOUND 0.658A/0.329A,
0.5766OHM/2.31OHM DCR
EATON SDQ12-150-R
9
1
OUTPUT
CONN FEMALE 3POS 2.54MM PITCH R/A GOLD
SULLINS PPPC031LGBN-RC
10
1
P1
CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY STRAIGHT
2MM PITCH (Note 1)
MOLEX 53253-0370
11
1
R1
RES PRECISION THICK FILM CHIP
PANASONIC ERJ-2RKF10R0X
12
1
R2
RES THIN FILM PRECISION
TE CONNECTIVITY CPF0805B1M5E1
13
1
R3
RES STANDARD THICK FILM CHIP JUMPER, FOR AUTOMOTIVE
VISHAY CRCW08050000Z0EA
14
3
R4, R6, R7
RES THICK FILM 0805 (Note 1)
N/A
15
1
R5
RES THICK FILM CHIP, GENERAL PURPOSE
YAGEO RC0805JR-071ML
16
1
U1
IC INVERTING MICROPWR DC/DC CONVERTER
LINEAR TECHNOLOGY LT3483ES6#PBF
17
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-LT3483-EVALZ
Rev. 0
5
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.
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
NC
FE MA LE
FE MA LE
NC
LT3483
MA LE 4.7UF
50V
50V
5.6PF
50V
LT3483ES6#PBF
330PF
1.5M
DN I
DN I
DN I
15.21UH/60.84UH
0.1UF 50V
53253-0370
DN I
25V 10UF
0
10
1MEG C4 R7 C5
U1
R2
R6
OUTPUT
C3
VIO C
P1
R3
R1
C1
L1
R5
R4
C2
INPUT
VI OC
GN D
GN D
VO -
GN D VI OC EN
VO - GN D
EN
V+ 3
3
3 2 4
5
6
1
2
3 2 1 1 2 3 2 1
4
2
1
1
SHDN_N
D
FB
VIN
GND
SW

DEMO MANUAL SCP-LT3483-EVALZ
Rev. 0
6
12/20
www.analog.com
© ANALOG DEVICES INC. 2020
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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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