Analog Devices SCP-LT3483-EVALZ Quick setup guide

DEMO MANUAL SCP-LT3483-EVALZ

Rev. 0

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

IN(MAX)

Max Input Voltage

OUT(MAX)

Max Output Voltage

Output capacitor rating limited

Replace for higher V

OUT

setting

–39

SW(LIM)

Switch Current Limit

200

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

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

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

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

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

, 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

. 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

BOT

TOP

MAX

OUT

Reference Designators

125kΩ

(internal to LT3483)

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.

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

PARTS LIST

ITEM

QTY

REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

PCB

ANALOG DEVICES 08_051144b

CAP CER 330PF 10% 50V X7R 0402

KEMET C0402C331K5RACTU

CAP CER 4.7UF 50V 10% X7R 1206

SAMSUNG CL31B475KBHNNNE

CAP CER 0.1UF 50V 10% X7R 0603

SAMSUNG CL10B104KB8NNNC

CAP CER C0G DIELECTRIC

AVX 04025A5R6CAT2A

CAP CER 10UF 25V 10% X5R 0805

SAMSUNG CL21A106KAYNNNE

INPUT

CONN-PCB MALE HEADER 3POS 2.54MM PITCH R/A GOLD

SULLINS PBC03SBAN

IND POWER SHIELDED WIREWOUND 0.658A/0.329A,

0.5766OHM/2.31OHM DCR

EATON SDQ12-150-R

OUTPUT

CONN FEMALE 3POS 2.54MM PITCH R/A GOLD

SULLINS PPPC031LGBN-RC

CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY STRAIGHT

2MM PITCH (Note 1)

MOLEX 53253-0370

RES PRECISION THICK FILM CHIP

PANASONIC ERJ-2RKF10R0X

RES THIN FILM PRECISION

TE CONNECTIVITY CPF0805B1M5E1

RES STANDARD THICK FILM CHIP JUMPER, FOR AUTOMOTIVE

VISHAY CRCW08050000Z0EA

R4, R6, R7

RES THICK FILM 0805 (Note 1)

N/A

RES THICK FILM CHIP, GENERAL PURPOSE

YAGEO RC0805JR-071ML

IC INVERTING MICROPWR DC/DC CONVERTER

LINEAR TECHNOLOGY LT3483ES6#PBF

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

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

FE MA LE

LT3483

MA LE 4.7UF

50V

5.6PF

50V

LT3483ES6#PBF

330PF

1.5M

DN I

15.21UH/60.84UH

0.1UF

50V

53253-0370

DN I

25V

10UF

1MEG C4 R7 C5

OUTPUT

VIO C

INPUT

VI OC

GN D

VO -

GN D

VI OC

VO -

GN D

V+ 3

2 4

SHDN_N

VIN

GND

DEMO MANUAL SCP-LT3483-EVALZ

Rev. 0

12/20

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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