Analog Devices Linear Technology DC2472A Guida rapida alla configurazione

dc2472af

DEMO MANUAL DC2472A

DESCRIPTION

18-CELL STIMULUS BOARD

Demonstration circuit 2472A is a USB-powered resistor-

string, voltage ladder with variable output. The DC2472A

provides a simple battery stack simulator for connection

directly to most of Linear Technology’s LTC68xx “battery

stack monitor” demo boards.

Using the 5V from a USB charger, the DC2472 generates

an isolated high voltage from ~25V to ~75V, applied to

a resistor string generating 18 voltages taps. These taps

provide a simulation of a string of series connected bat-

tery cells, each tap pair providing nominally the same

virtual cell voltage. The input voltage to the resistor string

is adjustable by an on-board potentiometer to furnish a

divided output voltage in a range of about 1.5V-4.2V per

cell to demonstrate operation at conditions comparable

to a wide range of cell chemistries.

CONNECTION TO AN LTC68XX DEMO-BOARD

1. The back side of the DC2472A shows where the

LTC68xx demo board connectors should be attached.

Simply line up the finger contacts with the associated

screw terminal connector according to whether the

connector is a 16- or 19-contact model. The screws

for securing the connections should be facing the com-

ponent side of the DC2472A. Torque the 16- or 19-posi-

tion connections to 0.2-0.25Nm. A 22-contact adapter L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog

Devices, Inc. All other trademarks are the property of their respective owners.

(e.g. DC2701A) should be torqued to 0.22-0.25Nm.

See Figure 1 for example installations.

2. In the case of a 15-cell demo (e.g. for LTC6812), the

pinout requires every sixth tap pair to be shorted over.

To accomplish this, place JP19, JP20, and JP21 to the

“15” position. In all other usages, leave those jumpers

in the ‘18’position. Note that cell voltages will increase

20% with placement of jumpers in the “15” position

due to the reduced division factor.

3. A USB to USB MICRO-B cable (like non-Apple cell

phone charger) provides a simple means of powering

the DC2472A from a 1A USB charger (some computer

ports may not provide adequate current for stable

output levels). Alternatively, a 5V bench power supply

can be connected to the power input turrets (+5V &

+5V COM) with clip-leads. Note that the +5V connec-

tions are isolated with respect to the GND turret of the

DC2472A, so the +5V COM and GND cannot be used

interchangeably.

WARNING –THIS BOARD GENERATES VOLTAGE POTEN-

TIALS UP TO 80V

Design files for this circuit board are available at

http://www.linear.com/demo/DC2472A

Figure 1. Output Connection Options

Typical DC2701 Adapter UsageTypical 12-Cell Demo Typical 15- or 18-Cell Demo

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dc2472af

DEMO MANUAL DC2472A

QUICK START PROCEDURE

1. Power up the DC2472A from the USB cable or bench

supply.

2. Once powered, the Blue LED1 should illuminate.

3. Adjust potentiometer to provide a desired equivalent

cell voltage as shown in Figure 2. Note that there will

be some variation in voltages amongst “cells” due to

component tolerances.

4. Operate the LTC68xx demo as applicable. Note that

resistor-string battery simulations (and DC2472A in

particular) cannot generally generate currents suitable

for properly demonstrating cell-balancing activity.

5. Jumpers JP0 through JP18 may be used to discon-

nect particular tap signals for demonstrating ‘open-

wire’ scenarios. Relocating a particular jumper to the

NC position will disconnect a cell path to simulate a

broken connection.

Figure 2. Cell Voltage Setting

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dc2472af

DEMO MANUAL DC2472A

THEORY OF OPERATION

The DC2472A is a resistor-string voltage-divider ladder

in Figure 3 and shows the key functional elements. The

heart of the circuit is an LT8302 isolated flyback converter

that produces both about 40V and 80V from a 5V source

such as a USB charger. The source 5V does not share

a galvanic connection to the equivalent cell-stack being

simulated so that many units can be operated without any

‘ground-loop’ fault currents. The 40V powers an LT6650

amplifier whose 15V output is scaled by a potentiometer

to create a variable voltage. The variable voltage is ampli-

fied 5x by an LTC6090 op amp that is powered from the

80V. The LTC6090 drives an 18-tap resistor ladder to

generate the equivalent series-connected cell voltages.

Each tap pair includes a significant capacitance to pro-

vide steady voltage in the presence of digitizing activity

by the demo board that is being powered. The amplifier

is decoupled and stabilized to operate with the capacitive

load but can still quickly respond to larger load demands

(i.e. the supply dynamics of the battery monitoring cir-

cuit being powered). To also support 6-cell and 12-cell

demonstrations, LTC6090 op amps also buffer 1/3 and

2/3 of the main LTC6090 voltage to provide stabilization

at those points in the ladder that might have to supply

current to a monitoring demo. To support a 15-cell demo,

every 6th cell divider can be shorted over with a jumper

(note that 15-cell demo circuits are designed to accept

their cell inputs in a compatible pinout with 3 zero-volt

cells). The lower voltage LTC6090 units include voltage

reduction Zener diodes to minimize heating of the IC die

if driving load current.

ISOLATED

FLYBACK

DC/DC

CONVERTER

15V

REFERENCE

VARIABLE

ATTENUATOR

AMPLIFIER

A=5

w/CLOAD

COMP.

AMPLIFIER

A=1

w/CLOAD

COMP.

AMPLIFIER

A=1

w/CLOAD

COMP.

3 RESISTOR STRING

15/18 RESISTOR STRING

18 TAPS

5V 80V 25V-75V TAP18

TAP12TAP6

Figure 3. Block Diagram of the DC2472A

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dc2472af

DEMO MANUAL DC2472A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0717 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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