ICS1702EB Galaxy Power, Inc., ICS1702EB Datasheet

ICS1702EB

Manufacturer Part Number

ICS1702EB

Description

Ics1702 Evaluation Board.

Manufacturer

Galaxy Power, Inc.

Datasheet

1.ICS1702EB.pdf (7 pages)

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ICS1702 Evaluation Board

General Description

Galaxy Power, Inc.'s ICS1702 Evaluation Board allows quick

evaluation of the ICS1702 Charge Controller for Nickel-Cadmium

and Nickel-Metal Hydride Batteries. The evaluation board provides

the designer an opportunity to both test the ICS1702 and a fast

charge battery charger. The board is self-contained and can provide

a constant current to charge a battery when optional components

are installed.

The board includes resistors that are user-installed to customize

operation for the desired charge rate, discharge pulse current, and

number of cells in the battery pack. The board has a 5V regulator

that provides power to the ICS1702 and the LED display. The

board also has a breadboarding area consisting of a matrix of holes

for user added components.

Before using Galaxy Power, Inc.'s ICS1702 Evaluation Board,

ICS recommends the user review the ICS1702 data sheet to

become familiar with the operation of the controller.

The ICS1702EB can be purchased two ways: ICS1702EB or

ICS1702EB/CR. The difference between these boards is a constant

current linear supply as shown in the board schematic. The

ICS1702EB has an area on the board reserved for these

components. The ICS1702EB/CR contains a kit which includes an

LM317 and associated parts needed to build a current regulator

Setting-up the Board for your

Application

Refer to the evaluation board schematic diagram. The ICS1702

requires that the battery voltage is normalized to the voltage of one

cell, or about 1.2V. To do this, resistors must be installed in the

locations marked R6 and R8. The appropriate values can be

selected from Table 1. An assortment of resistors is provided with

the board.

If the evaluation board is used with battery packs containing more

than eight cells, the resistors can be determined by counting the

number of cells to be charged in series. Then choose either R6 or

R8 and solve for the other resistor using:

R7 sets the open circuit (no battery) reference voltage at the

OPREF pin voltage. The purpose of this voltage reference is to

detect the removal of the battery from the charging system. The

voltage at this pin is compared to the voltage at the VIN pin when

the current source is turned on. If the voltage at VIN is greater than

the voltage at OPREF, the ICS1702 assumes the battery has been

removed and the ICS1702 enters the polling detect mode. For

proper operation, the voltage at OPREF must be set between the

(divided down) open circuit voltage produced by the current source

and the maximum normalized battery. As a guide, set the voltage at

OPREF (TP1) to be 200mV to 300mV higher than the maximum

normalized battery voltage. For most batteries, the maximum

normalized battery voltage at full charge is 1.7 to 1.8V, so OPREF

(TP1) should be set at about 2V.

When power is applied to the board, the controller will start a

charge sequence unless a logic low is applied to the RESET

terminal. When RESET is removed by a logic high or open, a

charge sequence will begin.

R8 = R6* (# of cells -1) or R6 =

Cells

Table 1

Open

2.0k

1.0k

3.0k

2.0k

1.3k

ICS1702EB

(# of cells -1)

Short

2.0k

3.0k

9.1k

12k

10k

12k

Related parts for ICS1702EB

ICS1702EB Summary of contents

Page 1

... The ICS1702EB can be purchased two ways: ICS1702EB or ICS1702EB/CR. The difference between these boards is a constant current linear supply as shown in the board schematic. The ICS1702EB has an area on the board reserved for these components. The ICS1702EB/CR contains a kit which includes an LM317 and associated parts needed to build a current regulator ...

Page 2

ICS1702 Evaluation Board The board provides several low value resistors that may be used to set the amplitude of the discharge pulse. The resistors can be installed in any or all of the locations labeled R1, R2, or R3. The ...

Page 3

... Current Regulator (CR option) or both methods The ICS1702EB/CR contains an LM317 regulator. The LM317 is configured as a constant current source. The amplitude of the current is determined by the value of R15 and the setting of R16 example, with a 2 ohm resistor for R15, the current can be adjusted with R16 from 0.625A to 1.25A. The LM317 will regulate a voltage difference of 1 ...

Page 4

ICS1702 Evaluation Board If either direct maintenance or the condition mode is selected, the MAINT LED will turn on. The LED will remain on until a reset is issued either by interrupting the power, removing the batteries or depressing the ...

Page 5

... Galaxy Power Incorporated wants to help create a successful battery charging solution using the ICS1702. If you need technical advice or applications information, call the Intelligent Charging Solutions hotline at (610) 676-0188 x-277. Ordering Information ICS1702EB /CR Ordering Option Device type blank=populated board /CR=populated board with regulator kit ...

Page 6

ICS1702 Evaluation Board 6 ...

Page 7

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