Texas Instruments DV2031S2 User manual

Features

äbq2031 fast-charge control evaluation and

development

äOnboard configuration for fast charge of 2, 3, 4 or 6

lead-acid cells; user-defined option allows other

configurations

äSelectable charge algorithms: Two-Step Voltage,

Two-Step Current, or Pulsed Current

äConstant current (up to 2.5A) and constant voltage

(up to 15V) provided by on-board switch-mode

regulator

äCharge termination by maximum voltage, second

difference of cell voltage, minimum current, or

maximum time-out

äDirect connections for battery, thermistor, and power

supply

äMTO is set for 3.1 hours

äJumper-configurable 3-LED display

General Description

The DV2031S2 Development System provides a develop-

ment environment for the bq2031 Lead-Acid Fast-

Charge IC. The DV2031S2 incorporates a bq2031 in a

buck-type switch-mode regulation mode to provide

fast-charge control for 2, 3, 4, or 6 lead-acid cells.

The DV2031S2 can be configured for three different

charge algorithms with jumpers JP1 and JP3. The

charge algorithms available are

Two-step voltage

Two-step current

Pulsed current

Each algorithm consists of pre-charge qualification, fast

charge, and maintenance charge periods.

Fast charge termination occurs on

Maximum voltage

The second difference of cell voltage (∆2V)

Minimum current

Maximum time-out

The maintenance charge may be configured for either a

regulated float voltage or a pulsed current.

The user provides a DC power supply and batteries

and configures the board for the number of cells, the

minimum current threshold, and the LED display

mode. The board has direct connections for the battery

and the provided thermistor.

Before using the DV2031S2 board, please review the

bq2031 data sheet (SLUS156) and the application note

entitled “Using the bq2031 to Charge Lead-Acid Bat-

teries” (SLUA017).

DV2031S2

SLUU023BDECEMBER 1998 REVISED MARCH 2007 Rev.BBoard

Lead-Acid Charger Development System

Control of On-Board

P-FET Switch-Mode Regulator

Please be aware that three important notices concerning operating limitations, standard warranty, and

liability limitations appear at the end of this data sheet.

Connection Descriptions

TB1

DC+ Charger supply (DC) 30V MAX

DC– Ground from charger supply and low

sideofsystemload

TB2

BAT+ Positive battery terminal

BAT– Negative battery terminal

TEM– Thermistor connection (negative)

TEM+ Thermistor connection (positive)

JP1 QSEL Charge algorithm select

JP2 DSEL Display mode select

JP3 TSEL Charge algorithm select

JP4 IGSEL Minimum current select

JP5 Number of cells

Fixed Configuration

The DV2031S2 board has the following fixed character-

istics:

VCC for the fast charge IC is regulated on-board

from the supply at connector TB1. TB1 can accept a

maximum of 30VDC. The minimum charging volt-

age for two cells is 10VDC, and the minimum

charging voltage for six cells is 22VDC.

LED1 and LED2 indicate charge status.

LED3 indicates a charge-pending or fault condition.

Charge begins on the later application of

1. The battery

2. Supply voltage

The onboard regulator supplies a fast charge cur-

rent IMAX of 2.5A. The fast (bulk) charge voltage

VBLK is set at 2.45V per cell (±1%) and the float

voltage VFLT is set at 2.25V per cell (±1%)

The number of cells can be changed within

board-defined parameters, as described below in

“Jumper-Selectable Configuration.”

The switching frequency of the PWM control is

100kHz.

The regulated current is controlled by the value of

the sense resistor RSNS according to the equation

CHG

SNS

=025.

The value of RSNS (R20 in the schematic) at ship-

ment is 0.10Ω. This resistor can be changed de-

pending on the application. The suggested maxi-

mum charging current IMAX for the bq2031S1

board is 2.5A with an accuracy of ±10%.

The thermistor provided is the Philips

2322–640–63103. With this thermistor connected

between TEM+ and TEM–, the temperature fault

limits are VLTF (low temperature fault) = 0°C, VHTF

(high temperature fault) = 45°C, and VTCO (charge

cutoff) = 47°C.

Jumper-Selectable

Configuration

The DV2031S2 must be configured as follows:

DSEL (JP2) selects the LED display options as de-

scribed in Table 1 on the following page.

TSEL (JP3) and QSEL (JP1) select the charge algo-

rithm as shown in Table 2 on the following page.

IGSEL (JP4) sets IMIN and the Two-Step Current

maintenance charge as a ratio of IMAX.I

COND =

IMAX/5, as shown below:

JP4 IMIN Fixed-Pulse

Average Current

LIMAX 10

COND MAX

210

HIMAX 20

COND MAX

420

None IMAX 30

COND MAX

830

As indicated in the Jumper Configuration Diagram,

JP5 configures the board for the number of

lead-acid cells.

DV2031S2

Rev. B Board

DV2031S2

Rev. B Board

JP1 JP3 Fast Charge Termination Maintenance

LHor LTwo-Step Voltage IMIN or MTO Constant voltage at

VFLT

H L Two-Step Current VBLK or ∆2VorMTO Fixed-pulse current at

ICOND

HH Pulsed Current VBLK (see Note) Fast-charge rate

when VBLK ≤VFLT

Note: Fast-charge termination by MTO is a fault.

Table 2. Charge Algorithms

Mode Charge Action State LED1LED2LED3

Battery absent or over-voltage fault Low Low High

Pre-charge qualification Flash Low Low

Fast charging High Low Low

Maintenance charging Low High Low

Charge pending (temperature out of range) X X Flash

Charging fault X X High

Battery absent or over-voltage fault Low Low High

Pre-charge qualification High High Low

Fast charge Low High Low

Maintenance charging High Low Low

Charge pending (temperature out of range) X X Flash

Charging fault X X High

None

Battery absent or over-voltage fault Low Low High

Pre-charge qualification Flash Flash Low

Fast charge: current regulation Low High Low

Fast charge: voltage regulation High High Low

Maintenance charging High Low Low

Charge pending (temperature out of range) X X Flash

Charging fault X X High

Notes: 1=V

CC;0=V

SS; X = LED state when fault occurred; Flash = 16s low, 16s high.

In the Pulsed Current algorithm, the bq2031 annunciates maintenance when charging current is off and

fast charge whenever charging current is on.

Table 1. bq2031 LED Display Output Summary

Setup Procedure

1. Configure DSEL, TSEL, QSEL, maximum time-out,

and the number of cells.

2. Connect the thermistor to TEM+ and TEM–.

3. Attach the battery pack to BAT+ and BAT–.

4. Connect the charging supply to TB1 (DC+, DC-).

The combined charging and system load should not ex-

ceed the IMAX limit of 2.5A.

DV2031S2

Rev. B Board

JC2031.eps

BAT+

DC-

DC+

TB2

TB1

JP4

2346

H JP1

QSEL DSEL TSEL

JP2

JP3

BAT-

TEM-

TEM+

Cells #

IGSEL

JP5

Jumper Configuration Diagram

TB1

+5V

GND

OUT

VDC D6A

D6B

78L05

1N4148 D2

1N4744

ZTX790A Q1

MTP23P06V

2N3904

D7B

1N5821 D7A

SBL845DI

1000µF

35V

10µF

35V

10µF

0.1µF

bq2031

2031s2-b.eps

LED2/DSEL

LED1/TSEL

LED3/QSEL

MOD

COM

TPWM

TMTO

LED2

LED1

LED3

123123123

FLOAT

BAT

VCOMP

ICOMP

IGSEL

SNS

0.1µF

200µH

R21

20K

C15

0.1µF

C14

470µF

35v

C11

0.01µF

0.1µF

C10

0.1µF

C13

0.1µF

R10

10K

JP3

TSEL JP2

DSEL JP1

QSEL

R11

10K

2N3904

10K

1K R13

0_OHMS

LED3

LED2

LED1

See application note for additional details.

Not used

C12

1000pF

62K

R22

43_OHMS

ZTX790A

R19

464K

R12

49.9K

+5V

R18

1K R2

6.81K

3.74K

JP4

IGSEL

220

10µF

10K

R16

52.3K

R15

102K

R17

154K

R14

261K

R20

0.10

TEM

BAT

TB2

BAT+

BAT-

TEM-

TEM+

2 Cell

JP5

468

1357

3 Cell 4 Cell 6 Cell

10K

100K

1000pF

VDC+

1N5821

SBL845DI

DV2031S2 Board Schematic

DV2031S2

Rev. B Board

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 30 V and the output

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