DV2954S1L [ETC]

Li-Ion Charger Development System;


型号：	DV2954S1L
厂家：	ETC
描述：	Li-Ion Charger Development System
文件：	总5页 (文件大小：858K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DV2954S1L

Li-Ion Charger Development System

Control of On-Board PNP Switch-Mode Regulator

with Low-Side Current Sensing

Features

➤ bq2954 fast-charge control evaluation and

development, based on switching buck converter with

low-side battery-current sensing

➤ On-board configuration for fast charge of 1, 2, 3, or 4

Li-Ion cells

➤ Charge termination by maximum voltage, selectable

minimum current, or maximum time-out

➤ Constant current (up to 1.25A) and constant voltage

(up to 16.8V) provided by on-board switch-mode

regulator

➤ Jumper-configurable bicolor-LED display

➤ Direct connections for battery and thermistor

➤ Maximum charge time of 5 hours

General Description

The DV2954S1L Development System provides a devel-

opment environment for the bq2954 Lithium Ion Fast-

Charge IC. The DV2954S1L incorporates a bq2954 and a

buck-type switch-mode regulator to provide fast charge

control for 1 through 4 Li-Ion cells.

Fast charge is preceded by a pre-charge qualification pe-

riod.

Connection Descriptions

Fast charge termination occurs on:

ꢀ

Minimum current – I_MAXdivided by 10, 15, or 20

Maximum time-out

DC+

DC-

Charger supply positive (24VDC max.)

Charger supply ground

ꢀ

The bq2954 can be reset and a new charge cycle started

by applicaton of power to the board or battery replace-

ment. The board automatically initiates a recharge

when the battery voltage drops to 3.85V per cell.

BAT+

TEM+

BAT-

Positive battery terminal

Postive thermistor connections

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.

Negative battery terminal and

thermistor connecton.

JP1

JP2

JP3

Display mode selection

Number of cells selection

Before using the DV2954S1L board, please review the

bq2954 data sheet.

Full and minimum current termination

select

10/98

Rev. C Board

DV2954S1L

JP2: Configures the board for the number of cells.

Fixed Configuration

The DV2954S1L board has the following characteristics:

JP2

Number of Cells

[1 2 ] 3 4 5 6 7 8

1 2 [3 4] 5 6 7 8

1 2 3 4 [5 6] 7 8

1 2 3 4 5 6 [7 8]

ꢀ

V_CCfor the fast-charge IC is regulated onboard

from the supply at connector J1.

ꢀ

J1 can accept a maximum of 24VDC.

LED indicates charge status.

Charge begins on the later application of

JP3: Sets the full and minimum current termination.

–

The battery

JP3

I_FULL

I_MIN

Supply voltage

I _MAX

[1 2] 3

1 [2 3]

1 2 3

The on-board regulator supplies a fast charge current

I_MAXof 1.25A. The fast-charge voltage V_MAXis set at

25°C.

I _MAX

The switching frequency of the PWM control loops is

120kHz.

Setup Procedure

1. Connect the thermistor to TEM+ and BAT-.

2. Attach the battery pack to BAT+ and BAT-.

3. Connect the charging supply to J1.

The regulated current is controlled by the value of the

sense resistor R_SNSaccording to the relationship

0.250V

R_SNS

I_CHG

The value of R_SNS(R18 in the schematic) at shipment is

0.200Ω. This resistor can be changed depending on the

application. The maximum charging current I_MAXfor the

DV2954S1L board is 1.25A.

The following table shows the minimum input require-

ment for a given number of cells.

Minimum Charger

Supply Input

Number of Cells

The thermistor provided is a Philips 2322–640–63103.

With this thermistor connected between TEM+ and

BAT-, the temperature fault limits are V_LTF(low-tem-

perature fault) = 0°C, V_HTF(high-temperature fault) =

45°C, and V_TCO(charge cutoff) = 47°C.

7.5VDC

12VDC

18VDC

23VDC

The combined charging and system load should not ex-

ceed the I_MAXlimit of 1.25A.

Jumper-Selectable Configuration

The DV2954S1L can be configured as follows (see Jum-

ber Configuration Diagram for location of the jumbers):

JP1: Configures the display mode (DSEL).

JP1

Display Mode

Mode 1

Mode 2

Mode 3

[1 2 ] 3

1 [2 3]

1 2 3

Rev. C Board

DV2954S1L

Jumper Configuration Diagram

BAT+

DC+

DC-

TEM+

BAT-

JP2

BAT-

JP3

JP1

2 1

BD2954JCDL.eps

DV2954S1L Board Schematic

2N3906

4.7K

ZTX789A

1N5818

10K

140UH

R9 ^2N3904

R19

52.3K

R13

R15

357K

R14

255K

ZTX789A

100µF

35V

154K

10K

1N5818

R20

+5V

510

78L05ACZ

OUT

GND

C10

47µF

35V

JP2

10µH

1N4148

1µF

35V

1µF

35V

0.1µF

+5V

R16

49.9K

ZTX451

4.32K

R10

100

BAT+

TEM+

BAT-

2N3904

+5V

8.45K

R21

+5V

R17

100K

C12

R18

0.2

R12

1000PF

0.1µF

1/2W

RED

+5V

10K

+5V

LED₂/DSEL

LED₁/CSEL

MOD

CHG

BAT

VCOMP

ICOMP

I_TERM

SNS

+5V

JP1

JP3

10K

GREEN

V_CC

V_SS

DSEL

LCOM

BTST

TPWM

R11

2N3904

10K

ITERM

bq2954

C11

4700PF

820PF

100V

0.1µF

2954S1LC.EPS

10/27/98

Rev. C Board

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO

BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

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Authorized Distributor

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DV2954S1L

DV2954S1L [ETC]

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