Texas Instruments BQ2003 Evaluation Module for NiCd/NiMH, linear DV2003L1 DV2003L1 데이터 시트

External Current Source Control (P1): Enables/dis-
ables on-board linear regulator.

Temperature Disable: Connecting a 10K

Ω resistor be-

tween THERM and GND or BAT– disables temperature
control.

1.

Configure DVEN, TM1, TM2, and number-of-cells
(NOC) jumpers.

2.

Connect the provided thermistor or a 10K

Ω resistor

across THERM to GND.

Note: RT1 and RT2 match the thermistor provided
and must be changed if a different thermistor type

is used (see Appendix A in the application note,
“Using the bq2003 to Control Fast Charge”).

3a. If using off-board regulation, close jumper P1 and

attach the MOD connector to the external current
control.

3b. If using on-board regulation, open jumper P1.

4.

If using the discharge-before-charge option, connect
a current-limiting discharge load from BAT+ to
DSCHG.

5.

If using the INHIBIT function, connect a switch
across J2 (IN to +V) or connect INH to the control-
ling signal source (3–5V).

6.

Attach the battery pack to BAT+ and BAT–. For
temperature control, the thermistor must contact
the cells.

7.

Attach DC current source to DC+ (+) and GND (–)
connections in J1.

3

I

XTRKL

External additional trickle current

-

-

1

A

P

D

LM317 power dissipation

-

-

6

W

P

D

= I

DC+

* (V

DC+

– V

BAT+

– 2V)

I

DC+

LM317 input current

-

1.25

-

A

Configured rate.

Maximum LM317 input current
(with R13 = 0.83

Ω, minimum value)

-

1.5

-

A

R13 changed for
maximum rate.

V

DC+

LM317 regulation enabled

4.25 + V

BAT+

or 10

-

9.5 + V

BAT+

or 35

V

Notes 1, 2

External current source

10

-

9.5 + V

BAT+

or 35

V

V

BAT+

BAT+ input voltage

-

-

30

V

V

THERM

THERM input voltage

0

-

5

V

V

MOD

MOD output voltage

0

-

5

V

In series with R25

V

IN

Inhibit input signal

0

-

5

V

I

DSCHG

Discharge load current

-

-

2

A

1.

The voltage drop across the LM317, diodes, and resistors in charge path—with the LM317 enabled—
is approximately 4.25V. Maximum voltage drop across LM317 is primarily limited by the on-board
heat sink and should be controlled to limit heat dissipation to 6W in free air. Additional cooling is
necessary if the heat dissipation exceeds 6W.

2.

The input voltage must be greater than NOC * 1.8V + V

LOSS

for detection of battery absent and for

charge initiation on battery replacement.

[ 1 2 ]

Disabled

1 2

Enabled