AIC1761/1766

BATTERY CHARGE CONTROLLER

SPEC NO: DS-1761-02

ANALOG INTEGRATIONS CORPORATION

www.analog.com.tw

4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.

TEL: (8863)577-2500 FAX:(8863)577-2510

11

3.

If the battery charge current is high, say, over

1.5A, quality of circuit board layout and wiring

connection points become increasingly im-

portant in the charger circuit reliability.

4.

Critical components need to meet adequate

rating to prevent heating-up of these compo-

nents from causing circuit malfunction.

5.

Since the AIC1761/1766 is fabricated with

CMOS process, cares must be taken in han-

dling this device to avoid possible damage

from electro-static discharge.

EXPERIMENTAL RESULTS

Experiments have been conducted to verify the

AIC1761/1766 operation with NiCd and NiMH

battery cells of various brands. Actual results

shown in the following figures clearly indicate that

the negative delta voltage detector and the peak

voltage timer of the AIC1761/1766 have precisely

detected the tiny cell voltage drops or the cell volt-

age peaks and subsequently terminated the fast

charge process after batteries are fully charged.

The battery cell temperatures were all under

safety levels. Note that the fast charge for the

NiMH battery in Fig. 5 is terminated by the peak

voltage timer (0V

∆ ) while the fast charge for the

NiCd

battery in Fig. 6 is terminated by the -

∆V

detector.

Charge Time (min.)

0

20

40

60

80

1.2

1.3

1.4

1.5

1.6

Temperature

Voltage

Charge Current = 1A

Cell Capacity = 1000mAH

20

30

40

50

60

AIC1766

AIC1766

Fig. 5

Charge Characteristics of NiMH Battery

Both Fig. 5 and Fig. 6 were obtained by using the

AIC1766. Results of similar experiments by using the

AIC1761 are shown in Fig. 7 and Fig.8.

Charge Time (min.)

20

30

40

50

60

0

20

40

60

80

1.3

1.4

1.5

1.6

1.7

Temperature

Voltage

Charge Current=0.7A

Cell Capacity=700mAH

AIC1766

Fig. 6

Charge Characteristics of NiCd Battery

Charge Time (min.)

010

20

30

40

50

60

70

1.2

1.3

1.4

1.5

1.6

20

30

40

50

60

Temperature

Voltage

AIC1761

Charge Current = 1A

Cell Capacity =1000mAH

Fig. 7

Charge Characteristics of NiMH Battery

020

40

60

80

1.3

1.4

1.5

1.6

1.7

Charge Time (min.)

20

30

40

50

60

Voltage

Temperature

Charge Current=0.7A

Cell Capacity=700mAH

AIC1761

Fig. 8

Charge Characteristics of NiCd Battery