AIC1783 데이터 시트보기 (PDF) - Analog Intergrations

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AIC1783

Battery Charge Controller

Analog Intergrations 

AIC1783

The functions and charging states control mentioned

above are illustrated in the function flow chart of

AIC1783 (Fig. 2)

DESIGN GUIDE

Battery Voltage Measurement

The AIC1783 measures the battery voltage through

VBT pin, which is connected to battery positive

terminal through a resistor-divider net work, as

shown in Fig. 1

VBAT

RA

R5

7

VBT

+ 100K

RB

C5

C6

AIC1783

FIG. 1

Battery Voltage Divider

The suggested divider resistance of RA and RB

for the corresponding number of battery cells are

as below:

BATTERY

CELLS

2~4

3~6

4~8

5~10

6~12

8~16

RA/RB

2

3.3

4.9

6.4

7.8

10.8

RA (KΩ)

240

300

300

300

310

390

RB (KΩ)

120

91

62

47

39

36

Setting the Period of Safety Timer

The AIC1783 provides a method for linearly

adjusting the period of safety timer with an external

resistor connected from TIMER pin to GND. The

relation between safety timer length and the

external resistor (RTIMER) is shown in Fig. 3. The

table following shows the resistor values for some of

the commonly chosen safety timer periods. Also

shown in the table are their corresponding oscillator

frequencies.

800

600

400

200

0

0

100

200

300

400

500

Safety Timer (min.)

Fig. 3 Safety Timer vs. RTIMER

8

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