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參數(shù)資料
| 型號： | AIC1781CN |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Battery Charge Controller |
| 中文描述： | 電池充電控制器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 423K |
| 代理商： | AIC1781CN |
AIC1781
13
Procedure
(a) First, determine the temperature protection limits
TH and TL. Then, substitute TH & TL into the
following equation:
V
T
0.72V
0.29V
TL
TH
0.43V
TH
TL
TS
BASE
CC
CC
CC
=
=
(b) Determine the safety timer to obtain the value of
t
BASE
.
t
(sec.) =56(sec.)
Safety Timer
BASE
80
(min.)
(min.)
×
(c) Determine the expected slope of
T /
t at
which temperature rises y
°
C in x seconds and
fast charge is subsequently cut off.
T
t
y
x
=
(d) Calculate the value of V
ADJ
V
25
V
T
T
t
t
ADJ
TS
BASE
BASE
=
×
×
×
Example
(a) Let TH=50
°
C, TL=0
°
C, V
CC
=5V. We have
T
V
BASE
=
0.43
50
5
0
0.043V/ C
TS
×
=
which means that V
TS
decreases 43mV as
temperature rises 1
°
C.
(b) If safety timer is equal to 80 minutes,
t
BASE
is
then 56 seconds.
(c) If fast charge should be terminated when
temperature rises 1
°
C in 60 seconds, then
0.0166
60
1
=
t
T/
=
(d) V
ADJ
=25 x 0.043x 0.0166 x 56 = 1(V)
If the temperature range is from 0
°
C to 50
°
C,
the voltage of V
ADJ
under different setting
conditions should be set as tabulated below.
TABLE. 3 ADJ pin Voltage (TL=0
°
C, TH=50
°
C)
S.T.
40 min. (2C)
80 min. (1C)
120 min. (0.67C) 1.12
160 min. (0.5C)
200 min. (0.4C)
240 min. (0.33C)
T /
t
0.75
(
°
C/min.)
0.37
0.75
1.0
(
°
C/min.)
0.5
1.0
1.5
2.0
2.5
3.0
1.25
(
°
C/min.)
0.63
1.25
1.87
2.5
3.12
3.75
1.5
1.87
2.25
A similar table for temperature range from 0
°
C to
60
°
C is as below.
TABLE. 4 ADJ Pin Voltage (TL=0
°
C, TH=60
°
C)
T /
t
S.T.
40 min. (2C)
80 min. (1C)
120 min. (0.67C)
160 min. (0.5C)
200 min. (0.4C)
240 min. (0.33C)
0.75
(
°
C/min.)
0.31
0.62
0.94
1.25
1.56
1.87
1.0
(
°
C/min.)
0.42
0.84
1.25
1.67
2.08
2.5
1.25
(
°
C/min.)
0.52
1.05
1.56
2.08
2.60
3.12
VBT Range and Temperature Protection
The acceptable voltage range of VBT pin and
mode of temperature protection function is
determined by the voltage of SEL3 pin, shown as
the following:
(a)
SEL3 > V
CC
- 0.3V
Acceptable VBT Range:
Before initial timer: 0.16V~2.7V
After initial timer: 0.69V~2.7V
Temperature Protection Mode:
Entering charge-suspending mode when
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