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參數(shù)資料
| 型號(hào)： | AIC1782CS |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Octal buffers and line drivers 20-SOIC 0 to 70 |
| 中文描述： | 雙電池充電控制器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 361K |
| 代理商： | AIC1782CS |
AIC1782
18
T
V
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
.
(sec.) =56(sec.)
BASE
80
(min.)
t
Safety Timer
(min.)
×
(c)
Determine the expected slope of
which temperature rises y
°
C in x seconds
and fast charge is subsequently cut off.
t
x
T /
t at
T
y
=
(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
V
0.43
5
TS
=
which means that V
TS
decreases 43mV
as temperature rises 1
°
C.
T
50
0
0.043 V/ C
BASE
×
=
(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
T /
t =
1
60
0.0166
=
(d)
V
ADJ
=25 x 0.043 x 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 tabulat-
ed below.
TABLE. 3 ADJ Pin Voltage (TL=0
°
C, TH=50
°
C)
T /
t
S.T.
(
°
C/min.)
0.37
0.75
1.0
(
°
C/min.)
0.5
1.25
(
°
C/min.)
0.63
40 min. (2C)
80 min. (1C)
0.75
1.0
1.25
120 min. (0.67C)
1.12
1.5
1.87
160 min. (0.5C)
1.5
2.0
2.5
200 min. (0.4C)
1.87
2.5
3.12
240 min. (0.33C)
2.25
3.0
3.75
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.
0.75
(
°
C/min.)
1.0
(
°
C/min.)
1.25
(
°
C/min.)
40 min. (2C)
0.31
0.42
0.52
80 min. (1C)
0.62
0.84
1.05
120 min. (0.67C)
0.94
1.25
1.56
160 min. (0.5C)
1.25
1.67
2.08
200 min. (0.4C)
1.56
2.08
2.60
240 min. (0.33C)
1.87
2.5
3.12
Setting the Period of Safety Timer
The AIC1782 provides a method for linearly
adjusting the period of safety timer with an ex-
ternal resistor connected from TMR pin to GND.
The relation between safety timer length and
the external resistor (R
TMR
) is shown in Fig. 4.
The table following shows the resistor values for
some of the commonly chosen safety timer pe-
riods. Also shown in the table is their corre-
sponding oscillator frequencies.
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