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SS6782G 数据表(PDF) 14 Page - Silicon Standard Corp.

部件名 SS6782G
功能描述  Charge Controller for Dual Batteries
PDF  19 Pages
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制造商  SSC [Silicon Standard Corp.]
网页  http://www.siliconstandard.com
标志 SSC - Silicon Standard Corp.

SS6782G 数据表(HTML) 14 Page - Silicon Standard Corp.

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SS6782G
9/21/2005 Rev.3.01
Setting the ADJ Pin Voltage
∆∆
T/ t=
1
60
0.0166
=
The slope of ∆
detection is determined by
the
ADJ pin voltage of the SS6782G.
∆
T/ t
(d) VADJ =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 VADJ under different
setting conditions should be set as tabu-
lated below.
The calculation of ADJ pin voltage is shown in
the following procedure followed by an example.
Procedure
TABLE 5 ADJ Pin Voltage (TL=0°C, TH=50°C)
∆
∆
T / t
S.T.
0.75
(
°C/min.)
1.0
(
°C/min.)
1.25
(
°C/min.)
40 min. (2C)
0.37
0.5
0.63
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) First, determine the temperature protection
limits TH and TL. Then, substitute TH & TL
into the following equation:
∆
∆
V
T
0.72V
0.29V
TH TL
0.43V
TH TL
TS
BASE
CC
CC
CC
=
−
−
=
−
(b) Determine the safety timer to obtain the
value of
∆tBASE .
.)
(min
Timer
Safety
.)
(min
80
56(sec.)
=
(sec.)
tBASE
×
∆
A similar table for temperature range from 0
°C
to 60
°C is shown below.
(c) Determine the expected slope of ∆
∆
T / t at
which temperature rises y
°C in x seconds
and fast charge is subsequently cut off.
TABLE 6 ADJ Pin Voltage (TL=0°C, TH=60°C)
∆
∆
T
t
y
x
=
∆
∆
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
(d) Calculate the value of VADJ
V25
V
T
T
t
t
ADJ
TS
BASE
BASE
=×
×
×
∆
∆
∆
∆
∆
Example
(a) Let TH=50
°C, TL=0°C, VCC =5V. We have
C
0.043V/
0
50
5
0.43
T
V
BASE
TS
°
=
−
×
=
∆
∆
Setting the Period of Safety Timer
The SS6782G provides a method for linearly ad-
justing the period of safety timer with an exter-
nal resistor connected from TMR pin to GND.
The relation between safety timer length and
the external resistor (RTMR) is shown in Fig. 16.
The table following shows the resistor values.
which means that VTS decreases 43mV
as temperature rises 1
°C.
(b) If safety timer is equal to 80 minutes,
∆tBASE is then 56 seconds.
(c) If fast charging should be terminated when
temperature rises 1
°C in 60 seconds, then



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