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SS6781ACSTR 데이터시트(PDF) 13 Page - Silicon Standard Corp.

부품명 SS6781ACSTR
상세설명  Battery Charger Controller
PDF  18 Pages
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6781ACSTR 데이터시트(HTML) 13 Page - Silicon Standard Corp.

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SS6781A(G)
1/11/2005 Rev.2.10
The calculation for Rx and Ry in the circuit is as
following.
0.29 VCC =
)
R
(Ry//
Rx
Ry//R
TH
TH
+
x VCC
RTH=The resistance of thermistor at upper limit of
temperature protection.
0.72 VCC =
)
R
(Ry//
Rx
Ry//R
TL
TL
+
x VCC
RTL= The resistance of thermistor at lower limit of
temperature protection.
Substitution and rearranging the equations yield
Rx= 2.061
×
×
−
R
R
R
R
TL
TH
TL
TH
Ry =
5. 3
R
R
R
6. 3R
TL
TH
TL
TH
×
×
−
If temperature characteristic of the thermistor is like
that of SEMITEC 103AT-2, the resistance of Rx and
Ry is tabulated for different TL and TH as below.
(Note: TL is lower temperature limit and TH is upper
temperature limit.)
TABLE 4 Values of Rx and Ry at TL = 0
°C
TH (
°C)
Rx(k
Ω)
Ry (k
Ω)
50
10.1
551.1
51
9.7
300.7
52
9.4
204.8
53
9.0
153.9
54
8.7
122.8
55
8.4
101.8
56
8.1
86.5
57
7.8
75.0
58
7.5
66.0
59
7.2
58.7
60
7.0
52.8
61
6.8
47.8
62
6.5
43.6
63
6.3
39.9
64
6.1
36.8
65
5.9
34.0
66
5.7
31.6
67
5.5
29.5
68
5.3
27.5
69
5.2
25.8
70
5.0
24.3
TABLE 5 Values of Rx and Ry at TL = -10
°C
TH (
°C)
Rx (k
Ω)
Ry (k
Ω)
45
11.4
95.6
46
11.0
85.0
47
10.6
76.2
48
10.2
68.9
49
9.8
62.8
50
9.5
57.5
51
9.1
52.9
52
8.8
48.8
53
8.5
45.3
54
8.2
42.1
55
7.9
39.4
56
7.6
36.8
57
7.4
34.6
58
7.1
32.5
59
6.9
30.7
60
6.7
29.0
61
6.4
27.4
62
6.2
26.0
63
6.0
24.6
64
5.8
23.4
65
5.6
22.2
Setting the ADJ Pin Voltage
The slope of
∆T/∆t detection is determined by the
ADJ pin voltage of the SS6781A.
The calculation of ADJ pin voltage is shown in the
following procedure, followed by an example.



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