AIC1782CN Ver la hoja de datos (PDF) - Analog Intergrations
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AIC1782CN Datasheet PDF : 17 Pages
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The calculation for Rx and Ry in the circuit is as
following.
0.29
Vcc
=
Rx
Ry / /RTH
+ (Ry / / RTH)
×
Vcc
RTH= The resistance of thermistor at upper limit
of temperature protection.
0.72
Vcc
=
Rx
Ry / /RTH
+ (Ry / / RTL)
×
Vcc
RTL= The resistance of thermistor at lower limit
of temperature protection.
Substitution and rearranging the equations yield
Rx= 2.061 × RTL × RTH
RTL − RTH
Ry = 5. 3 × RTL × RTH
RTL − 6. 3RTH
If temperature characteristic of the thermistor
is like that of SEMITEC 103AT-2, the resis-
tance 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. 1 Values of Rx and Ry at TL = 0°C
TH (°C)
50
51
52
53
54
55
56
57
58
59
60
61
Rx(KΩ)
10.1
9.7
9.4
9.0
8.7
8.4
8.1
7.8
7.5
7.2
7.0
6.8
Ry (KΩ)
551.1
300.7
204.8
153.9
122.8
101.8
86.5
75.0
66.0
58.7
52.8
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
AIC1782
67
5.5
29.5
68
5.3
27.5
69
5.2
25.8
70
5.0
24.3
TABLE. 2 Values of Rx and Ry at TL = -10°C
TH (°C)
Rx (KΩ)
Ry (KΩ)
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
ADJ pin voltage of the AIC1782.
The calculation of ADJ pin voltage is shown in
the following procedure followed by an example.
Procedure
(a) First, determine the temperature protection
limits TH and TL. Then, substitute TH & TL
into the following equation:
17
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