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參數(shù)資料
| 型號(hào)： | TK11050 |
| 廠商： | TOKO Inc. |
| 英文描述： | TEMPERATURE CONTROLLER IC |
| 中文描述： | 溫度控制器IC |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 56K |
| 代理商： | TK11050 |
Page 6
January 1999 TOKO, Inc.
TK11050
The hysteresis voltage (V
SH
) of the comparator can be
DRRDRDROP
(
(5)
where I
SH
= 1.25
μ
A
The hysteresis represented as temperature is:
(6)
Solving for temperature coefficient (T
C
):
(7)
Solving for R
1
from Equations 3 and 7:
(8)
R
2
can now be calculated by substituting R
1
into Equation 4:
Example:
R
1
and R
2
when set temperature is 80
°
C (T
SET
= 353
°
K)
and temperature hysteresis (T
SH
) is 5
°
C.
APPLICATION HINTS
EXTERNAL RESISTORS R
1
AND R
2
The temperature set point (T
SET
) and hysteresis (T
SH
the TK11050 are easily set by two external resistors R
1
and
R
2
. See Figure 1 for clarification of T
SET
and T
SH
.
The set voltage (V
SET
) of the comparator at the set
temperature (T
SET
) is calculated as follows:
(1)
where T
SET
is an absolute temperature (
°
K).
That is, T
SET
(
°
K) =
°
C + 273
and T
C
= 4 mV/
°
C.
1. For Set Temperatures
≥
25
°
C
(2)
where V
ref
= 1.6 V
I
IB
= 0.1
μ
A
The temperature coefficient (T
C
) is calculated by Equations
1 and 2, resulting in:
(3)
From Equation 3, R
2
is calculated as follows:
(4)
(V
ref
- R
1
x I
IB
)
V
SET
=
=
x
R
1
+ R
2
R
2
x V
ref
R
1
+ R
2
R
1
x R
2
x I
IB
R
1
+ R
2
R
2
T
SET
T
C
=
x
R
1
+ R
2
R
2
V
ref
- R
1
x I
IB
R
1
x R
2
R
1
+ R
2
V
SH
=
X
)
(I
SH
- I
IB
)
R
1
+ R
2
R
1
x R
2
T
SH
=
(I
SH
- I
IB
)
T
C
x
(
)
R
1
+ R
2
R
1
x R
2
T
C
=
(I
SH
- I
IB
)
T
SH
x
(
)
R
1
=
T
SET
x I
SH
- ( T
SET
- T
SH
)
x I
IB
V
ref
x T
SH
R
2
=
V
ref
- R
1
x I
IB
- T
SET
x T
C
T
SET
x T
C
x R
1
V
SET
= T
SET
x T
C
TSET
TSH
FIGURE 1
R
1
= 19.68 k = 20 k
R
1
=
353 x1.25
μ
- ( 353
- 5)
x 0.1
μ
1.6
x 5
R
2
=
1.6 -19.68 k x 0.1
μ
- 353 x 4 m
353
x 4 m x 19.68 k
R
2
= 149.39 k = 150 k
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