January 1999 TOKO, Inc.
Page 1
TK11051
VCONT
VCC
COMP IN
COMP OUT
VREF
GND
FEATURES
s
Internal Temperature Sensor, Voltage Reference
and Comparator
s
Temperature Threshold and Hysteresis Set by Only
Two External Resistors
s
Output Logic: High to Low with Increasing Temp.
s
Active High On/Off Control
s
2.7 to 6.0 V Supply Range
s
Miniature Package (SOT-23L-6)
s
Minimum External Parts Count
s
Low Power Consumption
s
Very Wide Temperature Range
BLOCK DIAGRAM
TK11051
DESCRIPTION
The TK11051 is an accurate temperature controller IC for
use over the -30 to +105
C temperature range. The
TK11051 monolithic bipolar integrated circuit contains a
temperature sensor, stable voltage reference and a
comparator, making the device very useful as an on/off
temperature controller. Two external resistors easily set
the sensing temperature threshold and hysteresis. Its wide
operating voltage range of 2.7 to 6.0 V makes this IC
suitable for a number of applications requiring accurate
temperature control. The device is in the "on" state when
the control pin is pulled to a logic high level.
The TK11051 is available in a miniature SOT-23L-6 surface
mount package.
01S
VREF
GND
VCONT
COMP OUT
VCC
ON/OFF
CIRCUIT
VOLTAGE
REFERENCE
+
-
TEMPERATURE
SENSOR
COMP IN
VPTAT
ORDERING INFORMATION
TAPE/REEL CODE
TL: Tape Left
Tape/Reel Code
TK11051MTL
APPLICATIONS
s
Home and Industrial Thermostats
s
Home Appliance Temperature Control
s
Notebook Computer Temperature Monitor
s
Pentium Processor Temperature Monitor
s
Power Supply Overtemperature Protection
s
Copy Machine Overtemperature Protection
s
System Overtemperature Protection
TEMPERATURE CONTROLLER IC
Page 2
January 1999 TOKO, Inc.
TK11051
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................... 12 V
Power Dissipation (Note 1) ................................ 200 mW
Storage Temperature Range ................... -55 to +150
C
Operating Temperature Range ................. -30 to +105
C
Operating Voltage Range ................................. 2.7 to 6 V
Junction Temperature .......................................... 150
C
Lead Soldering Temperature (10 s) ..................... 235
C
TK11050 ELECTRICAL CHARACTERISTICS
Test conditions: T
A
= 25
C, V
CC
= 3.0 V, V
CONT
= 2.4 V, I
OUT
= 40
A, R
3
= 100 k
,
unless otherwise specified.
Note 1: Power dissipation is 200 mW when in Free Air. Derate at 1.6 mW/
C for operation above 25
C.
Note 2: The resistance values of R
1
and R
2
can be calculated as follows: R
1
= V
ref
x T
SH
/ (T
SET
x I
SH
- (T
SET
-T
SH
) x I
IB
), R
2
= T
SET
x T
C
x R
1
/ (V
ref
-
R
1
x I
IB
- T
SET
x
T
C
).
I
IB
is 0.1
A and I
SH
is 1.25
A.
Note 3: When V
PTAT
< COMP IN, COMP OUT > 2.8 V (High Level). When V
PTAT
> COMP IN, COMP OUT < 0.3 V (Low Level).
Note 4: V
PTAT
does not have an output pin.
L
O
B
M
Y
S
R
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T
E
M
A
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5
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T
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5
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=
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V
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A
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0
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=
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T
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0
=
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4
-
0
0
.
4
C
C
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f
e
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S
C
I
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A
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g
a
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l
o
V
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c
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R
T
A
C
5
2
=
6
.
1
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r
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C
t
u
p
t
u
O
e
c
n
e
r
e
f
e
R
R
1
R
+
2
k
0
4
=
0
4
0
0
5
A
g
e
R
e
n
i
L
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o
i
t
a
l
u
g
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C
V
6
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3
=
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8
V
m
g
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R
d
a
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L
n
o
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t
a
l
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g
e
R
d
a
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A
0
0
5
o
t
0
=
1
8
V
m
S
N
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T
A
C
I
F
I
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P
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1
5
.
3
6
A
V
)
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(
T
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)
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e
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a
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8
.
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C
C
V
V
)
F
F
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(
T
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)
F
F
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(
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6
.
0
V
January 1999 TOKO, Inc.
Page 3
TK11051
ON/OFF
CIRCUIT
VOLTAGE
REFERENCE
+
-
TEMPERATURE
SENSOR
VPTAT
ICONT
VCONT
R1
R2
IIB
ISH
R1 + R2 = 40 k
VCC
ICC
R3
100 k
10 F
ISINK
COMP
OUT
COMP IN
Vref
GND
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25
C, V
CC
= 3 V, V
CONT
= 2.4 V, I
OUT
= 40
A, unless otherwise specified.
TEST CIRCUIT
V
ref
(V)
1.60
1.62
LINE REGULATION
VCC (V)
1.58
2 4 6 8 10
1.61
1.59
V
PTAT
(V)
1.2
1.6
REFERENCE VOLTAGE vs.
TEMPERATURE
TA (
C)
0.8
-40 0 40 80 120
1.4
1.0
I CONT
A)
2
4
CONTROL CURRENT vs.
CONTROL VOLTAGE
VCONT (V)
0
0 0.6 1.2 1.8 2.4
3
1
I CONT
A)
2
4
CONTROL CURRENT vs.
TEMPERATURE
TA (
C)
0
-40 0 40 80 120
3
1
V
ref
(V)
1.60
1.62
LOAD REGULATION
Iref (mA)
1.58
0 0.2 0.4 0.6 0.8
1.61
1.59
V
ref
(V)
1.60
1.62
REFERENCE VOLTAGE vs.
TEMPERATURE
TA (
C)
1.58
-40 0 40 80 120
1.61
1.59
Page 4
January 1999 TOKO, Inc.
TK11051
V
ref
(V)
1.0
2.0
CONTROL VOLTAGE RESPONSE A
TIME (ms)
0
0 2 4 6 8
1.5
0.5
VCONT = 0 TO 2.4 V
COUT = 0.1 F
V
ref
(V)
1.0
2.0
CONTROL VOLTAGE RESPONSE B
TIME (ms)
0
0 2 4 6 8
1.5
0.5
VCONT = 0 TO 2.4 V
COUT = 0 F
RR
(dB)
40
80
RIPPLE REJECTION RATIO A (Vref)
f (Hz)
0
10 100 1 k 10 k 100 k
60
20
VRR = 100 mVrms
COUT = 0.1 F
RR
(dB)
40
80
RIPPLE REJECTION RATIO B (Vref)
f (Hz)
0
10 100 1 k 10 k 100 k
60
20
VRR = 100 mVrms
COUT = 0 F
I B
(
n
A)
80
120
INPUT BIAS CURRENT vs.
TEMPERATURE
TA (
C)
40
-40 0 40 80 120
100
60
COMP IN > VPTAT
I SH
(
A)
1.2
1.4
HYSTERESIS SET CURRENT vs.
TEMPERATURE
TA (
C)
1.0
-40 0 40 80 120
1.3
1.1
COMP IN < VPTAT
I CC
(
A)
220
260
SUPPLY CURRENT vs.
TEMPERATURE
TA (
C)
180
-40 0 40 80 120
240
200
COMP OUT = LOW LEVEL
R1 + R2 = 40 k
R3 = 100 k
COMP OUT = HIGH LEVEL
I CC
(
A)
250
350
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
VCC (V)
150
2 3 4 5 6
300
200
COMP OUT = HIGH LEVEL
R1 + R2 = 40 k
R3 = 100 k
COMP OUT = LOW LEVEL
V
ref
(V)
0.8
1.6
REFERENCE VOLTAGE vs.
CONTROL VOLTAGE
VCONT (V)
0
0 0.6 1.2 1.8 2.4
1.2
0.4
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
T
A
= 25
C, V
CC
= 3 V, V
CONT
= 2.4 V, I
OUT
= 40
A, unless otherwise specified.
January 1999 TOKO, Inc.
Page 5
TK11051
I CC
(
A)
160
320
SUPPLY CURRENT vs.
CONTROL VOLTAGE
VCONT (V)
0
0 0.6 1.2 1.8 2.4
240
80
C
LL
(
m
V)
80
160
COMPARATOR OUTPUT (LOW LEVEL)
vs. OUTPUT SINK CURRENT
IOUT (mA)
0
0 0.2 0.4 0.6 0.8
120
40
COMP
OUT
(V)
2
4
COMPARATOR OUTPUT vs.
TEMPERATURE
TA (
C)
0
65 70 75 80 85
3
1
TSET = 80
C
TSH = 5
C
COMP OUT (V)
2
4
CONTROL VOLTAGE RESPONSE
TIME (ms)
0
0 2 4 6 8
3
1
VCONT = 0 TO 2.4 V
COMP OUT (V)
2
4
COMPARATOR INPUT RESPONSE
TIME (ms)
0
0 0.2 0.4 0.6 0.8
3
1
COMP IN = 1.6 TO 0.8 V
COMP OUT (V)
2
4
TEMPERATURE RESPONSE A
TIME (s)
0
0 5 10 15 20
3
1
TA = 25 TO 85 C
TSET = 75 C
COMP OUT (V)
2
4
TEMPERATURE RESPONSE B
TIME (s)
0
0 5 10 15 20
3
1
TA = 25 TO 85 C
TSET = 80 C
COMP OUT (V)
2
4
TEMPERATURE RESPONSE C
TIME (s)
0
0 5 10 15 20
3
1
TA = 25 TO -30 C
TSET = -20 C
COMP OUT (V)
2
4
TEMPERATURE RESPONSE D
TIME (s)
0
0 5 10 15 20
3
1
TA = 25 TO -30 C
TSET = -25 C
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
T
A
= 25
C, V
CC
= 3 V, V
CONT
= 2.4 V, I
OUT
= 40
A, unless otherwise specified.
Page 6
January 1999 TOKO, Inc.
TK11051
The hysteresis voltage (V
SH
) of the comparator can be
calculated as follows:
(5)
where I
SH
= 1.25
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
DRRDRDROP
EXTERNAL RESISTORS R
1
AND R
2
The temperature set point (T
SET
) and hysteresis (T
SH
) of
the TK11051 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
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
V
SH
=
R
1
+ R
2
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
T
SET
T
SH
FIGURE 1
R
1
= 19.68 k = 20 k
R
1
=
353 x1.25
- ( 353
- 5)
x 0.1
1.6
x 5
R
2
=
1.6 -19.68 k x 0.1
- 353 x 4 m
353
x 4 m x 19.68 k
R
2
= 149.39 k = 150 k
January 1999 TOKO, Inc.
Page 7
TK11051
2. For Set Temperatures < 25
C
(9)
(10)
Example:
R
1
and R
2
when set temperature is -25
C (T
SET
= 248
K)
and temperature hysteresis (T
SH
) is 5
C.
PACKAGE POWER DISSIPATION (P
D
)
The power dissipation rating of 200 mW represents the
amount of power the device can dissipate without damage
to the IC. Power dissipation should be kept to a minimum
to reduce temperature errors due to self-heating.
APPLICATION HINTS (CONT.)
R
1
=
(T
SET
+ T
SH
) x
I
SH
- T
SET
x I
IB
V
ref
x T
SH
R
2
=
1.6 - 27.45 k x 1.25
- 248 x 4 m
248 x 4 m x 27.45 k
R
2
= 47.47 k = 47 k
R
2
=
V
ref
- R
1
x I
SH
- T
SET
x T
C
T
SET
x T
C
x R
1
R
1
= 27.45 k = 27 k
R
1
=
(248 + 5) x
1.25
- 248 x 0.1
1.6
x 5
Page 8
January 1999 TOKO, Inc.
TK11051
0.95
0.95
0.32
e
e
M
0.1
3.5
1.2
0.15
0.3
3.3
2.2
0.4
0.95
0.95
3.0
e
e
e1
0.6
1.0
Recommended Mount Pad
1
2
3
4
5
6
0 - 0.1
15 max
1.4 max
Marking
+0.15
- 0.05
+0.3
- 0.1
+ 0.3
(3.4)
+0.15
- 0.05
Dimensions are shown in millimeters
Tolerance: x.x =
0.2 mm (unless otherwise specified)
0.1
Marking Information
Marking
TK11051
51C
SOT-23L (SOT-23L-6)
PACKAGE OUTLINE
Printed in the USA
1999 Toko, Inc.
All Rights Reserved
TOKO AMERICA REGIONAL OFFICES
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
IC-xxx-TK11051
0798O0.0K
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its
products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of
third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: (203) 748-6871
Fax: (203) 797-1223
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
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