TOKO TK11052MTL

TK11052
THERMOSTAT IC
FEATURES
APPLICATIONS
■ Internal Temperature Sensor, Voltage Reference
and Two Comparators with
■ Temperature Threshold and Hysteresis Set by Only
Two External Resistors
■ Output Logic:
Low to High with Increasing Temp. by OUTPUT1
High to Low with Increasing Temp. by OUTPUT2
■ Very Wide Operating Supply Range
(VCC = 2.7 to 6.0 V)
■ Miniature Package (SOT23L-8)
■ Minimum External Parts Count
■ Low Power Consumption
■ Very Wide Temperature Range
■
■
■
■
■
■
■
Home and Industrial Thermostats
Home Appliance Temperature Control
Notebook Computer Temperature Monitor
Pentium Processor Temperature Monitor
Power Supply Overtemperature Protection
Copy Machine Overtemperature Protection
System Overtemperature Protection
DESCRIPTION
TK11052
The TK11052 is an accurate temperature controller IC for
use over the -30 to +105 °C temperature range. The
TK11052 monolithic bipolar integrated circuit contains a
temperature sensor, stable voltage reference and two
comparators, making the device very useful as an on/off
thermostat. Two external resistors easily set the sensing
temperature threshold and hysteresis of each thermostat.
Its wide operating voltage range of 2.7 to 6.0 V makes this
IC suitable for a number of applications requiring an
accurate thermostat.
INPUT1
OUTPUT1
INPUT2
OUTPUT2
01S
GND
VCC
NC
VREF
The TK11052 is available in a miniature SOT23L-8 surface
mount package.
BLOCK DIAGRAM
I
IB1
ORDERING INFORMATION
ISINK1
-
I
SH1
COMP1
+
I
IB2
TK11052MTL
ISINK2
+
Tape/Reel Code
I
SH2
COMP2
TEMPERATURE
SENSOR
TC = 6.1 mV/ °C
TAPE/REEL CODE
TL: Tape Left
July 1999 TOKO, Inc.
I
OUT
Vref = 1.597 V
REFERENCE
VOLTAGE
Page 1
TK11052
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................... 10 V
Power Dissipation .............................................. 200 mW
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range .................-30 to +105 °C
Operating Voltage Range .............................. 2.7 to 6.0 V
Junction Temperature .......................................... 150 °C
Lead Soldering Temperature (10 s) ..................... 235 °C
TK11052 ELECTRICAL CHARACTERISTICS
Test conditions: TA = 25 °C, VCC = 3.0 V, IOUT = 80 µA, ROUT1 = 300 kΩ, ROUT2 = 300 kΩ, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
ICC
Supply Current
OUT1: CLH, OUT2: CLL
Vref
Reference Voltage
(Pin 4)
IOUT
Output Current (Vref)
Load Reg < 12 mV (Pin 4)
Line Reg
Line Regulation (Vref)
VCC = 3 V to 6 V (Pin 4)
Load Reg
Load Regulation (Vref)
IOUT = 0 µA to 500 µA (Pin 4)
VTEMP
Temperature Sensor (internal)
MIN
TYP
MAX
UNITS
280
350
µA
1.597
-9
V
80
500
µA
0
+9
mV
3
12
mV
TA = 25 ° C
645
mV
TA = 85 ° C
1011
mV
TA = 0 ° C
492.5
mV
6.1
mV/° C
TC
Temperature Coefficient
(internal)
TA = 0 ° C to 85 ° C
TERR
Total Temperature Error
TA = 0 ° C to 85 ° C (Note 1)
-4.0
CLH
Comparator Output High Level
(Note 2)
2.8
CLL
Comparator Output Low Level
ISINK ≤ 500 µA (Note 2)
IIB1
Input Bias Current 1
OUT1: CLH
-50
ISH1
Hysteresis Set Current 1
OUT1: CLL
IIB2
Input Bias Current 2
ISH2
ISINK
0
4.0
°C
V
0.3
V
0
50
nA
0.9
1.35
1.8
µA
OUT2: CLL
-50
0
50
µA
Hysteresis Set Current 2
OUT2: CLH
0.9
1.35
1.8
µA
Output Sink Current
CLL ≤ 0.3 V, (Pin 7, Pin 8)
10
500
µA
Note 1: This spec. is an error between a temp. to which the comparator reverses and a set temp. The resistance values of Ra, Rb, Rc, Rd can be
calculated as follows:
Ra or Rc =
Rb or Rd =
VREF x TSM x TC
(0.4925 + TSET x TC) x ISH
VREF x TSH x TC
(VREF - 0.4925 - TSET x TC) x ISH
Note 2: When VTEMP < INPUT1, OUTPUT1 > 2.8 V (CLH). When VTEMP > INPUT1, OUTPUT1 < 0.3 V (CLL).
When VTEMP < INPUT2, OUTPUT2 < 0.3 V (CLL). When VTEMP > INPUT2, OUTPUT2 > 2.8 V (CLH).
Page 2
July 1999 TOKO, Inc.
TK11052
TEST CIRCUIT
V
CC
C = 0.1 µF
b
R
b
C = 0.1 µF
d
R
d
R
R
V
a
CC
R
R
OUT1
OUTP
OUT2
OUTP
c
V
CC
1 µF
V
ref
Cref = 0.1 µF
Note: For information on Cb and Cd, see Applications Hints Section.
July 1999 TOKO, Inc.
Page 3
TK11052
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, VCC = 3 V, IOUT = 80 µA, unless otherwise specified.
1.64
1.2
1.62
1.0
1.60
1.58
1.54
0.2
0
25
50
75 100
-25
0
25
50
75
100
TA (°C)
TA (°C)
TOTAL TEMPERATURE ERROR vs.
TEMPERATURE
SUPPLY CURRENT vs.
TEMPERATURE
2
300
1
290
ICC (µA)
TERR ( C)
0.6
0.4
0
-1
270
260
-3
250
0
25
50
75
OUTPUT1 = "H"
OUTPUT2 = "L"
280
-2
-25
100
-25
0
25
50
75
100
TA (°C)
TA (°C)
HYSTERESIS SET CURRENT vs.
TEMPERATURE
INPUT BIAS CURRENT vs.
TEMPERATURE
2.5
5
2.0
4
IIB (nA)
ISH (µA)
0.8
1.56
-25
1.5
1.0
3
2
0.5
1
0
0
-25
0
25
50
TA (°C)
Page 4
TEMPERATURE SENSOR vs.
TEMPERATURE
VTEMP (V)
Vref (V)
REFERENCE VOLTAGE vs.
TEMPERATURE
75
100
-25
0
25
50
75
100
TA (°C)
July 1999 TOKO, Inc.
TK11052
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, VCC = 3 V, IOUT = 80 µA, unless otherwise specified.
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
2
340
1
320
ICC (V)
LINE REG (mV)
LINE REGULATION
0
-1
0
240
4
5
6
7
3
8
4
5
6
7
8
VCC (V)
VCC (V)
OUTPUT 1 vs. SUPPLY VOLTAGE
OUTPUT 1 vs. SUPPLY VOLTAGE
when CLH
2.0
1.5
1.0
2.0
1.5
1.0
0.5
0.5
0
0
0
0.5
1.0 1.5 2.0
when CLL
2.5
OUTPUT1 (V)
OUTPUT1 (V)
280
260
2.5
2.5
0
0.5
1.0 1.5
2.0 2.5
VCC (V)
VCC (V)
OUTPUT 2 vs. SUPPLY VOLTAGE
OUTPUT 2 vs. SUPPLY VOLTAGE
when CLH
2.5
2.0
1.5
1.0
2.0
1.5
1.0
0.5
0.5
0
0
0
0.5
1.0 1.5 2.0
VCC (V)
July 1999 TOKO, Inc.
when CLL
2.5
OUTPUT2 (V)
OUTPUT2 (V)
300
-2
3
OUTPUT1 = "H"
OUTPUT2 = "L"
2.5
0
0.5
1.0 1.5
2.0 2.5
VCC (V)
Page 5
TK11052
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, VCC = 3 V, IOUT = 80 µA, unless otherwise specified.
COMPARATOR OUTPUT LOW LEVEL
vs. OUTPUT SINK CURRENT
2
125
1
100
CLL (mV)
LOAD REG (mA)
LOAD REGULATION
0
-1
75
50
-2
25
-3
0
0
0.1
0.2
0.3 0.4
0.5
0
0.2
IOUT (mA)
Vref - GND
Cref = 0 F
RR (dB)
RR (dB)
Vref - GND
Cref= 0.1 µF
100
80
60
40
60
40
20
20
0
0
10 100
1k
10k 100k 1M
10 100
1k
frr (Hz)
SUPPLY VOLTAGE RESPONSE
2.0
1.6
1.6
VREF (V)
2.0
1.2
0.8
0.8
0.4
0
0
1
2
3
VCC (V)
4
5
VCC = 0 V to 3 V
1.2
0.4
0
10k 100k 1M
frr (Hz)
REFERENCE VOLTAGE vs.
SUPPLY VOLTAGE
VREF (V)
1.0
RIPPLE REJECTION (Vref) vs.
FREQUENCY
80
Page 6
0.6 0.8
ISINK (mA)
RIPPLE REJECTION (Vref) vs.
FREQUENCY
100
0.4
0
0.1
0.2 0.3
0.4 0.5
TIME (msec)
July 1999 TOKO, Inc.
TK11052
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, VCC = 3 V, IOUT = 80 µA, unless otherwise specified.
OUTPUT 1 vs. TEMPERATURE
TSET = 50 °C
T
SH = 5 °C
4
3
2
3
2
1
0
0
40
45
50
55
60
35
40
45
50
55
60
TA (°C)
TA (°C)
TEMPERATURE RESPONSE A
TEMPERATURE RESPONSE B
TA = 25 °C to 85 °C
T
SET = 75 °C
5
4
3
2
4
3
2
1
1
0
0
0
5
10
15
20
TA = 25 °C to 85 °C
T
SET = 80 °C
5
OUTPUT1 (V)
OUTPUT1 (V)
4
1
35
TSET = 50 °C
T
SH = 5 °C
5
OUTPUT2 (V)
OUTPUT1 (V)
5
25
0
5
10
15
20
25
TIME (sec)
TIME (sec)
TEMPERATURE RESPONSE C
TEMPERATURE RESPONSE D
TA = 25 °C to -30 °C
T
SET = -20 °C
5
4
3
2
4
3
2
1
1
0
0
0
5
10
15
TIME (sec)
July 1999 TOKO, Inc.
20
25
TA = 25 °C to -30 °C
T
SET = -25 °C
5
OUTPUT1 (V)
OUTPUT1 (V)
OUTPUT 2 vs. TEMPERATURE
0
5
10
15
20
25
TIME (sec)
Page 7
TK11052
APPLICATION HINTS
EXTERNAL RESISTORS Ra , Rb , Rc , and Rd
(6)
The temperature set point (TSET) and hysteresis (TSH) of
the TK11052 are easily set by external resistors Ra , Rb ,
Rc , and Rd. See Figure 1 for clarification of TSET and TSH.
Ra =
=
Vref x TSH x TC
(0.4925 + TSET x TC) x ISH
1.597 x TSH x 6.1 m
(0.4925 + TSET x 6.1 m) x 1.35 µ
TSET
≈
TSH
The set voltage (VSET) of the comparator at the set
temperature (TSET) is calculated as follows:
Rb is calculated by Equations (3) and (6)
(7)
Rb =
VSET = 0.4925 + TSET x TC
where TC = 6.1 mV/°C
=
1. For Set Temperatures ≥ 25 °C
VSET =
Rb
Rb is calculated by Equations (1) and (2), resulting in:
(3)
Rb =
0.4925 + TSET x TC
VREF - 0.4925 - TSET x TC
x Ra
The hysteresis voltage (VSH) of the comparator can be
calculated as follows:
(4)
VSH =
Ra x Rb
(R +R
a
b
)x I
SH
where ISH = 1.35 µA
Rb is calculated by Equation (4)
Ra x VSH
Rb =
(5)
Ra x ISH - VSH
(1.597 - 0.4925 - TSET x 6.1 m) x 1.35 µ
≈
1183 x TSH
181.07 - TSET
x 103
Ra and Rb when set temperature is 85 °C and temperature
hysteresis is 5 °C.
Ra =
1183 x TSH
80.74 + TSET
x 103 =
1183 x 5
80.74 + 85
x 103
= 35.69 k ≈ 36 kΩ
Rb =
1183 x TSH
181.07 - TSET
x 103 =
1183 x 5
x 103
181.07 - 85
= 61.57 k ≈ 62 kΩ
2. For Set Temperatures < 25 °C
VREF x TSH x TC
(8)
Ra =
(0.4925 + TSET x TC - TSH x TC) x ISH
Ra is calculated by Equations (3) and (5)
=
Page 8
(VREF - 0.4925 - TSET x TC) x ISH
Example:
x VREF
Ra + Rb
Vref x TSH x TC
1.597 x TSH x 6.1 m
The set voltage (VSET) of the comparator at the reference
voltage and external resistances is calculated as follows:
(2)
x 103
80.74 + TSET
where ISH = 1.35 µA, TC = 6.1 mV and VREF = 1.597 V
FIGURE 1
(1)
1183 x TSH
1183 x TSH
80.74 + (TSET - TSH)
x 103
July 1999 TOKO, Inc.
TK11052
APPLICATION HINTS (CONT.)
(9)
Rb =
VREF x TSH x TC
(0.4925 + TSET x TC - TSH x TC) x ISH
=
1183 x TSH
181.07 - (TSET - TSH)
x 103
Example:
Ra and Rb when set temperature is 0 °C and temperature hysteresis is 5 °C.
Ra =
Rb =
1183 x TSH
80.74 + (TSET - TSH)
1183 x TSH
181.07 - (TSET - TSH)
x 103
= 78.096 x 103 ≈ 78.1 kΩ
x 103
= 31.789 x 103 ≈ 31.8 kΩ
Thermostat IC Application
Example:
• WINDOW TYPE OUTPUT
The following application protects the circuit within the operating temperature range of 0 to 85 °C. When the temperature
is 0 °C or less, or 85 °C or more, the N channel Mos transistor is turned OFF.
When the temperature returns to between 5 and 80 °C by the hysteresis function, the N channel Mos transistor is turned
ON.
VCC
36 kΩ
31.8 kΩ 78.1 kΩ
VCC
IN1
IN2
VCC
Vref
TK11052M
62 kΩ
OUT1 "H"
"L"
"H"
OUT1
300 kΩ
OUT2 "L"
OUT2
"H"
Protected
Circuit
GND
OUT1 + OUT2 "L"
"L"
0
NC
10
80
90
Temperature (°C)
• TEMPERATURE FUSE
The following application is a temperature fuse circuit. The output of the TK11052M becomes a High Level when the
surrounding temperature exceeds 85 °C and the P channel Mos transistor is turned off. Even if the surrounding
temperature drops, the P channel Mos transistor remains off.
1.011 V
OUT1
62 kΩ
IN2
VCC
VCC
0.1 µF
32 kΩ
Vref
July 1999 TOKO, Inc.
TK11052M
IN1
OUT1
VCC
"L"
VCC
300 kΩ
"H"
OUT2
OUT2
GND
NC
Protected
Circuit
"L"
0
10
80
90
Temperature (°C)
Page 9
TK11052
APPLICATION HINTS (CONT.)
Comparator Output Level in the Hysteresis Area
When the power supply voltage is applied with the ambient temperature in the hysteresis area, the state of the comparator
output level is uncertain.
A capacitor is connected between Pin1 (Pin 2) to GND or Pin 4 to Pin 1 (Pin 2) to fix the comparator output level.
OUTPUT2
HYSTERESIS AREA
OUTPUT1
HYSTERESIS AREA
TSET - TSH
TA
TSET
TSET - TSH
Temperature (°C)
Pin1 to GND
Pin 2 to GND
OUTPUT1: Low Level
OUTPUT2: High Level
Pin 1 to Pin 4
Pin 2 to Pin 4
See following
OUTPUT1: High Level
OUTPUT 2: Low Level
VCC
"H"
Rd
Rc
VCC
Page 10
VCC
"H"
Rb
Ra
Rd
Rc
VCC
"L"
VCC
"L"
Ra
TSET
Temperature (°C)
VCC
Rb
TA
July 1999 TOKO, Inc.
TK11052
APPLICATION HINTS (CONT.)
Noise Reduction
When the thermostat IC is operated in a noisy environment (e.g., motor, fan, etc.), the noise on the signal lines may exceed
the limits of the comparator hysteresis window. This results in erratic comparator output levels. This can be corrected by
adding 0.1 µF capacitors from Pin 1 to GND (or Pin 4), Pin 2 to GND (or Pin 4), and Pin 4 to GND as shown below. The
configuration is determined by the desired comparator output level during power-up in the hysteresis area as described
earlier.
V
CC
C = 0.1 µF
b
R
b
C = 0.1 µF
d
R
d
R
R
V
a
CC
R
R
OUT1
OUTPUT1
OUT2
OUTPUT2
c
V
CC
1 µF
V
ref
Cref = 0.1 µF
July 1999 TOKO, Inc.
Page 11
TK11052
PACKAGE OUTLINE
Marking Information
SOT-23L (SOT23L-8)
TK11052
Marking
52C
0.45
5
1.0
8
e1 3.0
marking
e 0.8
1
4
Recommended Mount Pad
+0.15
- 0.05
e 0.8
0.3
0.1
M
+0.3
3.5 - 0.1
2.2
15 max
1.2
+0.15
- 0.05
0.4
+ 0.3
0.15
0.1
0 - 0.1
1.4max
0.3
(3.4)
3.3
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
TOKO AMERICA REGIONAL OFFICES
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
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
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.
Page 12
© 1999 Toko, Inc.
All Rights Reserved
July 1999 TOKO, Inc.
IC-xxx-TK11052
0798O0.0K
Printed in the USA