Datasheet TK11052MTL Datasheet (TOKO)

TK11052

THERMOSTAT IC

FEATURES

■ 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

(V

= 2.7 to 6.0 V)

CC

■ Miniature Package (SOT23L-8)

■ Minimum External Parts Count

■ Low Power Consumption

■ Very Wide Temperature Range

DESCRIPTION

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.

APPLICATIONS

■ 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

TK11052

INPUT1

INPUT2

01S

V

CC

V

REF

OUTPUT1

OUTPUT2

GND

NC

The TK11052 is available in a miniature SOT23L-8 surface mount package.

BLOCK DIAGRAM

ORDERING INFORMATION

TK11052MTL

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

V

ref

I

IB1

I

SH1

I

IB2

I

SH2

I

OUT

= 1.597 V

COMP1

+

COMP2

+

-

TEMPERATURE

SENSOR

TC = 6.1 mV/ °C

REFERENCE

VOLTAGE

I

SINK1

I

SINK2

July 1999 TOKO, Inc. 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

TK11052 ELECTRICAL CHARACTERISTICS

Test conditions: TA = 25 °C, V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 3.0 V, I

CC

= 80 µA, R

OUT

Operating Voltage Range.............................. 2.7 to 6.0 V

Junction Temperature .......................................... 150 °C

Lead Soldering Temperature (10 s) ..................... 235 °C

= 300 kΩ, R

OUT1

= 300 kΩ, unless otherwise specified.

OUT2

I

CC

V

fer

I

TUO

geReniLV(noitalugeReniL

geRdaoLV(noitalugeRdaoL

V

PMET

T

C

T

RRE

C

HL

C

LL

I

1BI

I

1HS

I

2BI

I

2HS

I

KNIS

tnerruCylppuSC:1TUO

egatloVecnerefeR)4niP(795.1V

V(tnerruCtuptuO

))4niP(Vm21<geRdaoL08005Aµ

fer

)V

fer

)I

fer

)lanretni(

1tnerruCsaiBtupnIC:1TUO

2tnerruCsaiBtupnIC:2TUO

tnerruCkniStuptuOC

HL

CC

TUO

T

A

)lanretni(rosneSerutarepmeT

T

A

T

A

tneiciffeoCerutarepmeT

rorrEerutarepmeTlatoTT

T

A

C°52=546Vm C°58=1101Vm

C°0=5.294Vm

C:2TUO,

LL

)4niP(V6otV3=9-09+Vm

)4niP(Aµ005otAµ0=321Vm

C°58otC°0=1.6C°/Vm

)1etoN(C°58otC°0=0.4-00.4C°

leveLhgiHtuptuOrotarapmoC)2etoN(8.2V

leveLwoLtuptuOrotarapmoCI

1tnerruCteSsiseretsyHC:1TUO

2tnerruCteSsiseretsyHC:2TUO

≤ )2etoN(Aµ0053.0V

KNIS

HL

LL

HL

≤ )8niP,7niP(,V3.001005Aµ

LL

082053Aµ

05-005An

9.053.18.1Aµ 05-005Aµ

9.053.18.1Aµ

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:

V

x TSM x T

Note 2: When V When V

Ra or Rc =

Rb or Rd =

< INPUT1, OUTPUT1 > 2.8 V (CLH). When V

TEMP

< INPUT2, OUTPUT2 < 0.3 V (CLL). When V

TEMP

(V

REF

(0.4925 + T

V

x TSH x T

REF

- 0.4925 - T

REF

x TC) x I

SET

C

SH

C

x TC) x I

SH

> INPUT1, OUTPUT1 < 0.3 V (CLL).

TEMP

> INPUT2, OUTPUT2 > 2.8 V (CLH).

TEMP

Page 2 July 1999 TOKO, Inc.

TK11052

P

TEST CIRCUIT

Cb = 0.1 µF

R

b

Cd = 0.1 µF

R

d

V

CC

Note: For information on Cb and Cd, see Applications Hints Section.

R

1 µF

V

a

c

ref

C

= 0.1 µF

ref

V

CC

R

OUT1

V

OUT

CC

R

OUT2

OUT

July 1999 TOKO, Inc. Page 3

TK11052

V

(V)

V

(V)

T

( C)

I

(

A)

I

(

A)

I

(

A)

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, VCC = 3 V, I

= 80 µA, unless otherwise specified.

OUT

REFERENCE VOLTAGE vs.

TEMPERATURE

1.64

1.62

1.60

ref

1.58

1.56

1.54

-25 0 25 50 75 100 TA (°C)

TOTAL TEMPERATURE ERROR vs.

2

1 0

-1

ERR

-2

TEMPERATURE

1.2

0.8

0.6

TEMP

0.4

0.2

300

290

280

µ

270

CC

260

TEMPERATURE SENSOR vs.

TEMPERATURE

1.0

-25 0 25 50 75 100 TA (°C)

SUPPLY CURRENT vs.

TEMPERATURE

OUTPUT1 = "H" OUTPUT2 = "L"

µ

SH

-3

-25 0 25 50 75 100 TA (°C)

HYSTERESIS SET CURRENT vs.

TEMPERATURE

2.5

2.0

1.5

1.0

0.5

0

-25 0 25 50 75 100 TA (°C)

n

250

-25 0 25 50 75 100 TA (°C)

INPUT BIAS CURRENT vs.

TEMPERATURE

5 4 3

IB

2 1

0

-25 0 25 50 75 100 TA (°C)

Page 4 July 1999 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

LINE

REG

(

V)

OUTPUT1

(V)

OUTPUT1

(V)

OUTPUT2

(V)

OUTPUT2

(V)

TA = 25 °C, VCC = 3 V, I

LINE REGULATION

= 80 µA, unless otherwise specified.

OUT

SUPPLY CURRENT vs.

SUPPLY VOLTAGE

TK11052

2

1

m

0

-1

-2 0

3 4 5 6 7 8

VCC (V)

OUTPUT 1 vs. SUPPLY VOLTAGE

2.5

2.0

1.5

1.0

0.5

when C

LH

340

320 300

(V)

CC

280

I

260 240

3 4 5 6 7 8

OUTPUT 1 vs. SUPPLY VOLTAGE

2.5

2.0

1.5

1.0

0.5

OUTPUT1 = "H" OUTPUT2 = "L"

VCC (V)

when C

LL

0

0 0.5 1.0 1.5 2.0 2.5

VCC (V)

OUTPUT 2 vs. SUPPLY VOLTAGE

2.5

2.0

1.5

1.0

0.5 0

0 0.5 1.0 1.5 2.0 2.5

when C

VCC (V)

LH

0

0 0.5 1.0 1.5 2.0 2.5

VCC (V)

OUTPUT 2 vs. SUPPLY VOLTAGE

2.5

2.0

1.5

1.0

0.5 0

0 0.5 1.0 1.5 2.0 2.5

VCC (V)

when C

LL

July 1999 TOKO, Inc. Page 5

TK11052

LOAD

REG

(

A)

C

(

V)

(dB)

(dB) V

(V)

V

(V)

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, VCC = 3 V, I

= 80 µA, unless otherwise specified.

OUT

m

RR

LOAD REGULATION

2

1 0

-1

-2

-3

0 0.1 0.2 0.3 0.4 0.5

I

OUT

RIPPLE REJECTION (V

FREQUENCY

100

80 60

40 20

(mA)

V

ref

C

ref

- GND = 0 F

ref

) vs.

COMPARATOR OUTPUT LOW LEVEL

vs. OUTPUT SINK CURRENT

125

100

75

m

LL

50 25

0

0 0.2 0.4 0.6 0.8 1.0

I

(mA)

SINK

RIPPLE REJECTION (V

FREQUENCY

V

- GND

100

C

ref

= 0.1 µF

80 60

40

RR

20

ref

) vs.

0

10 100 1k 10k 100k 1M

frr (Hz)

0

10 100 1k 10k 100k 1M

frr (Hz)

REFERENCE VOLTAGE vs.

REF

SUPPLY VOLTAGE

2.0

1.6

1.2

0.8

0.4 0

0 1 2 3 4 5

V

CC

REF

(V)

SUPPLY VOLTAGE RESPONSE

2.0

VCC = 0 V to 3 V

1.6

1.2

0.8

0.4 0

0 0.1 0.2 0.3 0.4 0.5

TIME (msec)

Page 6 July 1999 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

OUTPUT1

(V)

OUTPUT2

(V)

OUTPUT1

(V)

OUTPUT1

(V)

OUTPUT1

(V)

OUTPUT1

(V)

TA = 25 °C, VCC = 3 V, I

= 80 µA, unless otherwise specified.

OUT

TK11052

OUTPUT 1 vs. TEMPERATURE

T

5

4 3

2 1

0

35 40 45 50 55 60

TEMPERATURE RESPONSE A

5

4 3

2

SET = 50 °C

T

SH = 5 °C

TA (°C)

T

A = 25 °C to 85 °C

T

SET = 75 °C

OUTPUT 2 vs. TEMPERATURE

T

5

4 3

2 1

0

35 40 45 50 55 60

TEMPERATURE RESPONSE B

5

4 3

2

SET = 50 °C

T

SH = 5 °C

TA (°C)

T

A = 25 °C to 85 °C

T

SET = 80 °C

1 0

0 5 10 15 20 25

TIME (sec)

TEMPERATURE RESPONSE C

5

4 3

2 1

0

0 5 10 15 20 25

TIME (sec)

T

A = 25 °C to -30 °C

T

SET = -20 °C

1 0

0 5 10 15 20 25

TIME (sec)

TEMPERATURE RESPONSE D

T

5

4 3

2 1

0

0 5 10 15 20 25

A = 25 °C to -30 °C

T

SET = -25 °C

TIME (sec)

July 1999 TOKO, Inc. Page 7

TK11052

APPLICATION HINTS

EXTERNAL RESISTORS Ra , Rb , Rc , and R

The temperature set point (T

) and hysteresis (TSH) of

SET

the TK11052 are easily set by external resistors Ra , Rb , Rc , and Rd. See Figure 1 for clarification of T

d

and TSH.

SET

(6)

Ra =

(0.4925 + T

=

(0.4925 + T

V

x TSH x T

ref

x TC) x I

SET

C

1.597 x TSH x 6.1 m x 6.1 m) x 1.35 µ

SET

SH

T

SET

T

SH

FIGURE 1

The set voltage (V temperature (T

(1)

SET

V

= 0.4925 + T

SET

) of the comparator at the set

SET

) is calculated as follows:

x T

SET

C

where TC = 6.1 mV/°C

1. For Set Temperatures ≥ 25 °C

The set voltage (V

) of the comparator at the reference

SET

voltage and external resistances is calculated as follows:

R

(2)

V

SET

=

b

Ra + R

x

V

REF

b

Rb is calculated by Equations (1) and (2), resulting in: (3)

Rb =

0.4925 + T

V

- 0.4925 - T

REF

SET

x T

SET

C

x T

C

x R

a

1183 x T

≈

80.74 + T

where ISH = 1.35 µA, TC = 6.1 mV and V

SH

SET

x 10

3

= 1.597 V

REF

Rb is calculated by Equations (3) and (6) (7)

Rb =

(VREF - 0.4925 - T

=

(1.597 - 0.4925 - T

1.597 x TSH x 6.1 m

1183 x T

≈

181.07 - T

ref

C

x TC) x I

SET

x 6.1 m) x 1.35 µ

SET

SH

SET

x 10

3

SH

V

x TSH x T

Example: Ra and Rb when set temperature is 85 °C and temperature

hysteresis is 5 °C.

Ra = x 103 =

1183 x T

80.74 + T

SH

x 10

SET

1183 x 5

80.74 + 85

3

The hysteresis voltage (VSH) of the comparator can be

= 35.69 k ≈ 36 kΩ

calculated as follows: (4)

VSH =

(

where ISH = 1.35 µA

Ra x R Ra + R

b

I

x

SH

)

b

Rb = x 103 =

= 61.57 k ≈ 62 kΩ

1183 x T

181.07 - T

SH

x 10

SET

1183 x 5

181.07 - 85

Rb is calculated by Equation (4)

Ra x V

(5)

Rb =

Ra x I

SH

- V

SH

Ra is calculated by Equations (3) and (5)

2. For Set Temperatures < 25 °C

V

x TSH x T

(8)

Ra =

(0.4925 + T

= x 10

80.74 + (T

REF

SET

1183 x T

SET

x TC - TSH x TC) x I

SH

- TSH)

C

SH

3

Page 8 July 1999 TOKO, Inc.

3

APPLICATION HINTS (CONT.)

TK11052

1183 x T

181.07 - (T

SH

SET

- TSH)

3

(9)

Rb =

V

(0.4925 + T

x TSH x T

REF

x TC - TSH x TC) x I

SET

C

= x 10

SH

Example: Ra and Rb when set temperature is 0 °C and temperature hysteresis is 5 °C.

Ra = x 10

Rb = x 10

1183 x T

80.74 + (T

1183 x T

181.07 - (T

SET

SH

- TSH)

SH

- TSH)

3

= 78.096 x 103 ≈ 78.1 kΩ

3

= 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.

36 kΩ62 kΩ

31.8 kΩ 78.1 kΩ

V

CC

TK11052M

IN1 OUT1

IN2 OUT2

V

CC GND

V

ref NC

300 kΩ

V

CC

Protected

Circuit

OUT1 + OUT2

"H"

OUT1

"L"

OUT2

"H"

"L" "L"

010 8090

Temperature (°C)

"L" "H"

• 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

62 kΩ

V

CC

300 kΩ

Protected

CC

Circuit

TK11052M

IN1 OUT1

IN2 OUT2

V

CC

V

CC GND

32 kΩ0.1 µF

V

ref NC

OUT1

OUT2

"L"

010 8090

Temperature (°C)

"L"

"H"

July 1999 TOKO, Inc. 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.

OUTPUT1

HYSTERESIS AREA

T

- T

SET

TAT

SH

Temperature (°C)

Pin1 to GND OUTPUT1: Low Level Pin 2 to GND OUTPUT2: High Level

Pin 1 to Pin 4 OUTPUT1: High Level Pin 2 to Pin 4 OUTPUT 2: Low Level See following

R

b

a

SET

OUTPUT2

HYSTERESIS AREA

T

- T

SET

TAT

SH

SET

Temperature (°C)

V

CC

"L"

V

CC

R

b

R

a

V

CC

"H"

V

CC

R

d

R

c

CC

V

"H"

R

d

c

CC

V

"L"

Page 10 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

V

CC

R

OUT1

OUTPUT1

R

OUT2

OUTPUT2

Cb = 0.1 µF

Cd = 0.1 µF

V

CC

R

b

R

d

R

1 µF

V

a

c

ref

C

= 0.1 µF

ref

July 1999 TOKO, Inc. Page 11

TK11052

PACKAGE OUTLINE

SOT-23L (SOT23L-8)

8

1

e

0.8

+0.3

- 0.1

3.5

(3.4)

Dimensions are shown in millimeters Tolerance: x.x = ± 0.2 mm (unless otherwise specified)

Marking Information

Marking TK11052 52C

0.45

5

marking

4

+0.15

- 0.05

0.3

0.1

1.4max

M

1.2

0 - 0.1

+0.15

0.3

- 0.05

0.15

1.0

Recommended Mount Pad

3.0 1

e

0.8

e

2.2

15 max

+ 0.3

3.3

0.4

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 July 1999 TOKO, Inc.

IC-xxx-TK11052

0798O0.0K

Printed in the USA