Datasheet TK11051MTL Datasheet (TOKO)

TK11051

01S

TEMPERATURE CONTROLLER IC

FEATURES

■ Internal Temperature Sensor, Voltage Reference

and Comparator

■ Temperature Threshold and Hysteresis Set by Only

Two External Resistors

■ Output Logic: High to Low with Increasing Temp.

■ Active High On/Off Control

■ 2.7 to 6.0 V Supply Range

■ Miniature Package (SOT-23L-6)

■ Minimum External Parts Count

■ Low Power Consumption

■ Very Wide Temperature Range

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.

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

TK11051

V

CONT

V

CC

V

REF

COMP OUT

GND

COMP IN

The TK11051 is available in a miniature SOT-23L-6 surface mount package.

BLOCK DIAGRAM

ORDERING INFORMATION

V

CONT

TK11051MTL

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

January 1999 TOKO, Inc. Page 1

V

REF

COMP IN

ON/OFF CIRCUIT

VOLTAGE

REFERENCE

V

PTAT

+

-

TEMPERATURE

SENSOR

V

CC

COMP OUT

GND

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

TK11050 ELECTRICAL CHARACTERISTICS

Test conditions: TA = 25 °C, V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 3.0 V, V

CC

CONT

= 2.4 V, I

Operating Voltage Range................................. 2.7 to 6 V

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

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

= 40 µA, R3 = 100 kΩ, unless otherwise specified.

OUT

I

CC

I

YBTS

V

TATP

T

C

T

RRE

C

HL

C

LL

I

BI

I

HS

I

TUO

V

fer

V

fer

)4etoN(

tnerruCtnecseiuQ

HGIHtuptuOrotarapmoC012053Aµ

tnerruCybdnatSV

egatloVrosneSerutarepmeT

tneiciffeoCerutarepmeTT

rorrEerutarepmeTT

≤ V6.01Aµ

TNOC

T

A

T

A

T

A

C°52=291.1V C°58=234.1V

C°03-=279.0V

C°58ot0=0.4C°/Vm

)2etoN(,C°58ot0=0.4-00.4C°

HGIHtuptuOrotarapmoC)3etoN(8.2V

WOLtuptuOrotarapmoCR

tnerruCsaiBtupnIV>NIrotarapmoC

tnerruCteSsiseretsyHV<NIrotarapmoC

tnerruCkniStuptuOC

≥ k01 Ω )3etoN(,3.0V

3

TATP

≤ V3.003003Aµ

LL

SCITSIRETCARAHCLANIMRET

egatloVecnerefeRT

A

C°52=6.1V

1.03.0Aµ

9.052.16.1Aµ

WOLtuptuOrotarapmoC052053Aµ

I

fer

geReniLnoitalugeReniLV

geRdaoLnoitalugeRdaoLI

tnerruCtuptuOecnerefeRR

1R+2

CC

TUO

k04= Ω 04005Aµ

V6ot3=28Vm

Aµ005ot0=18Vm

SNOITACIFICEPSLANIMRETLORTNOC

I

TNOC

V V

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 R1 and R2 can be calculated as follows: R1 = V

Note 3: When V Note 4: V

)NO(TNOC

)FFO(TNOC

R1 x IIB - T

PTAT

SET x TC). IIB

< COMP IN, COMP OUT > 2.8 V (High Level). When V

PTAT

does not have an output pin.

tnerruClortnoC15.36Aµ

)NO(egatloVlortnoCNOtuptuO8.1V

)FFO(egatloVlortnoCFFOtuptuODNG6.0V

x T

/ (T

is 0.1 µA and ISH is 1.25 µA.

ref

SH

> COMP IN, COMP OUT < 0.3 V (Low Level).

PTAT

x ISH - (T

SET

-TSH) x IIB), R2 = T

SET

CC

x TC x R1 / (V

SET

V

ref

Page 2 January 1999 TOKO, Inc.

-

I

V

(V)

V

(V)

I

A)

I

A)

V

(V)

V

(V)

CONT

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25 °C, VCC = 3 V, V

REFERENCE VOLTAGE vs.

TEMPERATURE

R

1

2

V

CONT

V

ref

COMP IN

I

IB

I

SH

TEST CIRCUIT

ON/OFF

CIRCUIT

VOLTAGE

REFERENCE

R1 + R2 = 40 kΩ

= 2.4 V, I

CONT

REFERENCE VOLTAGE vs.

OUT

TEMPERATURE

I

R

100 k

CC

3

V

PTAT

TEMPERATURE

SENSOR

+

V

CC

COMP

OUT

GND

I

SINK

= 40 µA, unless otherwise specified.

TK11051

10 µF

LINE REGULATION

1.62

1.61

1.60

ref

1.59

1.58

-40 0 40 80 120 TA (°C)

LOAD REGULATION

1.62

1.61

1.60

ref

1.59

1.6

1.4

1.2

PTAT

1.0

0.8

µ

CONT

-40 0 40 80 120 TA (°C)

CONTROL CURRENT vs.

TEMPERATURE

4

3

2

1

1.62

1.61

1.60

ref

1.59

1.58

µ

CONT

2 4 6 8 10

VCC (V)

CONTROL CURRENT vs.

CONTROL VOLTAGE

4

3

2

1

1.58 0 0.2 0.4 0.6 0.8

I

ref

(mA)

0

-40 0 40 80 120 TA (°C)

0

0 0.6 1.2 1.8 2.4

V

(V)

CONT

January 1999 TOKO, Inc. Page 3

TK11051

V

(V) V

(V)

RR

(dB) RR

(dB)

I

(

A)

I

(

A)

I

(

A)

I

(

A)

V

(V)

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, VCC = 3 V, V

CONT

= 2.4 V, I

= 40 µA, unless otherwise specified.

OUT

CONTROL VOLTAGE RESPONSE A

V

= 0 TO 2.4 V

V

= 100 mVrms

RR

CONT

C

OUT

TIME (ms)

C

OUT

= 0 µF

2.0

1.5

1.0

ref

0.5

0

0 2 4 6 8

RIPPLE REJECTION RATIO B (V

80

60

40

= 0.1 µ F

ref

CONTROL VOLTAGE RESPONSE B

V

= 0 TO 2.4 V

2.0

1.5

1.0

ref

0.5

0

0 2 4 6 8

)

120

100

n

B

INPUT BIAS CURRENT vs.

80

CONT

C

OUT

TIME (ms)

TEMPERATURE

COMP IN > V

= 0 µF

PTAT

RIPPLE REJECTION RATIO A (V

V

= 100 mVrms

RR

C

OUT

f (Hz)

TEMPERATURE

COMP IN < V

µ

80

60

40

20

0

10 100 1 k 10 k 100 k

HYSTERESIS SET CURRENT vs.

1.4

1.3

1.2

SH

= 0.1 µ F

PTAT

ref

)

µ

CC

20

0

10 100 1 k 10 k 100 k

f (Hz)

SUPPLY CURRENT vs.

TEMPERATURE

260

240

220

200

180

COMP OUT = LOW LEVEL

COMP OUT = HIGH LEVEL

R1 + R2 = 40 kΩ R3 = 100 kΩ

-40 0 40 80 120 TA (°C)

60

40

-40 0 40 80 120 TA (°C)

SUPPLY CURRENT vs.

SUPPLY VOLTAGE

350

COMP OUT = LOW LEVEL

300

µ

250

CC

200

150

COMP OUT = HIGH LEVEL

2 3 4 5 6

V

CC

R1 + R2 = 40 kΩ R3 = 100 kΩ

(V)

1.1

1.0

-40 0 40 80 120 TA (°C)

REFERENCE VOLTAGE vs.

CONTROL VOLTAGE

1.6

1.2

0.8

ref

0.4

0

0 0.6 1.2 1.8 2.4

V

CONT

(V)

Page 4 January 1999 TOKO, Inc.

I

(

A)

C

(

V)

COMP

OUT

(V)

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, VCC = 3 V, V

CONT

= 2.4 V, I

= 40 µA, unless otherwise specified.

OUT

TK11051

µ

SUPPLY CURRENT vs.

CONTROL VOLTAGE

320

240

160

CC

80

0

0 0.6 1.2 1.8 2.4

V

CONT

CONTROL VOLTAGE RESPONSE

4

V

= 0 TO 2.4 V

CONT

3

2

(V)

COMPARATOR OUTPUT (LOW LEVEL)

vs. OUTPUT SINK CURRENT

160

120

m

80

LL

40

0

0 0.2 0.4 0.6 0.8

I

(mA)

OUT

COMPARATOR INPUT RESPONSE

4

COMP IN = 1.6 TO 0.8 V

3

2

COMPARATOR OUTPUT vs.

TEMPERATURE

T

4

3

2

1

0

65 70 75 80 85

TEMPERATURE RESPONSE A

4

3

2

= 80 °C

SET

TSH = 5 °C

TA (°C)

TA = 25 TO 85 C T

= 75 C

SET

COMP OUT (V)

1

0

0 2 4 6 8

TIME (ms)

TEMPERATURE RESPONSE B

TA = 25 TO 85 C

4

T

= 80 C

SET

3

2

COMP OUT (V)

1

0

0 5 10 15 20

TIME (s)

COMP OUT (V)

1

0

0 0.2 0.4 0.6 0.8

TIME (ms)

TEMPERATURE RESPONSE C

4

TA = 25 TO -30 C T

= -20 C

SET

3

2

COMP OUT (V)

1

0

0 5 10 15 20

TIME (s)

COMP OUT (V)

1

0

0 5 10 15 20

TIME (s)

TEMPERATURE RESPONSE D

4

TA = 25 TO -30 C T

= -25 C

SET

3

2

COMP OUT (V)

1

0

0 5 10 15 20

TIME (s)

January 1999 TOKO, Inc. Page 5

TK11051

APPLICATION HINTS

EXTERNAL RESISTORS R1 AND R

The temperature set point (T

SET

2

) and hysteresis (TSH) of the TK11051 are easily set by two external resistors R1 and R2. See Figure 1 for clarification of T

T

SH

and TSH.

SET

T

SET

FIGURE 1

The set voltage (V temperature (T

V

SET

) of the comparator at the set

SET

) is calculated as follows:

= T

SET

x T

C

(1) where T

That is, T

is an absolute temperature (°K).

SET

(°K) = °C + 273

SET

and TC = 4 mV/°C.

1. For Set Temperatures ≥ 25 °C

V

R2 x V

= =

SET

R1 + R

ref

2

R1 x R2 x I

R1 + R

IB

2

R

2

R1 + R

(V

x

2

ref

(2)

DRRDRDROP

- R1 x IIB)

The hysteresis voltage (VSH) of the comparator can be calculated as follows:

R1 x R

2

(I

VSH =

(

R1 + R

)

2

- IIB)

X

SH

(5) where ISH = 1.25 µA The hysteresis represented as temperature is:

(I

TSH =

R1 x R

(

R1 + R

2

x

)

2

SH

T

- IIB)

C

(6) Solving for temperature coefficient (TC):

(I

TC =

(

R1 x R R1 + R

2

)

2

- IIB)

SH

x

T

SH

(7) Solving for R1 from Equations 3 and 7:

V

x T

ref

R1 =

T

x I

SET

SH

- ( T

SH

- TSH) x I

SET

IB

(8)

where V

= 1.6 V

ref

I

= 0.1 µA

IB

R2 can now be calculated by substituting R1 into Equation 4:

Example: The temperature coefficient (TC) is calculated by Equations 1 and 2, resulting in:

R1 and R2 when set temperature is 80 °C (T

= 353 °K)

SET

and temperature hysteresis (TSH) is 5 °C.

R

TC =

2

R1 + R

(3) From Equation 3, R2 is calculated as follows:

T

R2 =

V

- R1 x I

ref

(4)

2

SET

V

- R1 x I

ref

x

x TC x R

- T

IB

SET

T

SET

1

x T

IB

R1 =

1.6 x 5

353 x1.25 µ - ( 353 - 5) x 0.1 µ

R1 = 19.68 k = 20 kΩ

R2 =

353 x 4 m x 19.68 k

1.6 -19.68 k x 0.1 µ - 353 x 4 m

C

R2 = 149.39 k = 150 kΩ

Page 6 January 1999 TOKO, Inc.

2. For Set Temperatures < 25 °C

V

x T

ref

R1 =

(T

SET

+ TSH) x I

SH

(9)

T

x TC x R

V

ref

SET

- R1 x I

SH

- T

R2 =

(10) Example:

APPLICATION HINTS (CONT.)

- T

x I

SET

IB

1

x T

SET

C

TK11051

R1 and R2 when set temperature is -25 °C (T

= 248 °K)

SET

and temperature hysteresis (TSH) is 5 °C.

R1 =

1.6 x 5

(248 + 5) x 1.25 µ - 248 x 0.1 µ

R1 = 27.45 k = 27 kΩ

R2 =

248 x 4 m x 27.45 k

1.6 - 27.45 k x 1.25 µ - 248 x 4 m

R2 = 47.47 k = 47 kΩ

PACKAGE POWER DISSIPATION (PD)

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.

January 1999 TOKO, Inc. Page 7

TK11051

PACKAGE OUTLINE

SOT-23L (SOT-23L-6)

456

123

e e

0.95 0.95

+0.3

- 0.1

3.5

(3.4)

0.1

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

0.32

+0.15

- 0.05

Marking

Marking Information

Marking TK11051 51C

0.6

1.0

3.0 e1

0.1

M

Recommended Mount Pad

0.3

1.2

1.4 max

+0.15

- 0.05

0 - 0.1

0.15

ee

0.95 0.95

2.2

+ 0.3

3.3

15 max

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

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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 8 January 1999 TOKO, Inc.

IC-xxx-TK11051

0798O0.0K