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| TK11050 TEMPERATURE CONTROLLER IC FEATURES s Internal Temperature Sensor, Voltage Reference and Comparator s Temperature Threshold and Hysteresis Set by Only Two External Resistors s Output Logic: Low to High 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 APPLICATIONS s s s s s s s 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 The TK11050 is an accurate temperature controller IC for use over the -30 to +105 C temperature range. The TK11050 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 TK11050 is available in a miniature SOT-23L-6 surface mount package. BLOCK DIAGRAM TK11050 VCC VCONT VREF COMP OUT 01 S GND COMP IN ORDERING INFORMATION VCONT ON/OFF CIRCUIT VCC VPTAT TEMPERATURE SENSOR TK11050MTL Tape/Reel Code VREF VOLTAGE REFERENCE COMP OUT COMP IN + GND TAPE/REEL CODE TL: Tape Left January 1999 TOKO, Inc. Page 1 TK11050 ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................... 10 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: TA = 25 C, VCC = 3.0 V, VCONT = 2.4 V, IOUT = 40 A, R3 = 100 k, unless otherwise specified. SYMBOL ICC ISTBY PARAMETER Quiescent Current Comparator Output HIGH Standby Current Temperature Sensor Voltage (Note 4) Temperature Coefficient Temperature Error Comparator Output HIGH Comparator Output LOW Input Bias Current Hysteresis Set Current Output Sink Current VCONT 0.6 V T A = 25 C VPTAT T A = 85 C TA = -30 C TC TERR CLH CLL IIB ISH IOUT TA = 0 to 85 C TA = 0 to 85 C, (Note 2) (Note 3) R3 10 k, (Note 3) Comparator IN > VPTAT Comparator IN < VPTAT CLL 0.3 V 0.9 0.1 1.25 30 -4.0 2.8 0.3 0.3 1.6 300 1.192 1.432 0.972 4.0 0 4. 0 210 350 1 A A V V V mV/ C C V V A A A TEST CONDITIONS Comparator Output LOW MIN TYP 250 MAX 350 UNITS A Vref TERMINAL CHARACTERISTICS Vref Iref Line Reg Load Reg Reference Voltage Reference Output Current Line Regulation Load Regulation TA = 25 C R1 + R2 = 40 k VCC = 3 to 6 V IOUT = 0 to 500 A 1.6 40 2 1 500 8 8 V A mV mV CONTROL TERMINAL SPECIFICATIONS ICONT VCONT(ON) VCONT(OFF) Control Current Control Voltage (ON) Control Voltage (OFF) Output ON Output OFF 1 1.8 GND 3.5 6 VCC 0.6 A 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 = Vref x TSH / (TSET x ISH - (TSET -TSH) x IIB), R2 = TSET x TC x R1 / (Vref R1 x IIB - TSET x TC). IIB is 0.1 A and ISH is 1.25 A. Note 3: When VPTAT < COMP IN, COMP OUT < 0.3 V (Low Level). When VPTAT > COMP IN, COMP OUT > 2.8 V (High Level). Note 4: VPTAT does not have an output pin. Page 2 January 1999 TOKO, Inc. TK11050 TEST CIRCUIT ICONT VCONT ON/OFF CIRCUIT Vref VOLTAGE REFERENCE R1 ISINK COMP IN + IIB R2 ISH R1 + R2 = 40 k GND VPTAT TEMPERATURE SENSOR VCC ICC COMP OUT R3 100 k 10 F TA = 25 C, VCC = 3 V, VCONT = 2.4 V, IOUT = 40 A, unless otherwise specified. REFERENCE VOLTAGE vs. TEMPERATURE 1.62 1.61 VPTAT (V) Vref (V) TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE VOLTAGE vs. TEMPERATURE 1.6 1.4 1.2 1.0 0.8 Vref (V) 1.62 1.61 1.60 1.59 1.58 LINE REGULATION 1.60 1.59 1.58 -40 0 40 TA (C) 80 120 -40 0 40 TA (C) 80 120 2 4 6 VCC (V) 8 10 LOAD REGULATION 1.62 1.61 ICONT A) CONTROL CURRENT vs. TEMPERATURE 4 3 ICONT A) CONTROL CURRENT vs. CONTROL VOLTAGE 4 3 Vref (V) 1.60 1.59 1.58 0 0.2 0.4 Iref (mA) 0.6 0.8 2 1 2 1 0 -40 0 40 TA (C) 80 120 0 0 0.6 1.2 VCONT (V) 1.8 2.4 January 1999 TOKO, Inc. Page 3 TK11050 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, VCC = 3 V, VCONT = 2.4 V, IOUT = 40 A, unless otherwise specified. CONTROL VOLTAGE RESPONSE A 2.0 1.5 Vref (V) 1.0 0.5 0 0 2 4 TIME (ms) 6 8 VCONT = 0 TO 2.4 V 2.0 1.5 1.0 0.5 0 CONTROL VOLTAGE RESPONSE B VCONT = 0 TO 2.4 V 80 60 RR (dB) 40 20 0 0 2 4 TIME (ms) 6 8 RIPPLE REJECTION RATIO A (Vref) VRR = 100 mVrms Vref (V) COUT = 0.1 F COUT = 0 F COUT = 0.1 F 10 100 1k f (Hz) 10 k 100 k RIPPLE REJECTION RATIO B (Vref) 80 60 RR (dB) VRR = 100 mVrms INPUT BIAS CURRENT vs. TEMPERATURE 120 COMP IN > VPTAT 100 ISH (A) HYSTERESIS SET CURRENT vs. TEMPERATURE 1.4 COMP IN < VPTAT 1.3 IB (nA) 40 20 0 10 100 COUT = 0 F 80 60 1.2 1.1 40 1k f (Hz) 10 k 100 k 1.0 -40 0 40 TA (C) SUPPLY CURRENT vs. SUPPLY VOLTAGE 80 120 -40 0 40 TA (C) REFERENCE VOLTAGE vs. CONTROL VOLTAGE 1.6 1.2 R1 + R2 = 40 k R3 = 100 k Vref (V) 80 120 SUPPLY CURRENT vs. TEMPERATURE 260 240 COMP OUT = LOW LEVEL 350 300 R1 + R2 = 40 k R3 = 100 k COMP OUT = LOW LEVEL ICC (A) 220 ICC (A) 250 0.8 200 180 -40 COMP OUT = HIGH LEVEL 0 40 TA (C) 80 120 200 COMP OUT = HIGH LEVEL 150 2 3 4 VCC (V) 5 6 0.4 0 0 0.6 1.2 1.8 2.4 VCONT (V) Page 4 January 1999 TOKO, Inc. TK11050 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, VCC = 3 V, VCONT = 2.4 V, IOUT = 40 A, unless otherwise specified. COMPARATOR OUTPUT (LOW LEVEL) vs. OUTPUT SINK CURRENT 160 120 CLL (mV) COMP OUT (V) SUPPLY CURRENT vs. CONTROL VOLTAGE 320 240 ICC (A) COMPARATOR OUTPUT vs. TEMPERATURE 4 3 2 TSET = 80 C TSH = 5 C 160 80 80 0 0 0.6 1.2 1.8 2.4 40 0 0 0.2 0.4 IOUT (mA) 0.6 0.8 1 0 65 70 75 TA (C) 80 85 VCONT (V) CONTROL VOLTAGE RESPONSE 4 COMP OUT (V) COMPARATOR INPUT RESPONSE 4 COMP OUT (V) TEMPERATURE RESPONSE A 4 COMP OUT (V) VCONT = 0 TO 2.4 V COMP IN = 1.6 TO 0.8 V TA = 25 TO 85 C TSET = 75 C 3 2 3 2 3 2 1 0 0 2 4 TIME (ms) 6 8 1 0 0 0.2 0.4 TIME (ms) 0.6 0.8 1 0 0 5 10 TIME (s) 15 20 TEMPERATURE RESPONSE B 4 COMP OUT (V) TEMPERATURE RESPONSE C 4 COMP OUT (V) TEMPERATURE RESPONSE D 4 COMP OUT (V) TA = 25 TO 85 C TSET = 80 C TA = 25 TO -30 C TSET = -20 C TA = 25 TO -30 C TSET = -25 C 3 2 3 2 3 2 1 0 0 5 10 TIME (s) 15 20 1 0 0 5 10 TIME (s) 15 20 1 0 0 5 10 TIME (s) 15 20 January 1999 TOKO, Inc. Page 5 TK11050 APPLICATION HINTS EXTERNAL RESISTORS R1 AND R2 The temperature set point (TSET) and hysteresis (TSH) of the TK11050 are easily set by two external resistors R1 and R2. See Figure 1 for clarification of TSET and TSH. The hysteresis voltage (VSH) of the comparator can be calculated as follows: DRRDRDROP VSH = (5) ( R + R ) X (I 1 2 R1 x R2 SH - IIB) TSH TSET where ISH = 1.25 A The hysteresis represented as temperature is: FIGURE 1 The set voltage (VSET) of the comparator at the set temperature (TSET) is calculated as follows: VSET = TSET x TC (1) where TSET is an absolute temperature (K). That is, TSET (K) = C + 273 and TC = 4 mV/C. 1. For Set Temperatures 25 C R2 x Vref R1 + R2 R2 R1 x R2 x IIB = x (Vref - R1 x IIB) R1 + R2 R1 + R2 (8) R2 can now be calculated by substituting R1 into Equation 4: TSH = (6) ( R + R )x 1 2 R1 x R2 (ISH - IIB) TC Solving for temperature coefficient (TC): TC = (7) Solving for R1 from Equations 3 and 7: (R + R )x 1 2 R 1 x R2 (ISH - IIB) TSH VSET = (2) R1 = Vref x TSH TSET x ISH - ( TSET - TSH) x IIB where Vref = 1.6 V IIB = 0.1 A The temperature coefficient (TC) is calculated by Equations 1 and 2, resulting in: R2 Vref - R1 x IIB x R1 + R2 TSET Example: R1 and R2 when set temperature is 80 C (TSET = 353 K) and temperature hysteresis (TSH) is 5 C. TC = (3) R1 = 1.6 x 5 353 x1.25 - ( 353 - 5) x 0.1 From Equation 3, R2 is calculated as follows: TSET x TC x R1 Vref - R1 x IIB - TSET x TC R1 = 19.68 k = 20 k R2 = 353 x 4 m x 19.68 k 1.6 -19.68 k x 0.1 - 353 x 4 m R2 = (4) Page 6 R2 = 149.39 k = 150 k January 1999 TOKO, Inc. TK11050 APPLICATION HINTS (CONT.) 2. For Set Temperatures < 25 C Vref x TSH (TSET + TSH) x ISH - TSET x IIB R1 = (9) R2 = (10) Example: TSET x TC x R1 Vref - R1 x ISH - TSET x TC R1 and R2 when set temperature is -25 C (TSET = 248 K) and temperature hysteresis (TSH) is 5 C. R1 = 1.6 x 5 (248 + 5) x 1.25 - 248 x 0.1 R1 = 27.45 k = 27 k R2 = 248 x 4 m x 27.45 k 1.6 - 27.45 k x 1.25 - 248 x 4 m R 2 = 47.47 k = 47 k 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 TK11050 PACKAGE OUTLINE Marking Information Marking 50C SOT-23L (SOT-23L-6) TK11050 0.6 6 5 4 Marking 1.0 1 e 2 e 0.95 3 0.32 0.95 +0.15 - 0.05 0.1 M e 0.95 e 0.95 Recommended Mount Pad 3.5 +0.3 - 0.1 2.2 0.3 (3.4) 1.4 max e1 3.0 1.2 +0.15 - 0.05 15 0 - 0.1 0.4 + 0.3 0.1 0.15 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 8 (c) 1999 Toko, Inc. All Rights Reserved IC-xxx-TK11050 0798O0.0K max January 1999 TOKO, Inc. Printed in the USA |
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