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| TK11052 THERMOSTAT IC FEATURES s Internal Temperature Sensor, Voltage Reference and Two Comparators with s Temperature Threshold and Hysteresis Set by Only Two External Resistors s Output Logic: Low to High with Increasing Temp. by OUTPUT1 High to Low with Increasing Temp. by OUTPUT2 s Very Wide Operating Supply Range (VCC = 2.7 to 6.0 V) s Miniature Package (SOT23L-8) 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 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. The TK11052 is available in a miniature SOT23L-8 surface mount package. TK11052 INPUT1 INPUT2 01S OUTPUT1 OUTPUT2 GND VCC VREF NC BLOCK DIAGRAM I IB1 ISINK1 COMP1 ORDERING INFORMATION I SH1 I IB2 + ISINK2 + COMP2 TEMPERATURE SENSOR TC = 6.1 mV/ C TK11052MTL Tape/Reel Code I SH2 TAPE/REEL CODE TL: Tape Left I OUT Vref = 1.597 V REFERENCE VOLTAGE 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 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 A, ROUT1 = 300 k, ROUT2 = 300 k, unless otherwise specified. SYMBOL ICC Vref IOUT Line Reg Load Reg PARAMETER Supply Current Reference Voltage Output Current (Vref) Line Regulation (Vref) Load Regulation (Vref) TEST CONDITIONS OUT1: CLH, OUT2: CLL (Pin 4) Load Reg < 12 mV (Pin 4) VCC = 3 V to 6 V (Pin 4) IOUT = 0 A to 500 A (Pin 4) TA = 25 C VTEMP Temperature Sensor (internal) TA = 85 C TA = 0 C TC TERR CLH CLL IIB1 ISH1 IIB2 ISH2 ISINK Temperature Coefficient (internal) Total Temperature Error Comparator Output High Level Comparator Output Low Level Input Bias Current 1 Hysteresis Set Current 1 Input Bias Current 2 Hysteresis Set Current 2 Output Sink Current TA = 0 C to 85 C TA = 0 C to 85 C (Note 1) (Note 2) ISINK 500 A (Note 2) OUT1: CLH OUT1: CLL OUT2: CLL OUT2: CLH CLL 0.3 V, (Pin 7, Pin 8) -50 0.9 -50 0.9 0 1.35 0 1.35 10 -4.0 2.8 0.3 50 1.8 50 1.8 500 -9 MIN TYP 280 1.597 80 0 3 645 1011 492.5 6.1 0 4.0 500 +9 12 MAX 350 UNITS A V A mV mV mV mV mV mV/ C C V V nA A A A A 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 = 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). Rb or Rd = Page 2 July 1999 TOKO, Inc. TK11052 TEST CIRCUIT C = 0.1 F b R b C = 0.1 F d R d R a V CC R V OUT1 OUTP OUT2 OUTP CC R R c V CC 1 F V ref Cref = 0.1 F 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 A, unless otherwise specified. REFERENCE VOLTAGE vs. TEMPERATURE 1.64 1.62 1.60 1.58 1.56 1.54 -25 0 25 50 75 100 VTEMP (V) Vref (V) TEMPERATURE SENSOR vs. TEMPERATURE 1.2 1.0 0.8 0.6 0.4 0.2 -25 0 25 50 75 100 TA (C) TOTAL TEMPERATURE ERROR vs. TEMPERATURE 2 1 TA (C) SUPPLY CURRENT vs. TEMPERATURE 300 290 OUTPUT1 = "H" OUTPUT2 = "L" TERR ( C) 0 -1 -2 -3 -25 0 25 50 75 100 ICC (A) 280 270 260 250 -25 0 25 50 75 100 TA (C) TA (C) HYSTERESIS SET CURRENT vs. TEMPERATURE 2.5 2.0 ISH (A) INPUT BIAS CURRENT vs. TEMPERATURE 5 4 IIB (nA) 1.5 1.0 0.5 0 -25 0 25 50 75 100 3 2 1 0 -25 0 25 50 75 100 TA (C) TA (C) Page 4 July 1999 TOKO, Inc. TK11052 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, VCC = 3 V, IOUT = 80 A, unless otherwise specified. LINE REGULATION 2 LINE REG (mV) SUPPLY CURRENT vs. SUPPLY VOLTAGE 340 320 ICC (V) OUTPUT1 = "H" OUTPUT2 = "L" 1 0 -1 -2 0 3 4 5 6 7 8 300 280 260 240 3 4 5 6 7 8 VCC (V) VCC (V) OUTPUT 1 vs. SUPPLY VOLTAGE 2.5 when CLH 2.5 OUTPUT1 (V) OUTPUT 1 vs. SUPPLY VOLTAGE when CLL OUTPUT1 (V) 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 VCC (V) 2.5 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 VCC (V) 2.0 2.5 OUTPUT 2 vs. SUPPLY VOLTAGE 2.5 when CLH 2.5 OUTPUT2 (V) OUTPUT 2 vs. SUPPLY VOLTAGE when CLL OUTPUT2 (V) 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 VCC (V) 2.5 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 VCC (V) 2.0 2.5 July 1999 TOKO, Inc. Page 5 TK11052 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, VCC = 3 V, IOUT = 80 A, unless otherwise specified. LOAD REGULATION 2 LOAD REG (mA) 1 0 -1 -2 -3 0 0.1 0.2 0.3 0.4 0.5 CLL (mV) COMPARATOR OUTPUT LOW LEVEL vs. OUTPUT SINK CURRENT 125 100 75 50 25 0 0 0.2 0.4 0.6 0.8 1.0 IOUT (mA) RIPPLE REJECTION (Vref) vs. FREQUENCY 100 80 RR (dB) Vref - GND Cref = 0 F ISINK (mA) RIPPLE REJECTION (Vref) vs. FREQUENCY 100 80 Vref - GND Cref= 0.1 F 60 40 20 0 10 100 1k 10k 100k 1M RR (dB) 60 40 20 0 10 100 1k 10k 100k 1M frr (Hz) REFERENCE VOLTAGE vs. SUPPLY VOLTAGE 2.0 1.6 frr (Hz) SUPPLY VOLTAGE RESPONSE 2.0 1.6 VREF (V) VCC = 0 V to 3 V VREF (V) 1.2 0.8 0.4 0 0 1 2 3 4 5 1.2 0.8 0.4 0 0 0.1 0.2 0.3 0.4 0.5 VCC (V) TIME (msec) Page 6 July 1999 TOKO, Inc. TK11052 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, VCC = 3 V, IOUT = 80 A, unless otherwise specified. OUTPUT 1 vs. TEMPERATURE 5 OUTPUT1 (V) OUTPUT 2 vs. TEMPERATURE 5 TSET = 50 C T SH = 5 C TSET = 50 C T SH = 5 C 3 2 1 0 35 40 45 50 55 60 OUTPUT2 (V) 4 4 3 2 1 0 35 40 45 50 55 60 TA (C) TA (C) TEMPERATURE RESPONSE A 5 TA = 25 C to 85 C T SET = 75 C OUTPUT1 (V) 5 4 3 2 1 0 0 5 10 15 20 25 TEMPERATURE RESPONSE B TA = 25 C to 85 C T SET = 80 C OUTPUT1 (V) 4 3 2 1 0 0 5 10 15 20 25 TIME (sec) TIME (sec) TEMPERATURE RESPONSE C 5 OUTPUT1 (V) 4 3 2 1 0 0 5 10 15 20 25 TA = 25 C to -30 C T SET = -20 C OUTPUT1 (V) 5 4 3 2 1 0 TEMPERATURE RESPONSE D TA = 25 C to -30 C T SET = -25 C 0 5 10 15 20 25 TIME (sec) TIME (sec) July 1999 TOKO, Inc. Page 7 TK11052 APPLICATION HINTS EXTERNAL RESISTORS Ra , Rb , Rc , and Rd 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. TSET TSH (6) 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 1183 x TSH 80.74 + TSET x 103 FIGURE 1 The set voltage (VSET) of the comparator at the set temperature (TSET) is calculated as follows: (1) VSET = 0.4925 + TSET x TC where ISH = 1.35 A, TC = 6.1 mV and VREF = 1.597 V Rb is calculated by Equations (3) and (6) (7) Rb = Vref x TSH x TC (VREF - 0.4925 - TSET x TC) x ISH 1.597 x TSH x 6.1 m (1.597 - 0.4925 - TSET x 6.1 m) x 1.35 1183 x TSH 181.07 - TSET x 103 where TC = 6.1 mV/C 1. For Set Temperatures 25 C The set voltage (VSET) of the comparator at the reference voltage and external resistances is calculated as follows: (2) VSET = Rb Ra + Rb x VREF Example: = 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 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 The hysteresis voltage (VSH) of the comparator can be calculated as follows: (4) VSH = = 35.69 k 36 k 1183 x TSH 181.07 - TSET 1183 x 5 x 103 181.07 - 85 (R +R a Ra x Rb b )x I SH Rb = x 103 = where ISH = 1.35 A Rb is calculated by Equation (4) Ra x VSH Rb = (5) Ra x ISH - VSH Ra is calculated by Equations (3) and (5) = 61.57 k 62 k 2. For Set Temperatures < 25 C VREF x TSH x TC (8) Ra = (0.4925 + TSET x TC - TSH x TC) x ISH = 1183 x TSH 80.74 + (TSET - TSH) x 103 Page 8 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 = 1183 x TSH 80.74 + (TSET - TSH) 1183 x TSH 181.07 - (TSET - TSH) x 103 = 78.096 x 103 78.1 k Rb = x 103 = 31.789 x 103 31.8 k 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 IN1 OUT1 300 k OUT2 GND Protected Circuit OUT1 + OUT2 "L" OUT2 "L" "H" "L" OUT1 "H" "L" "H" TK11052M 62 k 36 k 31.8 k 78.1 k VCC IN2 VCC Vref NC 0 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 IN1 62 k IN2 VCC VCC 0.1 F 32 k Vref OUT1 VCC VCC "L" TK11052M 300 k OUT2 OUT2 GND Protected Circuit "L" "H" NC 0 10 80 90 Temperature (C) 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 OUTPUT2 HYSTERESIS AREA TSET - TSH TA TSET TSET - TSH TA TSET Temperature (C) Temperature (C) Pin1 to GND Pin 2 to GND Pin 1 to Pin 4 Pin 2 to Pin 4 See following OUTPUT1: Low Level OUTPUT2: High Level OUTPUT1: High Level OUTPUT 2: Low Level VCC "L" Rb Ra VCC "H" Ra VCC "H" Rb VCC "L" Rd Rc Rd Rc VCC Page 10 VCC 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 F 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 C = 0.1 F b R b C = 0.1 F d R d CC R OUT1 OUTPUT1 OUT2 OUTPUT2 R a V CC R R c V CC 1 F V ref Cref = 0.1 F July 1999 TOKO, Inc. Page 11 TK11052 PACKAGE OUTLINE Marking Information Marking 52C SOT-23L (SOT23L-8) TK11052 0.45 8 5 marking 1.0 e 0.8 1 e 0.8 4 +0.15 - 0.05 Recommended Mount Pad 0.1 M 0.3 +0.3 3.5 - 0.1 (3.4) 2.2 1.4max 1.2 0.3 e1 3.0 0 - 0.1 +0.15 - 0.05 0.4 + 0.3 0.15 0.1 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 (c) 1999 Toko, Inc. All Rights Reserved IC-xxx-TK11052 0798O0.0K 15 max July 1999 TOKO, Inc. Printed in the USA |
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