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