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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TMP01FS Fiches technique(PDF) 12 Page - Analog Devices |
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TMP01FS Fiches technique(HTML) 12 Page - Analog Devices |
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12 / 20 page  TMP01 Rev. E | Page 12 of 20 Thus, the output taken from the collector of Q2 is identical to the output of the TMP01. By picking a transistor that can accommodate large amounts of current, many high power devices can be switched. The last class of high power devices discussed here are thyristors, which includes SCRs and Triacs. Triacs are a useful alternative to relays for switching ac line voltages. The 2N6073A shown in Figure 21 is rated to handle 4A (rms). The opto- isolated MOC3011 Triac features excellent electrical isolation from the noisy ac line and complete control over the high power Triac with only a few additional components. TEMPERATURE SENSOR AND VOLTAGE REFERENCE VREF VPTAT 1 2 3 4 8 7 6 5 HYSTERESIS GENERATOR WINDOW COMPARATOR Q1 TMP01 R1 R2 R3 V+ 4.7k Ω 2N1711 IC TEMPERATURE SENSOR AND VOLTAGE REFERENCE VREF VPTAT 1 2 3 4 8 7 6 5 HYSTERESIS GENERATOR LOAD AC WINDOW COMPARATOR NC = NO CONNECT TMP01 R1 R2 R3 NC NC V+ = 5V 300 Ω 6 5 4 1 2 3 150 Ω 2N6073A MOC9011 Figure 22. An External Resistor Minimizes Self-Heating TEMPERATURE SENSOR AND VOLTAGE REFERENCE VREF VPTAT 1 2 3 4 8 7 6 5 HYSTERESIS GENERATOR WINDOW COMPARATOR Q1 TMP01 R1 R2 R3 V+ 4.7k Ω 2N1711 Q2 2N1711 IC 4.7k Ω Figure 21. Controlling the 2N6073A Triac HIGH CURRENT SWITCHING Internal dissipation due to large loads on the TMP01 outputs causes some temperature error due to self-heating. External transistors remove the load from the TMP01, so that virtually no power is dissipated in the internal transistors and no self- heating occurs. Figure 22 through Figure 24 show a few examples using external transistors. The simplest case, using a single transistor on the output to invert the output signal is shown in Figure 22. When the open collector of the TMP01 turns on and pulls the output down, the external transistor Q1 base is pulled low, turning off the transistor. Another transistor can be added to reinvert the signal as shown in Figure 23. Now, when the output of the TMP01 is pulled down, the first transis- tor, Q1, turns off and its collector goes high, which turns Q2 on, pulling its collector low. Figure 23. Second Transistor Maintains Polarity of TMP01 Output An example of a higher power transistor is a standard Darlington configuration as shown in Figure 24. The part chosen, TIP-110, can handle 2 A continuous which is more than enough to control many high power relays. In fact, the Darlington itself can be used as the switch, similar to MOSFETs and IGBTs. TEMPERATURE SENSOR AND VOLTAGE REFERENCE VREF VPTAT 1 2 3 4 8 7 6 5 HYSTERESIS GENERATOR WINDOW COMPARATOR TMP01 R1 R2 R3 V+ 4.7k Ω 2N1711 RELAY 12V TIP-110 IC 4.7k Ω MOTOR SWITCH Figure 24. Darlington Transistor Can Handle Large Currents |
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