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TMP01 Arkusz danych(PDF) 11 Page - Analog Devices |
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TMP01 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page TMP01 REV. C –11– The last class of high power devices discussed here are Thyris- tors, which includes SCRs and Triacs. Triacs are a useful alter- native to relays for switching ac line voltages. The 2N6073A shown in Figure 15e is rated to handle 4A (rms). The optoisolated MOC3011. Triac shown features excellent electri- cal isolation from the noisy ac line and complete control over the high power Triac with only a few additional components. NC = NO CONNECT NC NC V+ = 5V R1 R2 R3 300 Ω 150 Ω TEMPERATURE SENSOR & VOLTAGE REFERENCE 1 2 3 4 HYSTERESIS GENERATOR WINDOW COMPARATOR TMP01 VPTAT VREF 7 8 5 6 MOC3011 1 2 34 5 6 LOAD AC 2N6073A Figure 15e. Controlling the 2N6073A Triac High Current Switching As mentioned above, internal dissipation due to large loads on the TMP01 outputs will cause 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 16 shows a few ex- amples using external transistors. The simplest case, using a single transistor on the output to invert the output signal is shown in Figure 16a. When the open-collector of the TMP01 turns “ON” and pulls the output down, the external transistor Q1’s base will be pulled low, turning off the transistor. Another transistor can be added to reinvert the signal as shown in Figure 16b. Now, when the output of the TMP01 is pulled down, the first transistor, Q1, turns off and its collector goes high, which turns Q2 on, pulling its collector low. 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. 2N1711 V+ R1 R2 R3 4.7k Ω TEMPERATURE SENSOR & VOLTAGE REFERENCE 1 2 3 4 HYSTERESIS GENERATOR WINDOW COMPARATOR TMP01 VPTAT VREF 7 8 5 6 I C Q1 Figure 16a. An External Resistor Minimizes Self-Heating Q1 Q2 2N1711 V+ R1 R2 R3 4.7k Ω TEMPERATURE SENSOR & VOLTAGE REFERENCE 1 2 3 4 HYSTERESIS GENERATOR WINDOW COMPARATOR TMP01 VPTAT VREF 7 8 5 6 I C 4.7k Ω 2N1711 Figure 16b. Second Transistor Maintains Polarity of TMP01 Output An example of a higher power transistor is a standard Darling- ton configuration as shown in Figure 16c. The part chosen, TIP-110, can handle 2A 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. MOTOR SWITCH RELAY +12V 2N1711 V+ R1 R2 R3 4.7k Ω TEMPERATURE SENSOR & VOLTAGE REFERENCE 1 2 3 4 HYSTERESIS GENERATOR WINDOW COMPARATOR TMP01 VPTAT VREF 7 8 5 6 I C 4.7k Ω TIP-110 Figure 16c. Darlington Transistor Can Handle Large Currents |
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