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ADT14GS Datasheet(PDF) 10 Page - Analog Devices |
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ADT14GS Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page ADT14 –10– REV. 0 TEMP SENSOR & VOLTAGE REFERENCE HYSTERESIS GENERATOR 13 14 15 9 10 11 12 16 6 7 8 1 2 3 4 5 NC NC VREF V+ 4.7k Ω IL Q1 NC = NO CONNECT ADT14 Figure 19a. An External Resistor Minimizes Self-Heating High Current Switching As mentioned earlier, internal dissipation due to large loads on the ADT14 outputs will cause some temperature error due to self-heating. External transistors buffer the load from the ADT14, so that virtually no power is dissipated in the internal transistors and minimal self-heating occurs. Figures 19a–19c show a few examples using external transistors. The simplest case uses a single transistor on the output to invert the output signal as shown in Figure 19a. When the open-collector of the ADT14 turns ON and pulls the output down, the external transistor Q1’s base will be pulled low, turning off the transistor. Another transis- tor can be added to reinvert the signal as shown in Figure 19b. Now, when the output of the ADT14 is pulled down, the first transistor, Q1, turns off and its collector goes high, which turns on Q2, pulling its collector low. Thus, the output taken from the collector of Q2 is identical to the output of the ADT14. By pick- ing a transistor that can accommodate large amounts of current, many high power devices can be switched. An example of a higher power transistor is a standard Darlington configuration as shown in Figure 19c. 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. TEMP SENSOR & VOLTAGE REFERENCE HYSTERESIS GENERATOR 13 14 15 9 10 11 12 16 6 7 8 1 2 3 4 5 NC NC VREF V+ 4.7k Ω IL Q2 2N1711 4.7k Ω Q1 2N1711 NC = NO CONNECT ADT14 Figure 19b. Second Transistor Maintains Polarity of ADT14 Output TEMP SENSOR & VOLTAGE REFERENCE HYSTERESIS GENERATOR 13 14 15 9 10 11 12 16 6 7 8 1 2 3 4 5 NC NC VREF V+ 4.7k Ω IL 2N1711 4.7k Ω TIP110 RELAY +12V NC = NO CONNECT ADT14 Figure 19c. Darlington Transistor Can Handle Large Currents |
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