поискавой системы для электроныых деталей |
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LM45B датащи(PDF) 4 Page - National Semiconductor (TI) |
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LM45B датащи(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Applications The LM45 can be applied easily in the same way as other integrated-circuit temperature sensors It can be glued or cemented to a surface and its temperature will be within about 02 C of the surface temperature This presumes that the ambient air temperature is almost the same as the surface temperature if the air temperature were much higher or lower than the surface temperature the actual temperature of the LM45 die would be at an inter- mediate temperature between the surface temperature and the air temperature To ensure good thermal conductivity the backside of the LM45 die is directly attached to the GND pin The lands and traces to the LM45 will of course be part of the printed circuit board which is the object whose temperature is be- ing measured These printed circuit board lands and traces will not cause the LM45s temperature to deviate from the desired temperature Alternatively the LM45 can be mounted inside a sealed-end metal tube and can then be dipped into a bath or screwed into a threaded hole in a tank As with any IC the LM45 and accompanying wiring and circuits must be kept insulated and dry to avoid leakage and corrosion This is especially true if the circuit may operate at cold temperatures where condensation can occur Printed-circuit coatings and var- nishes such as Humiseal and epoxy paints or dips are often used to insure that moisture cannot corrode the LM45 or its connections Temperature Rise of LM45 Due to Self-Heating (Thermal Resistance) SOT-23 SOT-23 no heat sink small heat fin Still air 450 CW 260 CW Moving air 180 CW Heat sink used is square printed circuit board with 2 oz foil with part attached as shown in Figure 3 Part soldered to 30 gauge wire Typical Applications CAPACITIVE LOADS Like most micropower circuits the LM45 has a limited ability to drive heavy capacitive loads The LM45 by itself is able to drive 500 pF without special precautions If heavier loads are anticipated it is easy to isolate or decouple the load with a resistor see Figure 4 Or you can improve the tolerance of capacitance with a series R-C damper from output to ground see Figure 5 Any linear circuit connected to wires in a hostile environ- ment can have its performance affected adversely by in- tense electromagnetic sources such as relays radio trans- mitters motors with arcing brushes SCR transients etc as its wiring can act as a receiving antenna and its internal junctions can act as rectifiers For best results in such cas- es a bypass capacitor from VIN to ground and a series R-C damper such as 75X in series with 02 or 1 mF from output to ground as shown in Figure 5 are often useful TLH11754 – 8 FIGURE 4 LM45 with Decoupling from Capacitive Load TLH11754 – 9 FIGURE 5 LM45 with R-C Damper TLH11754 – 12 FIGURE 6 Temperature Sensor Single Supply b20 Cto a100 C 4 |
Аналогичный номер детали - LM45B |
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Аналогичное описание - LM45B |
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