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LM1946M Folha de dados(PDF) 7 Page - National Semiconductor (TI) |
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LM1946M Folha de dados(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page Application Hints (Continued) One solution is to use a low cost thermistor in conjunction with some low-TC resistors (see Figure 8 ) There are three fixed resistors and one thermistor This is an NTC thermistor since it has a negative temperature co- efficient This is what is required in order to have Iset in- crease as the temperature rises The data sheet with the thermistor described a number of ways to establish different final TC’s The thermistor itself has a very large TC which is somewhat difficult to describe mathematically But if it is used with some other fixed resistors such as Rmin and Rmax definite end point limits can be established and an approximate staight line TC generated See Figure 9 for a graphic representation of the ideal calculated values of Iset and the actual measured values generated Notice that there is very close agreement between the two graphs The circuit actually creates an S-shaped curve around the ideal The low-cost thermistor is available from Keystone and is listed as follows RL2008-523K-155-D1 OVER-CURRENT LIMIT DETECTOR Other applications include an over-current detector as shown in Figure 10 The load represented here can be ei- ther a single component or an entire system Resistors R3 TLH8707 – 11 Thermistor Keystone RL2008-523K-155-D1 100k 25 C FIGURE 8 ThermistorResistor Network TLH8707 – 12 FIGURE 9 Iset vs Temperature with Figure 8 Circuit 7 |
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Descrição semelhante - LM1946M |
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