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LM20SIBP Fiches technique(PDF) 6 Page - National Semiconductor (TI) |
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LM20SIBP Fiches technique(HTML) 6 Page - National Semiconductor (TI) |
6 / 9 page 2.0 Mounting (Continued) 3.0 Capacitive Loads The LM20 handles capacitive loading well. Without any pre- cautions, the LM20 can drive any capacitive load less than 300 pF as shown in Figure 4. Over the specified temperature range the LM20 has a maximum output impedance of 160 Ω. In an extremely noisy environment it may be necessary to add some filtering to minimize noise pickup. It is recom- mended that 0.1 µF be added from V + to GND to bypass the power supply voltage, as shown in Figure 5. In a noisy envi- ronment it may even be necessary to add a capacitor from the output to ground with a series resistor as shown in Figure 5. A 1 µF output capacitor with the 160 Ω maximum output impedance and a 200 Ω series resistor will form a 442 Hz lowpass filter. Since the thermal time constant of the LM20 is much slower, the overall response time of the LM20 will not be significantly affected. 4.0 LM20 micro SMD Light Sensitivity Exposing the LM20 micro SMD package to bright sunlight may cause the output reading of the LM20 to drop by 1.5V. In a normal office environment of fluorescent lighting the output voltage is minimally affected (less than a millivolt drop). In ei- ther case it is recommended that the LM20 micro SMD be placed inside an enclosure of some type that minimizes its light exposure. Most chassis provide more than ample pro- tection. The LM20 does not sustain permanent damage from light exposure. Removing the light source will cause LM20’s output voltage to recover to the proper value. SC70-5 SC70-5 no heat sink small heat sink θ JA T J −TA θ JA T J −TA (˚C/W) (˚C) (˚C/W) (˚C) Still air 412 0.2 350 0.19 Moving air 312 0.17 266 0.15 See Figure 1 for PCB layout samples. micro SMD micro SMD no heat sink small heat fin θ JA T J −TA θ JA T J −TA (˚C/W) (˚C) (˚C/W) (˚C) Still air TBD TBD TBD TBD Moving air TBD TBD TBD TBD FIGURE 3. Temperature Rise of LM20 Due to Self-Heating and Thermal Resistance ( θ JA) DS100908-15 FIGURE 4. LM20 No Decoupling Required for Capacitive Loads Less than 300 pF. R( Ω) C (µF) 200 1 470 0.1 680 0.01 1 k 0.001 DS100908-16 DS100908-33 FIGURE 5. LM20 with Filter for Noisy Environment and Capacitive Loading greater than 300 pF. Either placement of resistor as shown above is just as effective. www.national.com 6 |
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Description similaire - LM20SIBP |
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