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LM20SITLX Folha de dados(PDF) 8 Page - Texas Instruments |
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LM20SITLX Folha de dados(HTML) 8 Page - Texas Instruments |
8 / 18 page LM20 SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013 www.ti.com Table 3. Temperature Rise of LM20 Due to Self-Heating and Thermal Resistance ( θJA) (1) SC70-5 SC70-5 No Heat Sink Small Heat Sink θJA TJ − TA θJA TJ − TA (°C/W) (°C) (°C/W) (°C) Still air 412 0.2 350 0.19 Moving air 312 0.17 266 0.15 (1) See PCB Layouts Used For Thermal Measurements for PCB layout samples. DSBGA DSBGA No Heat Sink Small Heat Sink θJA TJ − TA θJA TJ − TA (°C/W) (°C) (°C/W) (°C) Still air 340 0.18 TBD TBD Moving air TBD TBD TBD TBD Capacitive Loads The LM20 handles capacitive loading well. Without any precautions, the LM20 can drive any capacitive load less than 300 pF as shown in Figure 6. 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 recommended that 0.1 μF be added from V+ to GND to bypass the power supply voltage, as shown in Figure 7. In a noisy environment it may even be necessary to add a capacitor from the output to ground with a series resistor as shown in Figure 7. 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. Figure 6. 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 8 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM20 |
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