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LM20 bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM20 bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 18 page R1 4.1V R3 R2 0.1 PF U3 LM4040 R4 VOUT V+ VT VTemp + - U1 LM20 V+ U2 (High = overtemp alarm) VT1 VT2 VTEMP VOUT VT1 = R1 + R2||R3 (4.1)R2 VT2 = R2 + R1||R3 (4.1)R2||R3 LM7211 LM20 www.ti.com SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013 Figure 7. LM20 with Filter for Noisy Environment and Capacitive Loading Greater Than 300 pF NOTE Either placement of resistor as shown above is just as effective. LM20 DSBGA Light Sensitivity Exposing the LM20 DSBGA 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 either case it is recommended that the LM20 DSBGA be placed inside an enclosure of some type that minimizes its light exposure. Most chassis provide more than ample protection. 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. APPLICATION CIRCUITS Figure 8. Centigrade Thermostat Figure 9. Conserving Power Dissipation with Shutdown Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM20 |
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