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TMP63 Scheda tecnica(PDF) 15 Page - Texas Instruments |
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TMP63 Scheda tecnica(HTML) 15 Page - Texas Instruments |
15 / 28 page Temperature (qC) 0 25 50 75 100 125 150 0 1 2 3 4 5 6 D014 OUT TEMP R EF V G V 1 G V u u FB 1 R G R TMP63 TEMP BIAS BIAS TMP63 R V V R R § · u ¨ ¸ © ¹ RBias 200 k 5 V RTMP63 R2 200 k VOut R1 10 k R3 200 k VTemp RFB 300 k VRef 15 TMP63 www.ti.com SNIS211C – OCTOBER 2019 – REVISED JUNE 2020 Product Folder Links: TMP63 Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated Typical Application (continued) Figure 19. Thermal Foldback Using Voltage Divider and a Rail-to-Rail Op Amp The op amp remains high as long as the voltage output is below VREF. When the temperature goes above 110°C, the output falls to the 0-V rail of the op amp. The rate at which the foldback occurs depends on the feedback network, RFB and R1, which varies the gain of the op amp, G, as shown in Equation 6. The foldback behavior controls the voltage and temperature sensitivity of the circuit. The device feeds this voltage output into a LED driver circuit that adjusts output current accordingly. VOUT is the final output voltage used for thermal foldback and is calculated in Equation 7. Figure 20 describes the output voltage curve in this example which sets the knee point at 110°C. (5) (6) (7) Figure 20. Thermal Foldback Voltage Output Curve |
Codice articolo simile - TMP63_V03 |
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Descrizione simile - TMP63_V03 |
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