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TL431LI Fiches technique(PDF) 16 Page - Texas Instruments |
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TL431LI Fiches technique(HTML) 16 Page - Texas Instruments |
16 / 32 page TL43xLIx RS 0.1% IO VI(BATT) I O V ref R S = Copyright © 2017, Texas Instruments Incorporated Time (s) -0.001 -0.0006 -0.0002 0.0002 0.0006 0.001 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 D001 Vin Vka(Rsup=10k:) Vka(Rsup=1k:) 16 TL431LI TL432LI SLVSDQ6 – JULY 2018 www.ti.com Product Folder Links: TL431LI TL432LI Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 10.2.1.2.2 Output Voltage and Logic Input Level In order for TL43xLI to properly be used as a comparator, the logic output must be readable by the receiving logic device. This is accomplished by knowing the input high and low level threshold voltage levels, typically denoted by VIH and VIL. As seen in Figure 21, TL43xLI's output low level voltage in open-loop/comparator mode is approximately 2 V, which is typically sufficient for 5 V supplied logic. However, would not work for 3.3 V and 1.8 V supplied logic. To accommodate this a resistive divider can be tied to the output to attenuate the output voltage to a voltage legible to the receiving low voltage logic device. TL43xLI's output high voltage is equal to VSUP due to TL43xLI being open-collector. If VSUP is much higher than the receiving logic's maximum input voltage tolerance, the output must be attenuated to accomadate the outgoing logic's reliability. When using a resistive divider on the output, be sure to make the sum of the resistive divider (R1 and R2 in Figure 20) is much greater than RSUP in order to not interfere with TL43xLI's ability to pull close to VSUP when turning off. 10.2.1.2.2.1 Input Resistance TL43xLI requires an input resistance in this application in order to source the reference current (IREF) needed from this device to be in the proper operating regions while turning on. The actual voltage seen at the ref pin will be VREF=VIN-IREFRIN. Because IREF can be as high as 0.8 µA it is recommended to use a resistance small enough that will mitigate the error that IREF creates from VIN. 10.2.1.3 Application Curve Figure 21. Output Response With Various Cathode Currents 10.2.2 Precision Constant Current Sink Figure 22. Precision Constant Current Sink Application Schematic |
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