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TL431LI Fiches technique(PDF) 15 Page - Texas Instruments |
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TL431LI Fiches technique(HTML) 15 Page - Texas Instruments |
15 / 32 page 15 TL431LI TL432LI www.ti.com SLVSDQ6 – JULY 2018 Product Folder Links: TL431LI TL432LI Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Typical Applications (continued) 10.2.1.1 Design Requirements For this design example, use the parameters listed in Table 1 as the input parameters. Table 1. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input Voltage Range 0 V to 5 V Input Resistance 10 kΩ Supply Voltage 24 V Cathode Current (Ik) 5 mA Output Voltage Level ~2 V – VSUP Logic Input Thresholds VIH/VIL VL 10.2.1.2 Detailed Design Procedure When using TL43xLI as a comparator with reference, determine the following: • Input Voltage Range • Reference Voltage Accuracy • Output logic input high and low level thresholds • Current Source resistance 10.2.1.2.1 Basic Operation In the configuration shown in Figure 20 TL43xLI will behave as a comparator, comparing the VREF pin voltage to the internal virtual reference voltage. When provided a proper cathode current (IK), TL43xLI will have enough open loop gain to provide a quick response. This can be seen in Figure 21, where the RSUP=10 kΩ (IKA=500 µA) situation responds much slower than RSUP=1 kΩ (IKA=5 mA). With the TL43xLI max Operating Current (IMIN) being 1 mA, operation below that could result in low gain, leading to a slow response. 10.2.1.2.1.1 Overdrive Slow or inaccurate responses can also occur when the reference pin is not provided enough overdrive voltage. This is the amount of voltage that is higher than the internal virtual reference. The internal virtual reference voltage will be within the range of 2.495 V ±(0.5% or 1.0%) depending on which version is being used. The more overdrive voltage provided, the faster the TL43xLI will respond. For applications where TL43xLI is being used as a comparator, it is best to set the trip point to greater than the positive expected error (that is +1.0% for the A version). For fast response, setting the trip point to >10% of the internal VREF should suffice. For minimal voltage drop or difference from Vin to the ref pin, TI recommends to use an input resistor <10 kΩ to provide Iref. |
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