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TL431LI Fiches technique(PDF) 15 Page - Texas Instruments

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No de pièce TL431LI
Description  Programmable Shunt Regulator with Optimized Reference Current
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TL431LI Fiches technique(HTML) 15 Page - Texas Instruments

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TL431LI
TL432LI
www.ti.com
SLVSDQ6 – JULY 2018
Product Folder Links: TL431LI TL432LI
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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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