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TL431LI Fiches technique(PDF) 17 Page - Texas Instruments |
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TL431LI Fiches technique(HTML) 17 Page - Texas Instruments |
17 / 32 page 17 TL431LI TL432LI www.ti.com SLVSDQ6 – JULY 2018 Product Folder Links: TL431LI TL432LI Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 10.2.2.1 Design Requirements For this design example, use the parameters listed in Table 1 as the input parameters. Table 2. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Supply Voltage (VI(BATT)) 5 V Sink Current (IO) 100mA Cathode Current (Ik) 5 mA 10.2.2.2 Detailed Design Procedure When using TL43xLI as a constant current sink, determine the following: • Output Current Range • Output Current Accuracy • Power Consumption for TL43xLI 10.2.2.2.1 Basic Operation In the configuration shown, TL43xLI acts as a control component within a feedback loop of the constant current sink. Working with an external passing component such as an BJT, TL43xLI provides precision current sink with accuracy set by itself and the sense resistor RS. This circuit can also be used as LED driving circuit. 10.2.2.2.1.1 Output Current Range and Accuracy The output current range of the circuit is determined by the equation shown in the configuration. Keep in mind that the VREF equals to 2.495V. When choosing the sense resistor RS, it needs to generate 2.495V for the TL43xLI when IO reaches the target current. If the overhead voltage of 2.495V is not acceptable, please consider lower voltage reference devices such as TLV43x or TLVH43x. The output current accuracy is determined by both the accuracy of TL43xLI chosen, as well as the accuracy of the sense resistor RS. The internal virtual reference voltage of TL43xLI will be within the range of 2.495 V ±(0.5% or 1.0%) depending on which version is being used. Another consideration for the output current accuracy is the temperature coefficient of the TL43xLI and RS. Please refer to the electrical characterization table for the specification of these parameters. 10.2.2.2.2 Power Consumption In order for TL43xLI to properly be used as a control component in this circuit, the minimum operating current needs to be reached. This is accomplished by setting the external biasing resistor in series with the TL43xLI. For TL43xLI, the minimum operating current is 1mA and with margin consideration, most of the designs set this current to be higher than 1mA. To achieve lower power consumption, please consider devices such as ATL43x and ATL43xLI. |
Numéro de pièce similaire - TL431LI |
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Description similaire - TL431LI |
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