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ATL43XLI Datasheet(PDF) 16 Page - Texas Instruments |
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ATL43XLI Datasheet(HTML) 16 Page - Texas Instruments |
16 / 29 page ATL43xLIx RS 0.1% IO VI(BATT) I O V ref R S = Copyright © 2017, Texas Instruments Incorporated 16 ATL431LI ATL432LI SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019 www.ti.com Product Folder Links: ATL431LI ATL432LI Submit Documentation Feedback Copyright © 2017–2019, Texas Instruments Incorporated 11.2.2 Precision Constant Current Sink Figure 25. Precision Constant Current Sink Application Schematic 11.2.2.1 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 11.2.2.2 Detailed Design Procedure When using ATL43xLI as a constant current sink, determine the following: • Output Current Range • Output Current Accuracy • Power Consumption for ATL43xLI 11.2.2.2.1 Basic Operation In the configuration shown, ATL43xLI acts as a control component within a feedback loop of the constant current sink. Working with an external passing component such as an BJT, ATL43xLI provides precision current sink with accuracy set by itself and the sense resistor RS. This circuit can also be used as LED driving circuit. 11.2.2.2.1.1 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 2.5V. When choosing the sense resistor RS, it needs to generate 2.5V for the ATL43xLI when IO reaches the target current. If the overhead voltage of 2.5V 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 ATL43xLI chosen, as well as the accuracy of the sense resistor RS. The internal virtual reference voltage of ATL43xLI will be within the range of 2.5 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 ATL43xLI and RS. Please refer to the electrical characterization table for the specification of these parameters. 11.2.2.2.2 Power Consumption In order for ATL43xLI 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 ATL43xLI. For ATL43xLI, the minimum operating current is 80µA and with margin consideration, most of the designs set this current to be higher than 100µA. To achieve lower power consumption, please consider devices such as ATL43x. |
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