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TL431LI Fiches technique(PDF) 18 Page - Texas Instruments |
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TL431LI Fiches technique(HTML) 18 Page - Texas Instruments |
18 / 32 page REF CATHODE ANODE R2 V SUP RSUP R1 VO ( R1 Vref 0.1% R2 0.1% TL43xLIx = 1 + Vref ) CL Copyright © 2017, Texas Instruments Incorporated 18 TL431LI TL432LI SLVSDQ6 – JULY 2018 www.ti.com Product Folder Links: TL431LI TL432LI Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 10.2.3 Shunt Regulator/Reference Figure 23. Shunt Regulator Schematic 10.2.3.1 Design Requirements For this design example, use the parameters listed in Table 1 as the input parameters. Table 3. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Reference Initial Accuracy 1.0 % Supply Voltage 24 V Cathode Current (Ik) 5 mA Output Voltage Level 2.495 V - 36 V Load Capacitance 2 µF Feedback Resistor Values and Accuracy (R1 and R2) 10 kΩ 10.2.3.2 Detailed Design Procedure When using TL43xLI as a Shunt Regulator, determine the following: • Input Voltage Range • Temperature Range • Total Accuracy • Cathode Current • Reference Initial Accuracy • Output Capacitance 10.2.3.2.1 Programming Output/Cathode Voltage In order to program the cathode voltage to a regulated voltage a resistive bridge must be shunted between the cathode and anode pins with the mid point tied to the reference pin. This can be seen in Figure 23, with R1 and R2 being the resistive bridge. The cathode/output voltage in the shunt regulator configuration can be approximated by the equation shown in Figure 23. The cathode voltage can be more accurate determined by taking in to account the cathode current: Vo=(1+R1/R2)VREF-IREFR1 (1) In order for this equation to be valid, TL43xLI must be fully biased so that it has enough open loop gain to mitigate any gain error. This can be done by meeting the Imin spec denoted in Specifications. |
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