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LM4040D30ILPR 数据表(PDF) 28 Page - Texas Instruments |
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LM4040D30ILPR 数据表(HTML) 28 Page - Texas Instruments |
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28 / 51 page  www.ti.com Cathode and Load Currents R S + V S * VZ (I L ) IZ) (1) LM4040 IZ + IL IL IZ VS VZ RS LM4040 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE SLOS456K – JANUARY 2005 – REVISED MARCH 2008 In a typical shunt-regulator configuration (see Figure 9), an external resistor, RS, is connected between the supply and the cathode of the LM4040. RS must be set properly, as it sets the total current available to supply the load (IL) and bias the LM4040 (IZ). In all cases, IZ must stay within a specified range for proper operation of the reference. Taking into consideration one extreme in the variation of the load and supply voltage (maximum IL and minimum VS), RS must be small enough to supply the minimum IZ required for operation of the regulator, as given by data-sheet parameters. At the other extreme, maximum VS and minimum IL, RS must be large enough to limit IZ to less than its maximum-rated value of 15 mA. RS is calculated according to Equation 1: Figure 9. Shunt Regulator 28 Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated |
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