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LM338KSTEEL Datasheet(PDF) 11 Page - Texas Instruments |
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LM338KSTEEL Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page Copyright © 2016, Texas Instruments Incorporated TI DEVICE OUT REF ADJ R 2 V = V 1+ + I R 2 R 2 æ ö ç ÷ è ø 11 LM338-MIL www.ti.com SNVSAX2 – JUNE 2017 Product Folder Links: LM338-MIL Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information In operation, the LM338-MIL develops a nominal 1.25-V reference voltage (VREF) between the output and adjustment terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage calculated with Equation 1. (1) Figure 15. Typical Application Circuit Because the 50-µA current from the adjustment terminal represents an error term, the LM338-MIL was designed to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output rises. |
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