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LM317HVH 데이터시트(PDF) 9 Page - Texas Instruments |
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LM317HVH 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 28 page ( ) OUT REF ADJ R V = V I R R 2 2 1 1 æ ö + + ç ÷ è ø LM117HV, LM317HV www.ti.com SNVS773D – APRIL 2000 – REVISED SEPTEMBER 2015 8 Detailed Description 8.1 Overview In operation, the LM317HV 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 by Equation 1: (1) Figure 13. Adjustable VOUT Through R1 and R2 Because the 100- μA current from the adjustment terminal represents an error term, the LM317HV 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 will rise. 8.2 Functional Block Diagram Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM117HV LM317HV |
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