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LM317T bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LM317T bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 48 page LM317-N ( ) OUT ADJ R V = 1.25 V I R R 2 2 1 1 æ ö + + ç ÷ è ø LM117, LM317-N www.ti.com SNVS774P – MAY 2004 – REVISED OCTOBER 2015 8 Detailed Description 8.1 Overview In operation, the LM317-N 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, because 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 15. Setting the VOUT Voltage Because the 100- μA current from the adjustment terminal represents an error term, the LM317-N 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. Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM117 LM317-N |
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