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LM1117S-ADJ Datasheet(PDF) 11 Page - Texas Instruments |
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LM1117S-ADJ Datasheet(HTML) 11 Page - Texas Instruments |
11 / 36 page LM1117 www.ti.com SNOS412N – FEBRUARY 2000 – REVISED JANUARY 2016 7 Detailed Description 7.1 Overview The LM1117 adjustable version develops a 1.25V reference voltage, VREF, between the output and the adjust terminal. As shown in Figure 10, this voltage is applied across resistor R1 to generate a constant current I1. The current IADJ from the adjust terminal could introduce error to the output. But since it is very small (60µA) compared with the I1 and very constant with line and load changes, the error can be ignored. The constant current I1 then flows through the output set resistor R2 and sets the output voltage to the desired level. For fixed voltage devices, R1 and R2 are integrated inside the devices. Figure 10. Basic Adjustable Regulator 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Load Regulation The LM1117 regulates the voltage that appears between its output and ground pins, or between its output and adjust pins. In some cases, line resistances can introduce errors to the voltage across the load. To obtain the best load regulation, a few precautions are needed. Copyright © 2000–2016, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM1117 |
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