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LMS1587CSX-ADJ Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LMS1587CSX-ADJ Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 8 page Application Note OUTPUT VOLTAGE The adjustable version develops at 1.25V reference voltage, (V REF), between the output and the adjust terminal. As shown in Figure 1, this voltage is applied across resistor R1 to generate a constant current I1. This constant current then flows through R2. The resulting voltage drop across R2 adds to the reference voltage to sets the desired output voltage. The current I ADJ from the adjustment terminal introduces an output error. But since it is small (120µA max), it becomes negligible when R1 is in the 100 Ω range. For fixed voltage devices, R1 and R2 are integrated inside the devices. 10119772 FIGURE 1. Basic Adjustable Regulator www.national.com 6 |
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