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LMS1585 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMS1585
Description  5A and 3A Low Dropout Fast Response Regulators
PDF  8 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMS1585 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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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
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