LMS1587ISX-ADJ datasheet(6/8 Pages) NSC

Part #	LMS1587ISX-ADJ

Description	5A and 3A Low Dropout Fast Response Regulators

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Manufacturer	NSC [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

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