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[v2-00] 2016-Jun-01

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AS1370 − Application Information

Explanation of Steady State Specifications

Line Regulation

Line regulation is defined as the percentual change in output

voltage when the input (or line) voltage is changed by a known

quantity. It is a measure of the regulator’s ability to maintain a

constant output voltage when the input voltage changes. More

generally:

Line Regulation =

and is a pure number

In practise, line regulation is referred to the regulator output

voltage in terms of % / VOUT. This is particularly useful when the

same regulator is available with numerous output voltage trim

options.

Line Regulation =

[% / V]

Load Regulation

Load regulation is defined as the change of the output voltage

when the load current is changed by a known quantity. It is a

measure of the regulator’s ability to maintain a constant output

voltage when the load changes. Load regulation is a measure

of the DC closed loop output resistance of the regulator. More

generally:

Load Regulation =

[

Ω]

In practise, load regulation is referred to the regulator output

voltage in terms of % / mA. This is particularly useful when the

same regulator is available with numerous output voltage trim

options.

Load Regulation =

[% / mA]

Setting Accuracy

Accuracy of the final output voltage is determined by the

reference accuracy and the input offset voltage of the error

amplifier. When the regulator is supplied pre-trimmed, the

output voltage accuracy is fully defined in the output voltage

specification.

The reference tolerance is given both at 25°C and over the full

operating temperature range.

(EQ8)

ΔV

OUT

ΔV

---------------------

(EQ9)

ΔV

OUT

ΔV

---------------------

100

OUT

-----------------

(EQ10)

ΔV

OUT

ΔI

OUT

---------------------

(EQ11)

ΔV

OUT

ΔI

OUT

---------------------

100

OUT

-----------------

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