LR9273DG-35-AB5-R datasheet(9/9 Pages) UTC

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LR9273

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

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www.unisonic.com.tw

QW-R502-A30.c

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TYPICAL APPLICATION CIRCUIT(Cont.)

The Output Voltage may be adjustable for any output voltage between its 1.0V reference and its VDD setting level.

An external pair of resistors is required, as shown above.

The complete equation for the output voltage is described step by step as follows;

I2=IIC+I3 ………… (1)

I3=1.0/R3 ………… (2)

Thus,

I2=IIC+1.0/R3 ………… (3)

Therefore,

VOUT=1.0+R2×I2 ………… (4)

Put Equation (3) into Equation (4), then

VOUT=1.0+R2(IIC+1.0/R3)

=1.0(1+R2/R3)+R2×IIC ………… (5)

In 2nd term, or R2×IIC will produce an error in VOUT.

In Equation (5),

IIC=1.0/RIC ………… (6)

R2×IIC=R2×1.0/RIC

=1.0×R2/RIC ………… (7)

For better accuracy, choosing R2(<<RIC) reduces this error.

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exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

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