LR9273BL-AD-S08-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.a



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.

UTC assumes no responsibility for equipment failures that result from using products at values that

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

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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