TLC2274CPWR.B datasheet(27/61 Pages) TI2

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BAT

4 (Tol)

R R

OUT

LOAD

OUT

BAT

LOAD

(4 Tol)

2 Tol 1

R R

= ±

ç +

Tol

TLC2272, TLC2272A, TLC2272M, TLC2272AM

TLC2274, TLC2274A, TLC2274M, TLC2274AM

www.ti.com

SLOS190H – FEBRUARY 1997 – REVISED MARCH 2016

Product Folder Links: TLC2272 TLC2272A TLC2272M TLC2272AM TLC2274 TLC2274A TLC2274M TLC2274AM

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However, as the resistors have tolerances, they cannot be perfectly matched.

R1 = R ± ΔR1

R2 = R2 ± ΔR2

R = R ±

ΔR

Rg = Rg ± ΔRg

(4)

By developing the equations and neglecting the second order, the worst case is when the tolerances add up.

This is shown by Equation 5.

where

•

Tol = 0.01 for 1%

•

Tol = 0.001 for 0.1%

(5)

If the resistors are perfectly matched, then Tol = 0 and VOUT is calculated using Equation 6.

(6)

The highest error is from the Common mode, as shown in Equation 7.

(7)

Gain of 10, Rg / R = 10, and Tol = 1%:

Common mode error = ((4 × 0.01) / 1.1) × 12 V = 0.436 V

Gain of 10 and Tol = 0.1%:

Common mode error = 43.6 mV

The resistors were chosen from 2% batches.

R1 and R 12 kΩ

R2 and Rg 120 kΩ

Ideal Gain = 120 / 12 = 10

The measured value of the resistors:

R1 = 11.835 kΩ

R = 11.85 k

R2 = 117.92 kΩ

Rg = 118.07 kΩ

TLC2274CPWR.B 数据表(PDF) 27 Page - Texas Instruments

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