0

R(T)

R(T ) (1

T)

D

u

'

Temperature (qC)

-60

-40

-20

0

20

40

60

80

100 120 140 160

0

1

2

3

4

5

d012

18

TMP61

SBOS921C – DECEMBER 2018 – REVISED SEPTEMBER 2019

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Typical Application (continued)

Figure 16. NTC With and Without a Linearization Resistor vs. TMP61 Temperature Voltages

9.2.1.2.1

Thermal Compensation

The TMP61 can be used to compensate for components within systems whose characteristics vary over

temperature. For example, resistors will change with temperature based on their specified temperature

coefficient. In certain systems where these resistors are included in the feedback loop, the performance over

temperature may be greatly affected by the changes in resistance. Examples include components like those in

control systems within the feedback loop, linear dropout regulators with feedback resistors, and solenoids or coils

with varying impedance. One implementation is to put the TMP61 in a feedback loop to compensate for

temperature drift, along with other resistive components to better control the temperature coefficient (α) of the

compensation circuit.

Equation 5 can describe this type of circuit:

where

•

•

the temperature coefficient, α, is specified (25°C)

•

(5)

This circuit is shown in Figure 17.