LM20 datasheet(6/18 Pages) TI1

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LM20

SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013

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Typical Performance Characteristics

Temperature Error

Temperature

Figure 3.

PCB LAYOUTS USED FOR THERMAL MEASUREMENTS

Figure 4. Layout Used For No Heat Sink Measurements

Figure 5. Layout Used For Measurements With Small Heat Sink

LM20 Transfer Function

The LM20 transfer function can be described in different ways with varying levels of precision. A simple linear

transfer function, with good accuracy near 25°C, is

VO = −11.69 mV/°C × T + 1.8663 V

(1)

Over the full operating temperature range of

−55°C to 130°C, best accuracy can be obtained by using the

parabolic transfer function.

VO = (−3.88×10

−6×T2) + (−1.15×10−2×T) + 1.8639

(2)

solving for T:

(3)

A linear transfer function can be used over a limited temperature range by calculating a slope and offset that give

best results over that range. A linear transfer function can be calculated from the parabolic transfer function of

the LM20. The slope of the linear transfer function can be calculated using the following equation:

m =

−7.76 × 10

−6× T − 0.0115,

(4)

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LM20 Datasheet(PDF) 6 Page - Texas Instruments