R1

4.1V

R3

R2

0.1 PF

U3

LM4040

R4

VOUT

V+

VT

VTemp

+

-

U1

LM61

V+

U2

(Low = overtemp alarm)

VT1

VT2

VTEMP

VOUT

VT1 =

R1 + R2||R3

(4.1)R2

VT2 =

R2 + R1||R3

(4.1)R2||R3

LM7211

Copyright © 2016, Texas Instruments Incorporated

10

LM61

SNIS121J – JUNE 1999 – REVISED NOVEMBER 2016

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Product Folder Links: LM61

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Copyright © 1999–2016, Texas Instruments Incorporated

8.2.1.3 Application Curve

Figure 14. Accuracy vs Temperature

8.2.2 Other Application Circuits

Figure 15 shows an application circuit example using the LM61 device. Customers must fully validate and test

any circuit before implementing a design based on an example in this section. Unless otherwise noted, the

design procedures in Typical Temperature Sensing Circuit are applicable.

Figure 15. Centigrade Thermostat

Figure 16. Conserving Power Dissipation with Shutdown