LM56_15 Datasheet, PDF (8/22 Pages) Texas Instruments – LM56 Dual Output Low Power Thermostat

LM56
SNIS120G – APRIL 2000 – REVISED FEBRUARY 2013
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V_T1 = 1.250V x (R1)/(R1 + R2 + R3)
V_T2 = 1.250V x (R1 + R2)/(R1 + R2 + R3)
where:
(R1 + R2 + R3) = 27 kΩ and
V_{T1 or T2} = [6.20 mV/°C x T] + 395 mV therefore:
R1 = V_T1/(1.25V) x 27 kΩ
R2 = (V_T2/(1.25V) x 27 k)Ω–R1
R3 = 27 kΩ − R1 − R2
Application Hints
LM56 TRIP POINT ACCURACY SPECIFICATION
For simplicity the following is an analysis of the trip point accuracy using the single output configuration shown in
Figure 14 with a set point of 82°C.
Trip Point Error Voltage = V_TPE,
Comparator Offset Error for V_T1E
Temperature Sensor Error = V_TSE
Reference Output Error = V_RE
Figure 14. Single Output Configuration
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