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LM26 датащи(PDF) 9 Page - Texas Instruments

номер детали LM26
подробное описание детали  Accurate, Factory-Preset Thermostat
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM26 датащи(HTML) 9 Page - Texas Instruments

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6
TEMP
6
1.8015
V
T
1525.04
2.4182
10
3.479
10-
-
= -
+
´
+
´
6
2
2
O
V = (
3.47 10
(T
30) ) + (1.082 10
(T
30)) + 1.8015 V
-
-
-
´
´
-
´
´
-
LM26
V+
VTEMP
GND
HYST
OS/OS/US/
US
CLOAD
R
0.12f
Heavy Capacitive
Load, Cable/Wiring
LM26
V+
VTEMP
GND
HYST
OS/OS/US/
US
CLOAD
R
0.12f
Heavy Capacitive
Load, Cable/Wiring
LM26
www.ti.com
SNIS115S – MAY 2001 – REVISED SEPTEMBER 2015
Figure 6. Resistor Placement for Capacitive-
Figure 7. Resistor Placement for Capacitive-
Loading Compensation of VTEMP With R in Series
Loading Compensation of VTEMP With R in Series
With Capacitor
With Signal Path
8.4 Device Functional Modes
The LM26 after factory programming has two functional modes one with 2°C Hysteresis and the other with 10°C
hysteresis as programmed by the level of the HYST pin. Selection of the level will depend on the system noise
and the temperature transition rate.
8.4.1 After Assembly PCB Testing
The LM26's VTEMP output allows after-assembly PCB testing by following a simple test procedure. Simply
measuring the VTEMP output voltage will verify that the LM26 has been assembled properly and that its
temperature sensing circuitry is functional. The VTEMP output has very weak drive capability that can be
overdriven by 1.5mA. Therefore, one can simply force the VTEMP voltage to cause the digital output to change
state, thereby verifying that the comparator and output circuitry function after assembly. Here is a sample test
procedure that can be used to test the LM26CIM5-TPA which has an 85°C trip point.
1. Turn on V+ and measure VTEMP. Then calculate the temperature reading of the LM26 using the equation:
(3)
or
(4)
2. Verify that the temperature measured in step one is within (±3°C + error of reference temperature sensor) of
the ambient/board temperature. The ambient/board temperature (reference temperature) should be
measured using an extremely accurate calibrated temperature sensor.
3.
(a) Observe that OS is high.
(b) Drive VTEMP to ground.
(c) Observe that OS is now low.
(d) Release the VTEMP pin.
(e) Observe that OS is now high.
4.
(a) Observe that OS is high.
(b) Drive VTEMP voltage down gradually.
(c) When OS goes low, note the VTEMP voltage.
(d) VTEMPTrig = VTEMP at OS trigger (HIGH->LOW)
(e) Calculate Trig using Equation 2.
5.
(a) Gradually raise VTEMP until OS goes HIGH. Note VTEMP.
(b) Calculate THYST using Equation 2.
Copyright © 2001–2015, Texas Instruments Incorporated
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