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參數(shù)資料
| 型號(hào)： | LM26CIM5-XPA |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度傳感器 |
| 英文描述： | Accurate, Factory Preset Thermostat |
| 中文描述： | 準(zhǔn)確，工廠預(yù)設(shè)溫控器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大小： | 586K |
| 代理商： | LM26CIM5-XPA |
Functional Description
LM26 OPTIONS
The LM26 can be factory programmed to have a trip point
anywhere in the range of 55C to +110C.
Applications Hints
AFTER-ASSEMBLY PCB TESTING
The LM26’s V
output allows after-assembly PCB testing
by following a simple test procedure. Simply measuring the
V
output voltage will verify that the LM26 has been
assembled properly and that its temperature sensing cir-
cuitry is functional. The V
output has very weak drive
capability that can be overdriven by 1.5mA. Therefore, one
can simply force the V
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 85C trip point.
1.
Turn on V
+
and measure V
. Then calculate the
temperature reading of the LM26 using the equation:
V
O
= (3.479x10
6
x(T30)
2
) + (1.082x10
2
x(T30)) +
1.8015V
or
(1)
(2)
2.
Verify that the temperature measured in step one is
within (
±
3C + error of reference temperature sensor) of
the ambient/board temperature. The ambient/board tem-
perature (reference temperature) should be measured
using an extremely accurate calibrated temperature sen-
sor.
3.
A. Observe that OS is high.
B. Drive V
TEMP
to ground.
C. Observe that OS is now low.
D. Release the V
TEMP
pin.
E. Observe that OS is now high.
4.
A. Observe that OS is high.
B. Drive V
TEMP
voltage down gradually.
C. When OS goes low, note the V
TEMP
voltage.
D. V
TEMP
Trig = V
TEMP
at OS trigger (HIGH-
>
LOW)
E. Calculate Ttrig using
Equation (2)
.
5.
A. Gradually raise V
TEMP
until OS goes HIGH. Note
V
TEMP
.
B. Calculate T
HYST
using
Equation (2)
.
V
TEMP
LOADING
The V
output has very weak drive capability (40μA
source, 1μA sink). So care should be taken when attaching
circuitry to this pin. Capacitive loading may cause the V
TEMP
output to oscillate. Simply adding a resistor in series as
shown in
Figure 2
will prevent oscillations from occurring. To
determine the value of the resistor follow the guidelines
given in
Table 1
. The same value resistor will work for either
placement of the resistor. If an additional capacitive load is
placed directly on the LM26 output, rather than across
C
LOAD
, it should be at least a factor of 10 smaller than
C
LOAD
.
10132312
LM26-_ _A
10132313
LM26-_ _B
10132314
LM26-_ _C
10132315
LM26-_ _D
FIGURE 1. Output Pin Options Block Diagrams
L
www.national.com
5
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM26CIM5-XPA | 制造商:Texas Instruments 功能描述:THERMAL TRIP 105C SMD SOT-23-5 |
| LM26CIM5-XPA/NOPB | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準(zhǔn)確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產(chǎn)品:Thermostats |
| LM26CIM5XPANOPB | 制造商:NATIONAL 功能描述:Pb Free |
| LM26CIM5X-PHA | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準(zhǔn)確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產(chǎn)品:Thermostats |
| LM26CIM5X-PHA/NOPB | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準(zhǔn)確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產(chǎn)品:Thermostats |
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