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LM20SITLX bảng dữ liệu(PDF) 7 Page - Texas Instruments

tên linh kiện LM20SITLX
Giải thích chi tiết về linh kiện  LM20 2.4V, 10關A, SC70, DSBGA Temperature Sensor
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LM20
www.ti.com
SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013
where T is the middle of the temperature range of interest and m is in V/°C. For example for the temperature
range of TMIN = −30 to TMAX = +100°C:
T = 35°C
(5)
and
m =
−11.77 mV/°C
(6)
The offset of the linear transfer function can be calculated using the following equation:
b = (VOP(TMAX) + VOP(T) − m × (TMAX+T))/2
(7)
where:
VOP(TMAX) is the calculated output voltage at TMAX using the parabolic transfer function for VO
VOP(T) is the calculated output voltage at T using the parabolic transfer function for VO.
Using this procedure the best fit linear transfer function for many popular temperature ranges was calculated in
Table 2. As shown in Table 2 the error that is introduced by the linear transfer function increases with wider
temperature ranges.
Table 2. First Order Equations Optimized for Different Temperature Ranges
Temperature Range
Linear Equation
Maximum Deviation of Linear Equation from
VO =
Parabolic Equation (°C)
Tmin (°C)
Tmax (°C)
−55
130
−11.79 mV/°C × T + 1.8528 V
±1.41
−40
110
−11.77 mV/°C × T + 1.8577 V
±0.93
−30
100
−11.77 mV/°C × T + 1.8605 V
±0.70
-40
85
−11.67 mV/°C × T + 1.8583 V
±0.65
−10
65
−11.71 mV/°C × T + 1.8641 V
±0.23
35
45
−11.81 mV/°C × T + 1.8701 V
±0.004
20
30
–11.69 mV/°C × T + 1.8663 V
±0.004
Mounting
The LM20 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be glued
or cemented to a surface. The temperature that the LM20 is sensing will be within about +0.02°C of the surface
temperature to which the LM20's leads are attached to.
This presumes that the ambient air temperature is almost the same as the surface temperature; if the air
temperature were much higher or lower than the surface temperature, the actual temperature measured would
be at an intermediate temperature between the surface temperature and the air temperature.
To ensure good thermal conductivity the backside of the LM20 die is directly attached to the pin 2 GND pin. The
tempertures of the lands and traces to the other leads of the LM20 will also affect the temperature that is being
sensed.
Alternatively, the LM20 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or
screwed into a threaded hole in a tank. As with any IC, the LM20 and accompanying wiring and circuits must be
kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate at cold
temperatures where condensation can occur. Printed-circuit coatings and varnishes such as Humiseal and epoxy
paints or dips are often used to ensure that moisture cannot corrode the LM20 or its connections.
The thermal resistance junction to ambient (
θJA) is the parameter used to calculate the rise of a device junction
temperature due to its power dissipation. For the LM20 the equation used to calculate the rise in the die
temperature is as follows:
TJ = TA + θJA [(V
+ I
Q) + (V
+ − V
O) IL]
where IQ is the quiescent current and ILis the load current on the output. Since the LM20's junction temperature
is the actual temperature being measured care should be taken to minimize the load current that the LM20 is
required to drive.
The tables shown in Table 3 summarize the rise in die temperature of the LM20 without any loading, and the
thermal resistance for different conditions.
Copyright © 1999–2013, Texas Instruments Incorporated
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