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LM20SIBP Fiches technique(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM20SIBP
Description  LM20 2.4V, 10關A, SC70, micro SMD Temperature Sensor
Download  9 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM20SIBP Fiches technique(HTML) 6 Page - National Semiconductor (TI)

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2.0 Mounting (Continued)
3.0 Capacitive Loads
The LM20 handles capacitive loading well. Without any pre-
cautions, the LM20 can drive any capacitive load less than
300 pF as shown in
Figure 4. Over the specified temperature
range the LM20 has a maximum output impedance of 160
Ω.
In an extremely noisy environment it may be necessary to
add some filtering to minimize noise pickup. It is recom-
mended that 0.1 µF be added from V
+ to GND to bypass the
power supply voltage, as shown in
Figure 5. In a noisy envi-
ronment it may even be necessary to add a capacitor from
the output to ground with a series resistor as shown in
Figure
5. A 1 µF output capacitor with the 160
Ω maximum output
impedance and a 200
Ω series resistor will form a 442 Hz
lowpass filter. Since the thermal time constant of the LM20 is
much slower, the overall response time of the LM20 will not
be significantly affected.
4.0 LM20 micro SMD Light Sensitivity
Exposing the LM20 micro SMD package to bright sunlight
may cause the output reading of the LM20 to drop by 1.5V. In
a normal office environment of fluorescent lighting the output
voltage is minimally affected (less than a millivolt drop). In ei-
ther case it is recommended that the LM20 micro SMD be
placed inside an enclosure of some type that minimizes its
light exposure. Most chassis provide more than ample pro-
tection. The LM20 does not sustain permanent damage from
light exposure. Removing the light source will cause LM20’s
output voltage to recover to the proper value.
SC70-5
SC70-5
no heat sink
small heat sink
θ
JA
T
J −TA
θ
JA
T
J −TA
(˚C/W)
(˚C)
(˚C/W)
(˚C)
Still air
412
0.2
350
0.19
Moving
air
312
0.17
266
0.15
See
Figure 1 for PCB layout samples.
micro SMD
micro SMD
no heat sink
small heat fin
θ
JA
T
J −TA
θ
JA
T
J −TA
(˚C/W)
(˚C)
(˚C/W)
(˚C)
Still air
TBD
TBD
TBD
TBD
Moving
air
TBD
TBD
TBD
TBD
FIGURE 3. Temperature Rise of LM20 Due to
Self-Heating and Thermal Resistance (
θ
JA)
DS100908-15
FIGURE 4. LM20 No Decoupling Required for
Capacitive Loads Less than 300 pF.
R(
Ω)
C (µF)
200
1
470
0.1
680
0.01
1 k
0.001
DS100908-16
DS100908-33
FIGURE 5. LM20 with Filter for Noisy Environment and Capacitive Loading greater than 300 pF. Either placement of
resistor as shown above is just as effective.
www.national.com
6


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