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LM20BIM7 Folha de dados(PDF) 8 Page - Texas Instruments

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Nome de Peças LM20BIM7
Descrição Electrónicos  LM20 2.4V, 10關A, SC70, DSBGA Temperature Sensor
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM20BIM7 Folha de dados(HTML) 8 Page - Texas Instruments

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LM20
SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013
www.ti.com
Table 3. Temperature Rise of LM20 Due to Self-Heating and Thermal Resistance (
θJA)
(1)
SC70-5
SC70-5
No Heat Sink
Small Heat Sink
θJA
TJ − TA
θJA
TJ − TA
(°C/W)
(°C)
(°C/W)
(°C)
Still air
412
0.2
350
0.19
Moving air
312
0.17
266
0.15
(1)
See PCB Layouts Used For Thermal Measurements for PCB layout samples.
DSBGA
DSBGA
No Heat Sink
Small Heat Sink
θJA
TJ − TA
θJA
TJ − TA
(°C/W)
(°C)
(°C/W)
(°C)
Still air
340
0.18
TBD
TBD
Moving air
TBD
TBD
TBD
TBD
Capacitive Loads
The LM20 handles capacitive loading well. Without any precautions, the LM20 can drive any capacitive load less
than 300 pF as shown in Figure 6. 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 recommended that 0.1
μF be added from V+ to GND to bypass the power supply voltage, as
shown in Figure 7. In a noisy environment it may even be necessary to add a capacitor from the output to ground
with a series resistor as shown in Figure 7. 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.
Figure 6. 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
8
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM20


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