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LM20EP bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM20EP
Giải thích chi tiết về linh kiện  Enhanced Plastic 2.4V, 10uA, SC70, micro SMD Temperature Sensor
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM20EP bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI)

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Mounting (Continued)
Capacitive Loads
The LM20EP handles capacitive loading well. Without any
precautions, the LM20EP can drive any capacitive load less
than 300 pF as shown in Figure 4. Over the specified tem-
perature range the LM20EP has a maximum output imped-
ance 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 5.Ina
noisy environment it may even be necessary to add a ca-
pacitor from the output to ground with a series resistor as
shown in Figure 5. A 1 µF output capacitor with the 160
maximum output impedance and a 200
Ω series resistor will
form a 442 Hz lowpass filter. Since the thermal time constant
of the LM20EP is much slower, the overall response time of
the LM20EP will not be significantly affected.
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
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)
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
340
0.18
TBD
TBD
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)
Moving air
TBD
TBD
TBD
TBD
FIGURE 3. Temperature Rise of LM20EP Due to
Self-Heating and Thermal Resistance (
θ
JA)
20099915
FIGURE 4. LM20EP 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
20099916
20099933
FIGURE 5. LM20EP 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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