Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

LM27 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM27
Descripción Electrónicos  SOT-23, 3 Degree Celcious Accurate, 120-150 Degree Celcious Factory Preset Thermostat
Download  9 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM27 Datasheet(HTML) 6 Page - National Semiconductor (TI)

  LM27 Datasheet HTML 1Page - National Semiconductor (TI) LM27 Datasheet HTML 2Page - National Semiconductor (TI) LM27 Datasheet HTML 3Page - National Semiconductor (TI) LM27 Datasheet HTML 4Page - National Semiconductor (TI) LM27 Datasheet HTML 5Page - National Semiconductor (TI) LM27 Datasheet HTML 6Page - National Semiconductor (TI) LM27 Datasheet HTML 7Page - National Semiconductor (TI) LM27 Datasheet HTML 8Page - National Semiconductor (TI) LM27 Datasheet HTML 9Page - National Semiconductor (TI)  
Zoom Inzoom in Zoom Outzoom out
 6 / 9 page
background image
Applications Hints (Continued)
TABLE 1. Resistive compensation for capacitive
loading of V
TEMP
C
LOAD
R(
Ω)
≤100pF
0
1nF
8200
10nF
3000
100nF
1000
≥1µF
430
NOISE CONSIDERATIONS
The LM27 has excellent power supply noise rejection. Listed
below is a variety of signals used to test the LM27 power
supply rejection. False triggering of the output was not ob-
served when these signals where coupled into the V+ pin of
the LM27.
square wave 400kHz, 1Vp-p
square wave 2kHz, 200mVp-p
sine wave 100Hz to 1MHz, 200mVp-p
Testing was done while maintaining the temperature of the
LM27 one degree centigrade way from the trip point with the
output not activated.
MOUNTING CONSIDERATIONS
The LM27 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 LM27 is
sensing will be within about +0.06˚C of the surface tempera-
ture to which the LM27’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
LM27 die is directly attached to the GND pin (pin 2). The
temperatures of the lands and traces to the other leads of the
LM27 will also affect the temperature that is being sensed.
Alternatively, the LM27 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 LM27 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 conden-
sation 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 LM27 or its connec-
tions.
The junction to ambient thermal resistance (
θ
JA) is the pa-
rameter used to calculate the rise of a part’s junction tem-
perature due to its power dissipation. For the LM27 the
equation used to calculate the rise in the die junction tem-
perature is as follows:
(3)
where T
A is the ambient temperature, V
+ is the power supply
voltage, I
Q is the quiescent current, IL_TEMP is the load
current on the V
TEMP output, VDO is the voltage on the digital
output, and I
DO is the load current on the digital output. Since
the LM27’s junction temperature is the actual temperature
being measured, care should be taken to minimize the load
current that the LM27 is required to drive.
The tables shown in Figure 3 summarize the thermal resis-
tance for different conditions and the rise in die temperature
of the LM27 without any loading on V
TEMP and a 10k pull-up
resistor on an open-drain digital output with a 5.5V power
supply.
20030717
a) R in series with capacitor
20030718
b) R in series with signal path
FIGURE 2. Resistor placement for capacitive loading
compensation of V
TEMP
SOT23-5
no heat sink
SOT23-5
small heat sink
θ
JA
(˚C/W)
T
J−TA
(˚C)
θ
JA
(˚C/W)
T
J−TA
(˚C)
Still Air
250
0.11
TBD
TBD
Moving Air
TBD
TBD
TBD
TBD
FIGURE 3. Thermal resistance (
θ
JA) and temperature
rise due to self heating (T
J−TA)
www.national.com
6


Número de pieza similar - LM27

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
National Semiconductor ...
LM27 NSC-LM27 Datasheet
584Kb / 10P
   SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
logo
Texas Instruments
LM27 TI1-LM27 Datasheet
1,015Kb / 17P
[Old version datasheet]   LM27 SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
logo
National Semiconductor ...
LM27-2PLMDA NSC-LM27-2PLMDA Datasheet
237Kb / 10P
   짹3째C Accurate, 120째C-150째C Factory Preset Thermostat (LM27 in Die Form)
logo
Texas Instruments
LM27-2PLMDA TI1-LM27-2PLMDA Datasheet
1,015Kb / 17P
[Old version datasheet]   LM27 SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
logo
National Semiconductor ...
LM2700 NSC-LM2700 Datasheet
478Kb / 17P
   600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter
More results

Descripción similar - LM27

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
National Semiconductor ...
LM26 NSC-LM26_07 Datasheet
283Kb / 10P
   SOT-23, 짹3째C Accurate, Factory Preset Thermostat
logo
Texas Instruments
LM26CIM5X-SHA TI1-LM26CIM5X-SHA Datasheet
292Kb / 12P
[Old version datasheet]   LM26 SOT-23, /-3C Accurate, Factory Preset Thermostat
LM26CIM5 TI-LM26CIM5 Datasheet
947Kb / 20P
[Old version datasheet]   LM26 SOT-23, 3C Accurate, Factory Preset Thermostat
logo
National Semiconductor ...
LM27 NSC-LM27_06 Datasheet
584Kb / 10P
   SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
logo
Texas Instruments
LM26 TI-LM26_15 Datasheet
950Kb / 24P
[Old version datasheet]   Accurate, Factory-Preset Thermostat
LM27 TI-LM27_15 Datasheet
981Kb / 17P
[Old version datasheet]   LM27 SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
logo
National Semiconductor ...
LM26 NSC-LM26 Datasheet
586Kb / 9P
   Accurate, Factory Preset Thermostat
logo
Texas Instruments
LM27 TI1-LM27_16 Datasheet
1,015Kb / 17P
[Old version datasheet]   LM27 SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
logo
National Semiconductor ...
LM26NV NSC-LM26NV Datasheet
268Kb / 12P
   SOT-23, 짹3째C Accurate, Factory Preset Thermostat (LM26 without VTEMP output)
logo
Texas Instruments
LM26NV TI-LM26NV_15 Datasheet
739Kb / 17P
[Old version datasheet]   LM26NV SOT-23, 짹3째C Accurate, Factory Preset Thermostat (LM26 without VTEMP output)
More results


Html Pages

1 2 3 4 5 6 7 8 9


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com