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PDF AD22105 Data sheet ( Hoja de datos )
| Número de pieza | AD22105 | |
| Descripción | Low Voltage/ Resistor Programmable Thermostatic Switch | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD22105 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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FEATURES
User-Programmable Temperature Setpoint
2.0؇C Setpoint Accuracy
4.0؇C Preset Hysteresis
Wide Supply Range (+2.7 V dc to +7.0 V dc)
Wide Temperature Range (–40؇C to +150؇C)
Low Power Dissipation (230 W @ 3.3 V)
APPLICATIONS
Industrial Process Control
Thermal Control Systems
CPU Monitoring (i.e., Pentium)
Computer Thermal Management Circuits
Fan Control
Handheld/Portable Electronic Equipment
Low Voltage, Resistor Programmable
Thermostatic Switch
AD22105
FUNCTIONAL BLOCK DIAGRAM
RPULL–UP 1
OUT 2
GND 3
NC 4
AD22105
200kΩ
SET–
POINT
TEMPERATURE
SENSOR
8 NC
7 VS
6 RSET
5 NC
GENERAL DESCRIPTION
The AD22105 is a solid state thermostatic switch. Requiring
only one external programming resistor, the AD22105 can be set
to switch accurately at any temperature in the wide operating
range of –40°C to +150°C. Using a novel circuit architecture,
the AD22105 asserts an open collector output when the ambient
temperature exceeds the user-programmed setpoint temperature.
The AD22105 has approximately 4°C of hysteresis which prevents
rapid thermal on/off cycling.
The AD22105 is designed to operate on a single power supply
voltage from +2.7 V to +7.0 V facilitating operation in battery
powered applications as well as in industrial control systems.
Because of low power dissipation (230 µW @ 3.3 V), self-
heating errors are minimized and battery life is maximized.
An optional internal 200 kΩ pull-up resistor is included to
facilitate driving light loads such as CMOS inputs.
Alternatively, a low power LED indicator may be driven directly.
+2.7V TO +7.0V
87 65
AD22105
TOP VIEW
RSET
OUT
12
34
Figure 1. Typical Application Circuit
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
0.4
0.3
TA = +150°C
0.2 TA = +25°C
0.1 TA = –40°C
0.0
1µA
10µA
100µA
IOUT
1mA
10mA
Figure 9. VOUT vs. IOUT (VOUT = LOW)
16
14
12
10
8
6
4
2
0 400 800 1200
FLOW RATE – CFM
Figure 10. Thermal Response vs. Flow Rate
AD22105
250
200
150
100
50
0 400 800 1200
FLOW RATE – CFM
Figure 11. Thermal Resistance vs. Flow Rate
100
90
80
70 MOVING AIR
(1200 CFM)
60
STILL AIR
50
40
30
20
10
0
0 10 20 30 40 50 60
TIME – sec
Figure 12. Thermal Response Time
REV. 0
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AD22105.PDF ] | |
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