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LM26 датащи(PDF) 10 Page - Texas Instruments

номер детали LM26
подробное описание детали  Accurate, Factory-Preset Thermostat
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM26 датащи(HTML) 10 Page - Texas Instruments

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12V
System Fan
Sanyo Denki
109R0612T4H12
LM26
V+
VTEMP
GND
HYST
OS
10k
0.12f
+5V
LM26
SNIS115S – MAY 2001 – REVISED SEPTEMBER 2015
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The LM26 thermostat (temperature switch) can be used in applications such as microprocessor thermal
management, appliances, fan control, industrial process control, power supplies for system protection, fan speed
adjust or plain temperature monitoring.
9.2 Typical Application
Figure 8. Two-Speed Fan Speed Control
9.2.1 Design Requirements
The requirement is to change speed fo a fan to maximum at 45°C with an accuracy of
Table 2. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Min Fan Speed
1900 RPM
Max Fan Speed
3800 RPM
Temperature Threshold To Switch From Min Speed to Max Speed
45°C
Threshold accuracy
±3°C
9.2.2 Detailed Design Procedure
The design procedure is simple. A fan was selected that has the capability to be controlled by an external NTC
thermistor. The recommended NTC thermistor adjusts the fan speed to maximum at 40°C. The LM26 meets the
threshold accuracy requirements for temperature control of the fan speed and allows setting the max speed
temperature threshold higher as required to 45°C. The resistance of the thermistor for the min fan speed is 6.8
k
Ω. Since thermistors have a negative temperature coefficient (NTC), 10 kΩ was chosen to ensure that the fan is
at min speed when the LM26 OS is off. When the OS output goes low at 45°C it simulates the low thermistor
resistance at higher temperatures thus setting fan to max speed.
10
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