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LM26CIM5-RPA Arkusz danych(PDF) 10 Page - Texas Instruments |
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LM26CIM5-RPA Arkusz danych(HTML) 10 Page - Texas Instruments |
10 / 24 page 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 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: LM26 |
Podobny numer części - LM26CIM5-RPA |
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Podobny opis - LM26CIM5-RPA |
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