Datenblatt-Suchmaschine für elektronische Bauteile |
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ST1115D Datenblatt(PDF) 6 Page - Silicon Touch Technology Inc. |
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ST1115D Datenblatt(HTML) 6 Page - Silicon Touch Technology Inc. |
6 / 13 page 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1115C/ST1115D SP-ST1115CD-A.005 Version :A.005 Page :5 Application Circuits and Designer’s Notes 1. Temperature-sensing fan speed control ―Refer to Figure 1. Figure 1. Fan speed control by the external temperature sensor. (1) If the linear temperature control is desired, the VT terminal is connected to a thermistor-resistor divider, as shown in Fig. 1. In this way, the fan speed can vary linearly with respect to the temperature variation; the higher temperature results in the faster speed. (2) Figure 2 illustrates the desired temperature-speed curve. Assume that the resistance of the thermistor is RT1 when the temperature is at T1, and RT2 at T2. Also assume that the voltage V1 applied to the VT pin will result in the fan speed rpm1, and V2 applied to the VT pin yielding rpm2. Note that the relation between the VT voltage and the fan speed depends on the size and the coil impedance of the fan. To obtain the desired temperature-speed curve, the resistance values of R1 and R2 in Fig. 1 can be roughly selected by the following equations. HALL IC LOGIC BLOCK + - PWM CONTROL LOCK DETECTION and PROTECTION VDD CF HIN GND FGR O1 O2 VT POWER CF VDD D1 COM 75 ohm VT |
Ähnliche Teilenummer - ST1115D |
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Ähnliche Beschreibung - ST1115D |
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