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ST1115D Datenblatt(PDF) 6 Page - Silicon Touch Technology Inc.

Teilenummer ST1115D
Bauteilbeschribung  PWM Speed Control Double Coil Brushless DC Motor Driver
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Hersteller  SITI [Silicon Touch Technology Inc.]
Direct Link  http://www.siti.com.tw
Logo SITI - Silicon Touch Technology Inc.

ST1115D Datenblatt(HTML) 6 Page - Silicon Touch Technology Inc.

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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


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