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ST1115C Fiches technique(PDF) 9 Page - Silicon Touch Technology Inc.

No de pièce ST1115C
Description  PWM Speed Control Double Coil Brushless DC Motor Driver
Download  13 Pages
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Fabricant  SITI [Silicon Touch Technology Inc.]
Site Internet  http://www.siti.com.tw
Logo SITI - Silicon Touch Technology Inc.

ST1115C Fiches technique(HTML) 9 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
:8
3. Fan speed control by the PWM command
―Refer to Figure 5.
VSS
VSS
VSS
VSS
VSS
VSS
VSS
Q1
R4
R3
R1
PWM
R2
10K
75
1u
1u
IC
Hall
ST1115C
C1
RD
Digital Power
GND
Hin
VT
CF
C2
O2
O1
Analog Power
Z2
Z1
D1
RD
VDD
Figure 5. Fan speed control via the PWM command.
(1) Figure 5 shows the application circuit, where the fan speed is directly controlled by the
PWM command. The BJT Q1 together with resistors R1 and R2 constitutes an inverting
level shifter, which is responsible for translating the voltage level of the PWM command
to the VDD voltage level of the drive IC. In this way, the voltage level of the PWM
command can be very low, say, 2 Volt, for example.
(2) For this circuit, the PWM command is active high and its frequency range is 200 Hz ~
40 KHz. If low acoustic noise is desired, the 20 KHz~40 KHz of the PWM frequency
range is recommended.


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