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ST1117B PDF预览

ST1117B

更新时间： 2022-12-26 09:10:08
品牌 Logo 应用领域
点晶 - SITI 驱动器
页数 文件大小 规格书
7页 220K
描述
Single Coil Brushless DC Motor Drivers ( 1.5 to 8.5 Volts )

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中文翻译

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ST1117B 数据手册

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點晶科技股份有限公司  
SILICON TOUCH TECHNOLOGY INC.  
ST1117A / ST1117B /ST1117C  
Application Notes  
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With low voltage start-up feature, the device is operated within wide supply  
voltage range from 1.5 to 7.5 Volts. The design, specifications and performance  
have been optimized for 3V and 5V brushless DC motor applications.  
The output driver node O1/O2 will be “turned to sink/drive” for V(HIN) = logic  
low. Similarly, the output O1/O2 will be “turned to drive/sink” for V(HIN) =  
logic high .  
The FGR pin is an open-drained output. The output frequency is dividing the hall  
switching frequency with 2 for ST1117A, the same frequency with hall switching  
for ST1117B, and the rotating detection for ST1117C. With suitable pull up, the  
fan tachometer output can be used directly with bipolar or MOS logic for motor  
speed monitoring/control. To get better FG signal output, increasing stability of  
power system is required.  
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The pull up resistor about 20KΩ is connected to PWM pin. The PWM command  
is active high. If low acoustic noise is desired, the PWM frequency range below  
200Hz or 20KHz ~ 40KHz is recommended.  
There is no need of external timing capacitor for lock protection and auto-restart  
function. For 5V application, the drivers will be shut down roughly 1 to 3 seconds  
after the motor is locked. When the drivers have been shut down, the automatic  
self-restart circuit will try to power up the drivers every 1 to 3 seconds until lock  
is released.  
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There is no requirement of protection diode for power reverse fault in normal  
applications. The power polarity reverse protection circuit is built-in.  
The capacitor between two ends of coil ( *3 in application circuit) is proposed to  
connect 0.1μF for PWM application and 1μF for full-speed application.  
The connection of the capacitor or Zener Diode (*1 in application circuit)  
between VDD and GND, the capacitor (*2 in application circuit) between two  
Hall sensor output and the capacitor (*3 in application circuit) between two ends  
of coil will increase system stability when motor is rotating.  
SP-ST1117ABC-A.007  
Version：A.007  
Page：4  
1234567

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