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UC3871J PDF预览

UC3871J

更新时间: 2024-02-22 06:09:42
品牌 Logo 应用领域
其他 - ETC /
页数 文件大小 规格书
6页 491K
描述
Industrial Control IC

UC3871J 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:QLCC
包装说明:GREEN, PLASTIC, LCC-20针数:20
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.65
Is Samacsys:N模拟集成电路 - 其他类型:FLUORESCENT LIGHT CONTROLLER
控制模式:CURRENT-MODE控制技术:RESONANT CONTROL
最大输入电压:20 V最小输入电压:4.5 V
标称输入电压:5 VJESD-30 代码:S-PQCC-J20
长度:8.965 mm功能数量:1
端子数量:20最高工作温度:70 °C
最低工作温度:最大输出电流:0.1 A
封装主体材料:PLASTIC/EPOXY封装代码:QCCJ
封装等效代码:LDCC20,.4SQ封装形状:SQUARE
封装形式:CHIP CARRIER峰值回流温度(摄氏度):NOT SPECIFIED
认证状态:Not Qualified座面最大高度:4.57 mm
子类别:Switching Regulator or Controllers表面贴装:YES
切换器配置:PUSH-PULL最大切换频率:78 kHz
技术:BIPOLAR温度等级:COMMERCIAL
端子形式:J BEND端子节距:1.27 mm
端子位置:QUAD处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:8.965 mmBase Number Matches:1

UC3871J 数据手册

 浏览型号UC3871J的Datasheet PDF文件第1页浏览型号UC3871J的Datasheet PDF文件第2页浏览型号UC3871J的Datasheet PDF文件第3页浏览型号UC3871J的Datasheet PDF文件第5页浏览型号UC3871J的Datasheet PDF文件第6页 
UC1871  
UC2871  
UC3871  
TYPICAL APPLICATION  
Figure 1  
APPLICATION INFORMATION  
Figure 1 shows a complete application circuit using the  
UC3871 Resonant Fluorescent lamp and LCD driver.  
The IC provides all drive, control and housekeeping func-  
tions to implement CCFL and LCD converters. The buck  
output voltage (transformer center-tap) provides the zero  
crossing and synchronization signal. The LCD supply  
modulator is also synchronized to the resonant tank.  
comparator senses the primary center-tap voltage, gen-  
erating a synchronization pulse when the resonant wave-  
form falls to zero. The actual threshold is 0.5 volts,  
providing a small amount of anticipation to offset propa-  
gation delay.  
The synchronization pulse width is the time that the 4mA  
current sink takes to discharge the timing capacitor to 0.1  
volts. This pulse width sets the LCD supply modulator  
minimum off time, and also limits the minimum linear  
control range of the buck modulator. The 200µA current  
source charges the capacitor to a maximum of 3 volts. A  
comparator blanks the zero detect signal until the capaci-  
tor voltage exceeds 1 volt, preventing multiple synchroni-  
zation pulse generation and setting the maximum  
frequency. If the capacitor voltage reaches 3 volts (a zero  
detection has not occurred) an internal clock pulse is  
generated to limit the minimum frequency.  
The buck modulator drives a P-channel MOSFET di-  
rectly, and operates over a 0-100% duty-cycle range. The  
modulation range includes 100%, allowing operation with  
minimal headroom. The LCD supply modulator also di-  
rectly drives a P-channel MOSFET, but it’s duty-cycle is  
limited to 95% to prevent flyback supply foldback.  
The oscillator and synchronization circuitry are shown in  
Figure 2. The oscillator is designed to synchronize over a  
3:1 frequency range. In an actual application however,  
the frequency range is only about 1.5:1. A zero detect  
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