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UC3871

更新时间: 2024-02-04 01:19:35
品牌 Logo 应用领域
德州仪器 - TI 驱动器
页数 文件大小 规格书
6页 468K
描述
Resonant Fluorescent Lamp Driver

UC3871 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

UC3871 数据手册

 浏览型号UC3871的Datasheet PDF文件第1页浏览型号UC3871的Datasheet PDF文件第2页浏览型号UC3871的Datasheet PDF文件第3页浏览型号UC3871的Datasheet PDF文件第4页浏览型号UC3871的Datasheet PDF文件第6页 
UC1871  
UC2871  
UC3871  
APPLICATION INFORMATION (cont.)  
UC3871 Oscillator Section  
Figure 2  
A unique protection feature incorporated in the UC3871  
is the Open Lamp Detect circuit. An open lamp interrupts  
the current feedback loop and causes very high secon-  
dary voltage. Operation in this mode will usually break-  
down the transformer’s insulation, causing permanent  
damage to the converter. The open lamp detect circuit,  
shown in Figure 3 senses the lamp current feedback sig-  
nal at the error amplifiers input, and shuts down the out-  
puts if insufficient signal is present. Soft-start circuitry  
limits initial turn-on currents and blanks the open lamp  
detect signal.  
requirements. A logic level enable pin shuts down the IC,  
allowing direct connection to the battery. During shut-  
down, the IC typically draws less than 1µA. The UC3871,  
operating from 4.5V to 20V, is compatible with almost all  
battery voltages used in portable computers. Under-volt-  
age lockout circuitry disables operation until sufficient  
supply voltage is available, and a 1% voltage reference  
insures accurate operation. Both inputs to the LCD sup-  
ply error amplifier are uncommitted, allowing positive or  
negative supply loop closure without additional circuitry.  
The LCD supply modulator also incorporates cycle-by-  
cycle current limiting for added protection.  
Other features are included to minimize external circuitry  
UC1871 Open Lamp Detect Circuitry  
Figure 3  
UNITRODE INTEGRATED CIRCUITS  
7 CONTINENTAL BLVD. MERRIMACK, NH 03054  
TEL. (603) 424-2410 FAX (603) 424-3460  
5

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