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UC2871J PDF预览

UC2871J

更新时间: 2024-11-20 23:38:55
品牌 Logo 应用领域
其他 - ETC 控制器
页数 文件大小 规格书
6页 491K
描述
Resonant-Mode SMPS Controller

UC2871J 数据手册

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UC1871  
UC2871  
UC3871  
Resonant Fluorescent Lamp Driver  
FEATURES  
DESCRIPTION  
1µA ICC when Disabled  
The UC1871 Family of IC’s is optimized for highly efficient fluorescent lamp  
control. An additional PWM controller is integrated on the IC for applications re-  
quiring an additional supply, as in LCD displays. When disabled the IC draws  
only 1µA, providing a true disconnect feature, which is optimum for battery  
powered systems. The switching frequency of all outputs are synchronized to  
the resonant frequency of the external passive network, which provides Zero  
Voltage Switching on the Push-Pull drivers.  
PWM Control for LCD Supply  
Zero Voltage Switched (ZVS) on  
Push-Pull Drivers  
Open Lamp Detect Circuitry  
4.5V to 20V Operation  
Soft-Start and open lamp detect circuitry have been incorporated to minimize  
component stress. An open lamp is detected on the completion of a soft-start  
cycle.  
Non-saturating Transformer  
Topology  
The Buck controller is optimized for smooth duty cycle control to 100%, while  
the flyback control ensures a maximum duty cycle of 95%.  
Smooth 100% Duty Cycle on  
Buck PWM and 0% to 95% on  
Flyback PWM  
Other features include a precision 1% reference, under voltage lockout, flyback  
current limit, and accurate minimum and maximum frequency control.  
BLOCK DIAGRAM  
UDG-92061-1  
Note: Pin numbers refer to DIL-18 and SOIC-18 packages only.  
10/94  
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