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UCC1889N PDF预览

UCC1889N

更新时间： 2024-11-29 05:41:27
品牌 Logo 应用领域
德州仪器 - TI 信息通信管理光电二极管
页数 文件大小 规格书
7页 411K
描述
IC,SMPS CONTROLLER,VOLTAGE-MODE,BICMOS,DIP,8PIN,PLASTIC

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中文翻译

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UCC1889N 技术参数

生命周期：Obsolete包装说明：DIP, DIP8,.3
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.84
模拟集成电路 - 其他类型：BATTERY CHARGE CONTROLLER控制模式：VOLTAGE-MODE
JESD-30 代码：R-PDIP-T8端子数量：8
最高工作温度：125 °C最低工作温度：-55 °C
最大输出电流：0.1 A封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装等效代码：DIP8,.3
封装形状：RECTANGULAR封装形式：IN-LINE
认证状态：Not Qualified子类别：Switching Regulator or Controllers
表面贴装：NO最大切换频率：150 kHz
技术：BICMOS温度等级：MILITARY
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUALBase Number Matches：1

UCC1889N 数据手册

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UCC1889  
UCC2889  
UCC3889  
Off-line Power Supply Controller  
DESCRIPTION  
FEATURES  
•
Transformerless Off-line  
Applications  
The UCC1889 controller is optimized for use as an off-line, low power, low voltage,  
regulated bias supply. The unique circuit topology utilized in this device can be  
visualized as two cascaded flyback converters, each operating in the discontinu-  
ous mode, and both driven from a single external power switch. The significant  
benefit of this approach is the ability to achieve voltage conversion ratios of 400V  
to 12V with no transformer and low internal losses.  
•
•
•
•
Ideal Primary-side Bias Supply  
Efficient BiCMOS Design  
Wide Input Range  
The control algorithm utilized by the UCC1889 is to force the switch on time to be  
inversely proportional to the input line voltage while the switch off time is made in-  
versely proportional to the output voltage. This action is automatically controlled by  
an internal feedback loop and reference. The cascaded configuration allows a volt-  
age conversion from 400V to 12V to be achieved with a switch duty cycle greater  
than 10%. This topology also offers inherent short circuit protection since as the  
output voltage falls to zero, the switch off time approaches infinity.  
Fixed or Adjustable  
Low Voltage Output  
•
•
•
Uses Low Cost SMD Inductors  
Short Circuit Protected  
Optional Isolation Capability  
The output voltage can be easily set to 12V or 18V. Moreover, it can be pro-  
grammed for other output voltages less than 18V with a few additional compo-  
nents. An isolated version can be achieved with this topology as described further  
in Unitrode Application Note U-149.  
OPERATION  
With reference to the application diagram below, when input voltage is first applied,  
the RON current into TON is directed to VCC where it charges the external capacitor,  
C3, connected to VCC. As voltage builds on VCC, an internal undervoltage lockout  
holds the circuit off and the output at DRIVE low until VCC reaches 8.4V. At this  
time, DRIVE goes high turning on the power switch, Q1, and redirecting the current  
into TON to the timing capacitor, CT. CT charges to a fixed threshold with a current  
ICHG=0.8 • (VIN - 4.5V)/RON. Since DRIVE will only be high for as long as CT  
charges, the power switch on time will be inversely proportional to line voltage.  
This provides a constant line voltage-switch on time product.  
TYPICAL APPLICATION  
UDG-93060-1  
Note: This device incorporates patented technology used under license from Lambda Electronics, Inc.  
SLUS158A - FEBRUARY 1995 - REVISED FEBRUARY 2003  
1234567

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