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UCC1888DTR PDF预览

UCC1888DTR

更新时间： 2024-11-28 13:15:07
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
6页 301K
描述
IC IC,SMPS CONTROLLER,VOLTAGE-MODE,BICMOS,SOP,8PIN,PLASTIC, Switching Regulator or Controller

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中文翻译

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UCC1888DTR 技术参数

生命周期：Obsolete包装说明：SOP, SOP8,.25
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-PDSO-G8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：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
认证状态：Not Qualified子类别：Switching Regulator or Controllers
表面贴装：YES最大切换频率：150 kHz
技术：BICMOS温度等级：MILITARY
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUALBase Number Matches：1

UCC1888DTR 数据手册

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UCC1888  
UCC2888  
UCC3888  
Off-line Power Supply Controller  
DESCRIPTION  
FEATURES  
•
•
•
•
Transformerless Off-line  
Power Supply  
The UCC3888 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, both driven from a single external power switch. The significant benefit  
of this approach is the ability to achieve voltage conversion ratios as high as 400V  
to 2.7V with no transformer and low internal losses.  
Wide 100VDC to 400VDC  
Allowable Input Range  
Fixed 5VDC or Adjustable  
Low Voltage Output  
The control algorithm utilized by the UCC3888 sets the switch on time inversely  
proportional to the input line voltage and sets the switch off time inversely propor-  
tional to the output voltage. This action is automatically controlled by an internal  
feedback loop and reference. The cascaded configuration allows a voltage conver-  
sion from 400V to 2.7V to be achieved with a switch duty cycle of 7.6%. This topol-  
ogy also offers inherent short circuit protection since as the output voltage falls to  
zero, the switch off time approaches infinity.  
Output Sinks 200mA, Sources  
150mA Into a MOSFET Gate  
•
•
•
Uses Low Cost SMD Inductors  
Short Circuit Protected  
Optional Isolation Capability  
The output voltage is set internally to 5V. It can be programmed for other output  
voltages with two external resistors. 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 current through RON into TON is directed to VCC where it charges the external  
capacitor, C3, connected to VCC. As voltage builds on VCC, an internal undervol-  
tage 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 redirect-  
ing 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-96013  
Note: This device incorporates patented technology used under license from Lambda Electronics, Inc.  
3/97  
123456

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