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UCC3884 PDF预览

UCC3884

更新时间: 2024-02-07 01:21:26
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
8页 269K
描述
Frequency Foldback Current Mode PWM Controller

UCC3884 技术参数

是否无铅: 含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:DIP
包装说明:PLASTIC, DIP-16针数:16
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01Factory Lead Time:1 week
风险等级:7.84Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:12 V
最小输入电压:10 V标称输入电压:11 V
JESD-30 代码:R-PDIP-T16JESD-609代码:e4
长度:19.3 mm功能数量:1
端子数量:16最高工作温度:70 °C
最低工作温度:最大输出电流:1 A
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装等效代码:DIP16,.3封装形状:RECTANGULAR
封装形式:IN-LINE峰值回流温度(摄氏度):NOT SPECIFIED
认证状态:Not Qualified座面最大高度:5.33 mm
子类别:Switching Regulator or Controllers表面贴装:NO
切换器配置:BUCK-BOOST最大切换频率:750 kHz
技术:BICMOS温度等级:COMMERCIAL
端子面层:Nickel/Palladium/Gold (Ni/Pd/Au)端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:7.62 mm
Base Number Matches:1

UCC3884 数据手册

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application  
INFO  
UCC1884  
UCC2884  
available  
UCC3884  
PRELIMINARY  
Frequency Foldback Current Mode PWM Controller  
FEATURES  
DESCRIPTION  
Frequency Foldback Reduces  
Operating Frequency Under Fault  
Conditions  
The UCC3884 is a high performance current mode PWM controller in-  
tended for single ended switch mode power supplies. The chip implements  
a frequency foldback scheme that decreases the oscillator frequency as  
the output voltage falls below a programmed value. This technique de-  
creases the average output current sourced into a low impedance load  
which can occur during an output short circuit or overload condition. Ex-  
cessive short circuit current is more prevalent in high frequency converters  
where the propagation delay and switch turn-off time forces a minimum at-  
tainable duty cycle. An accurate volt-second clamp limits the duty cycle  
during line or load transient conditions which could otherwise saturate the  
transformer. The volt-second clamp may also be used with an external  
overvoltage protection circuit to handle fault conditions such as current  
sense disconnect or current transformer saturation. The frequency  
foldback, volt-second clamp, cycle-by-cycle current limit, and overcurrent  
shutdown provide a rich set of protection features for use in peak current  
mode pulse width modulators.  
Accurate Programmable Volt-Second  
Clamp  
Programmable Maximum Duty Cycle  
Clamp  
Oscillator Synchronization  
Overcurrent Protection  
Shutdown with Full Soft Start  
Wide Gain Bandwidth Amplifier  
(GBW > 2.5MHz)  
Current Mode Operation  
Precision 5V Reference  
BLOCK DIAGRAM  
UDG-96026-1  
SLUS160A - AUGUST 1999  

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