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UCC2884QTR PDF预览

UCC2884QTR

更新时间: 2024-09-20 20:40:43
品牌 Logo 应用领域
德州仪器 - TI 信息通信管理开关
页数 文件大小 规格书
8页 267K
描述
1A SWITCHING CONTROLLER, 750kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20

UCC2884QTR 技术参数

生命周期:Obsolete零件包装代码:QLCC
包装说明:QCCN,针数:20
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.77
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:S-PQCC-N20功能数量:1
端子数量:20最高工作温度:85 °C
最低工作温度:-40 °C最大输出电流:1 A
封装主体材料:PLASTIC/EPOXY封装代码:QCCN
封装形状:SQUARE封装形式:CHIP CARRIER
认证状态:Not Qualified表面贴装:YES
切换器配置:BUCK-BOOST最大切换频率:750 kHz
技术:BICMOS温度等级:INDUSTRIAL
端子形式:NO LEAD端子位置:QUAD
Base Number Matches:1

UCC2884QTR 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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