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UCC2884 PDF预览

UCC2884

更新时间: 2024-11-07 22:59:31
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

UCC2884 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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