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UCC3884QTR PDF预览

UCC3884QTR

更新时间： 2024-11-23 18:38:03
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德州仪器 - TI /
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UCC3884QTR 数据手册

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UCC2884  
UCC3884  
www.ti.com............................................................................................................................................. SLUS160C–AUGUST 1999–REVISED NOVEMBER 2008  
Frequency Foldback Current Mode PWM Controller  
1
FEATURES  
DESCRIPTION  
•
Frequency Foldback Reduces Operating  
Frequency Under Fault Conditions  
The UCC3884 is a high performance current mode  
PWM controller intended for single ended switch  
mode power supplies. The chip implements  
•
•
•
•
•
•
Accurate Programmable Volt-Second Clamp  
Programmable Maximum Duty Cycle Clamp  
Oscillator Synchronization  
a
frequency foldback scheme that decreases the  
oscillator frequency as the output voltage falls below  
a programmed value. This technique decreases the  
average output current sourced into a low impedance  
load which can occur during an output short circuit or  
overload condition. Excessive short circuit current is  
more prevalent in high frequency converters where  
the propagation delay and switch turn-off time forces  
Overcurrent Protection  
Shutdown With Full Soft Start  
Wide Gain Bandwidth Amplifier (GBW > 2.5  
MHz)  
•
•
Current Mode Operation  
Precision 5-V Reference  
a
minimum attainable 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.  
OSCILLATOR SYNCHRONIZATION  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 1999–2008, Texas Instruments Incorporated  
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