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UC3855A/B

更新时间： 2024-11-02 12:47:15
品牌 Logo 应用领域
德州仪器 - TI 功率因数校正控制器
页数 文件大小 规格书
32页 553K
描述
ADVANCED PFC/PWW COMBINATION CONTROLLER WITH TRAILING-EDGE/TRAILING-EDGE MODULATION

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UC3855A/B 数据手册

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SLUS608B − JANUARY 2005 REVISED JUNE 2005  
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FEATURES  
DESCRIPTION  
The UCC28521 and UCC28528 combination  
PFC/PWM controllers provide complete control  
functionality for any off-line power system  
requiring compliance with the IEC1000−3−2  
harmonic reduction requirements. By combining  
the control and drive signals for the PFC and the  
PWM stages into a single device, significant  
performance and cost benefits are gained.  
D
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Provides Control of PFC and PWM Power  
Stages In One Device  
Trailing-Edge PFC, Trailing-Edge PWM  
Modulation  
Built-In Sequencing of PFC and PWM  
Turn-On  
Based on the UCC28511, the new devices employ  
an average current mode control architecture with  
input voltage feedforward. The major difference of  
2-A Source and 3-A Sink Gate Drive for Both  
PFC and PWM Stages  
the UCC28521/28 is the trailing-edge  
/
Typical 16-ns Rise Time and 7-ns Fall Time  
into 1-nF Loads  
trailing-edge (TEM/TEM) modulation scheme for  
the PFC/PWM stages. The UCC28528 differs  
from the UCC28521 as its PWM stage does not  
turn off with the falling bulk voltage. The  
UCC28528 PWM was designed for low power  
auxiliary supplies.  
PFC Features  
− Average-Current-Mode Control for  
Continuous Conduction Mode Operation  
− Highly-Linear Multiplier for Near-Unity  
Power Factor  
− Input Voltage Feedforward Implementation  
− Improved Load Transient Response  
− Accurate Power Limiting  
These devices offer performance advantages  
over earlier generation combination controllers. A  
key PWM feature is programmable maximum duty  
cycle. For the PFC stage, the devices feature an  
improved multiplier and the use of  
a
− Zero Power Detect  
transconductance amplifier for enhanced  
transient response.  
PWM Features  
The core of the PFC section is in a three-input  
multiplier that generates the reference signal for  
the line current. The UCC28521/28 features a  
highly linearized multiplier circuit capable of  
producing a low distortion reference for the line  
current over the full range of line and load  
conditions. A low-offset, high-bandwidth current  
error amplifier ensures that the actual inductor  
current (sensed through a resistor in the return  
path) follows the multiplier output command  
signal. The output voltage error is processed  
through a transconductance voltage amplifier.  
− Peak-Current-Mode Control Operation  
− 1:1 PFC:PWM Frequency Option  
− Programmable maximum Duty Cycle Limit  
Up to 90%  
− Programmable Soft-Start  
APPLICATIONS  
D
D
High-Efficiency Server and DesktopSupplies  
High-Efficiency Telecom AC-DC Converter  
AVAILABLE APPLICATION OPTIONS  
PART NUMBER  
PWM STAGE  
APPLICATION  
UCC28521  
UCC28528  
PWM shuts off at 71% of the nomonal bulk voltage  
PWM does not turn off with falling bulk voltage  
ac−dc and main dc−dc converter  
ac−dc and standby converter  
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Copyright 2005, Texas Instruments Incorporated  
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ꢡ ꢥ ꢢ ꢡꢚ ꢛꢯ ꢝꢜ ꢠ ꢨꢨ ꢦꢠ ꢞ ꢠ ꢟ ꢥ ꢡ ꢥ ꢞ ꢢ ꢪ  
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