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UCC28950_13

更新时间： 2024-11-23 12:28:19
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德州仪器 - TI /
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Frequency Dithering With the UCC28950 and TLV3201

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UCC28950_13 数据手册

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Application Report  
SLUA646 – May 2012  
Frequency Dithering With the UCC28950 and TLV3201  
John Stevens  
High Performance Isolated Power  
ABSTRACT  
For some power-supplies, even after careful considerations throughout the design cycle  
the issue of Electro-Magnetic Compatibility (EMC) still remains. One final tool available to  
power designers is the use of Frequency Dithering to pass EMC compliance testing. This  
paper demonstrates a simple circuit that could be used when such a need arises.  
Contents  
Abstract....................................................................................................................................................1  
Introduction .............................................................................................................................................2  
Background .............................................................................................................................................2  
Example Using a small UCC28950 Control Card .................................................................................3  
Original Circuit...................................................................................................................................3  
Calculations.......................................................................................................................................4  
Dither Circuit Simulation....................................................................................................................5  
Dither Circuit Hardware.....................................................................................................................6  
Conclusions.............................................................................................................................................9  
Appendix..................................................................................................................................................9  
References.............................................................................................................................................10  
Figures  
Figure 1.  
Figure 2.  
Figure 3.  
Figure 4.  
Figure 5.  
Figure 6.  
Figure 7.  
Typical Dither Application Circuit with UCC28950 and TLV3201...................................2  
Two Output Signals of the UCC28950 without dithering added ....................................3  
TLV3201 Comparator Frequency-Dither Circuit in SPICE simulator.............................5  
Performance of Comparator Circuit in Simulation..........................................................6  
Hardware-tested output of Comparator Board................................................................7  
Two Output Signals of the UCC28950 with dithering added..........................................7  
Two Output Signals of the UCC28950 with dithering added (single capture =  
122kHz)................................................................................................................................8  
Two Output Signals of the UCC28950 with dithering added (single capture =  
144kHz)................................................................................................................................8  
Figure 8.  
Figure App 1. UCC28950 Small Control Card Schematic ................................................................9  
Figure App 2. UCC28950 Small Control Card Layout and Assembly .............................................9  
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