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UC3852: 关于UC3852的外围电路设计

Part Number: UC3852
Other Parts Discussed in Thread: UCC28019A

请问UC3852的推荐工作频率在什么范围内?在设计反馈电路时,是否可以将VFB直接接地而将通过外部电路得到的反馈信号直接接到COMP引脚?是否还有类似于UC3852的其他可以限频的更加新的PFC芯片?