您好,我在使用DCP021212做电源隔离时,后级使用升压芯片LM5002MAX升压至48V,之后再用LM317HVT做线性稳压生成目标电压45V,在信号测试时有800KHZ的干扰型号,增加10uf和0.1uf的电容,仍然无法滤除。经查阅DCP021212的数据手册,其内部有800KHz的振荡器,怀疑该干扰与内部振荡器相关,请帮忙看看怎么样能把这个干扰去掉,谢谢!
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Any of the DCP02 series devices can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNC pin is pulled low, the DCP02 becomes disabled. The disable time depends upon the external loading. The internal disable function is implemented in 2 μs. Removal of the pull down causes the DCP02 to be enabled. Capacitive loading on the SYNC pin should be minimized (≤ 3 pF) in order to prevent a reduction in the oscillator frequency. The application report External Synchronization of the DCP01/02 Series of DC/DC Converters describes disable/enable control circuitry.
根据这个说明隔离电源不能正常工作。
针对您提到的在使用DCP021212、LM5002MAX以及LM317HVT过程中遇到的800KHZ干扰问题,以下是一些建议的解决步骤:
可能需要多次尝试和调整才能找到最佳的解决方案。希望这些建议能对您有所帮助!
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https://www.ti.com/cn/lit/an/zhct242/zhct242.pdf
官方针对于滤波器相关辅助设计文档。
https://e2echina.ti.com/blogs_/archives/b/webench/posts/52220
官方针对于滤波器的辅助设计工具。
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针对DCP021212芯片去掉后800kHz干扰消失的情况,如果希望通过对DCP021212周边电路做屏蔽来减少干扰,以下是一些建议:
通过以上措施,可以有效地减少DCP021212及其周边电路产生的800kHz干扰。需要注意的是,具体的屏蔽设计应根据实际情况进行调整和优化。