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Newbie level 5
Hello All,
I am designing a product which will take a DC supply input (10-40V), powering a buck-converter with 5V 4A output. The product will be powered from externally (probably from a 24V switch mode), but in some installations, the DC power cable could be fairly long, so I need to design the DC input to handle various EMI related problems.
My old design uses an SMAJ58CA TVS on the DC input, followed by a Toko ECM85 common mode choke.
I am worried that the SMAJ58CA will not withstand surge testing at +/-2kV, and whether I need additional protection on my DC input. Should I use a varistor or other component, alone or in combination with a TVS.
I have spent a great amount of time searching, but I have not found much regarding the design of DC power inputs.
Does anyone have suggestions for a design that will provide adequate protection against surge and burst, and also limit conducted emissions.
Any pointers to circuits, suggestions of components, appnotes etc. will be greatly appreciated.
/Mikkel Holm Olsen
I am designing a product which will take a DC supply input (10-40V), powering a buck-converter with 5V 4A output. The product will be powered from externally (probably from a 24V switch mode), but in some installations, the DC power cable could be fairly long, so I need to design the DC input to handle various EMI related problems.
My old design uses an SMAJ58CA TVS on the DC input, followed by a Toko ECM85 common mode choke.
I am worried that the SMAJ58CA will not withstand surge testing at +/-2kV, and whether I need additional protection on my DC input. Should I use a varistor or other component, alone or in combination with a TVS.
I have spent a great amount of time searching, but I have not found much regarding the design of DC power inputs.
Does anyone have suggestions for a design that will provide adequate protection against surge and burst, and also limit conducted emissions.
Any pointers to circuits, suggestions of components, appnotes etc. will be greatly appreciated.
/Mikkel Holm Olsen