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Noise filter for DC-DC boost converter
Noise filter for DC-DC boost converter
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Old 22nd June 2019, 08:25 AM   #1
asiadiy is offline asiadiy
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Noise filter for DC-DC boost converter
Default Noise filter for DC-DC boost converter

I am using a DC to DC converter, 12v input, 48V output. I would like to be sure the output is clean before going into my new 3E amp board.


Any recommendations for a 15A (700watt) filter that can operate at 48VDC? Seems difficult to source on that can accept 48V.


Thanks
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Old 22nd June 2019, 09:10 PM   #2
trobbins is offline trobbins  Australia
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Perhaps if you confirm that there is noise on the 48V line (with your intended load), and what it is?

Last edited by trobbins; 22nd June 2019 at 09:13 PM.
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Old 23rd June 2019, 05:32 AM   #3
kodabmx is offline kodabmx  Canada
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Noise filter for DC-DC boost converter
You can probably find a suitable inductor...
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Old 23rd June 2019, 07:36 AM   #4
asiadiy is offline asiadiy
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Noise filter for DC-DC boost converter
I'm assuming my cheap Ebay DC-DC boost switching type converter will not be very clean. Maybe too pessimistic?

I just bought a filter, rated 50v 15a. Maybe good insurance?

It has 3 inductors and 2 caps. I plan to wire this between the boost converter and amplifier.

Pics attached
Attached Images
File Type: png murata bnx.png (25.0 KB, 127 views)
File Type: png murata schematic.png (28.9 KB, 128 views)
File Type: png converter.png (714.8 KB, 123 views)
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Old 23rd June 2019, 08:56 AM   #5
sq225917 is offline sq225917  United Kingdom
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I think we can safely assume that all that silicone sealant on your dc converter will mop up any noise...

The murata looks like a good choice.
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Old 23rd June 2019, 09:04 AM   #6
asiadiy is offline asiadiy
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Noise filter for DC-DC boost converter
Hi Mike, here is the Murata filter link:
1PCS BNX005-01 EncapsulationIP6, | eBay

Mfgr:
https://www.murata.com/en-us/api/pdf...rtno=BNX005-01
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Old 24th June 2019, 08:22 AM   #7
CallMeMike is offline CallMeMike  United Kingdom
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@Bruce Many thanks for your input...
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