Snubber for HEXFRED?

pooge · 28th July 2005, 06:07 PM

Has anyone investigated the value of snubbers for a HEXFRED rectifier bridge? Assuming the purpose of going HEXFRED is to reduce rf hash, is snubbing still beneficial, or still a system dependent thing? I can't find any answer through a search.

jackinnj · 28th July 2005, 07:42 PM

According to IRF, the soft recovery means there is very little need for a RC snubber.

The junction capacitance is something like 1/10th that of an MUR860 -- i.e. about 10pF -- compared to 100pF (@30V).

pooge · 29th July 2005, 12:34 AM

I am aware of the supposed lack of RF with Hexfreds. I was wondering, though, if anyone had any experience otherwise, or if snubbing improved them even more.

Leolabs · 29th July 2005, 02:41 AM

Many have snubbing normal high speed diode but never seen any snubbing with HEXFRED.

28th July 2005, 06:07 PM	#1
pooge diyAudio Member Join Date: May 2003 Location: Northern Va.	Snubber for HEXFRED? Has anyone investigated the value of snubbers for a HEXFRED rectifier bridge? Assuming the purpose of going HEXFRED is to reduce rf hash, is snubbing still beneficial, or still a system dependent thing? I can't find any answer through a search.

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28th July 2005, 07:42 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	According to IRF, the soft recovery means there is very little need for a RC snubber. The junction capacitance is something like 1/10th that of an MUR860 -- i.e. about 10pF -- compared to 100pF (@30V).

29th July 2005, 12:34 AM	#3
pooge diyAudio Member Join Date: May 2003 Location: Northern Va.	I am aware of the supposed lack of RF with Hexfreds. I was wondering, though, if anyone had any experience otherwise, or if snubbing improved them even more.

29th July 2005, 02:41 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Many have snubbing normal high speed diode but never seen any snubbing with HEXFRED.

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