Why SMPS output inductors *not* coupled? - diyAudio
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Old 2nd January 2012, 10:50 AM   #1
Join Date: Jun 2011
Default Why SMPS output inductors *not* coupled?

The SPS30 SMPS is a +/-58V, 4A bridge or forward type SMPS with output inductors which are *not* coupled..........-the two outpout inductors are seen in the picture on page 1 of the datasheet (the two red coils)


I would think that the SPS30 was a current mode controlled SMPS, because current mode gives quicker transient response than voltage mode...and is just easier to control....so i assume that they chose current mode control

Page 3 , part 5 of the following clearly states that output inductors should be coupled with current mode converters.....


So does any reader know why the output inductors of SPS30 are not coupled?
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Old 2nd January 2012, 12:42 PM   #2
Join Date: Sep 2011
Wish to see EMI measurements for the same SMPS
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Old 2nd January 2012, 03:19 PM   #3
diyAudio Member
Join Date: Apr 2006
Location: Minnesota
The reference you gave says "coupled inductors are required for good cross regulation." Note that the regulation of the SPS30 is extremely poor, so obviously, they wouldn't care about coupled inductors.
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Old 3rd January 2012, 12:56 PM   #4
ssanmor is offline ssanmor  Spain
diyAudio Member
Join Date: Jan 2002
Location: Madrid
The photos you are seeing are not updated.
Check here:




Sonora Combo (integrated PSU):

Since three years ago or so all our SMPS have coupled ouptut inductors for better cross regulation.
In fact, SPSXX regulation is extremely good, why do you say that, sawreyrw?
This reminds me that we need to update some datasheet photographs! Thanks!
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Old 3rd January 2012, 04:02 PM   #5
diyAudio Member
Join Date: Apr 2006
Location: Minnesota
Duh, I misunderstood that the output is adjustable, and instead thought it was regulation. Sorry.
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