DCM & CCM DC-DC flyback converter help plz - Page 2

darkfenriz · 10:30 AM

PI TopSwitches are current mode aren't they?

Edit: have checked, no they're not, only current limiting is implemented.
This is a good point here.

dtproff · 29th January 2012, 01:07 PM

No... Voltage domain control only.

Sorry didn't see the last part of your post.

dtproff · 29th January 2012, 01:12 PM

I use a lot of controller in the 10-65W range for flybacks. In general I never use an integrated controller/FET. First it dilutes my purchasing power, and second if I have an efficiency/EMI problem then I can change out the FET (better FET in the first instance, cheaper FET in the second).

And my last reason for not using PI is that they do not own their own foundry. This puts them at a competitive disadvantage to those that do own their own foundry. At my volumes this is an issue.

Thanks for letting me get my $0.02 in.

Tony

Aucosticraft · 10th March 2012, 12:52 PM

Quote:

Originally Posted by dtproff

As you decrease the load the Flyback will naturally move from CCM to DCM.

I have included my sample calculator for flybacks

Tony

Thanks For the sheet

29th January 2012, 10:21 AM	#11
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	PI TopSwitches are current mode aren't they? Edit: have checked, no they're not, only current limiting is implemented. This is a good point here. Last edited by darkfenriz; 29th January 2012 at 10:30 AM.

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29th January 2012, 01:07 PM	#12
dtproff diyAudio Member Join Date: Oct 2008 Location: Plano, TX, USA	No... Voltage domain control only. Sorry didn't see the last part of your post.

29th January 2012, 01:12 PM	#13
dtproff diyAudio Member Join Date: Oct 2008 Location: Plano, TX, USA	I use a lot of controller in the 10-65W range for flybacks. In general I never use an integrated controller/FET. First it dilutes my purchasing power, and second if I have an efficiency/EMI problem then I can change out the FET (better FET in the first instance, cheaper FET in the second). And my last reason for not using PI is that they do not own their own foundry. This puts them at a competitive disadvantage to those that do own their own foundry. At my volumes this is an issue. Thanks for letting me get my $0.02 in. Tony

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