I agree with Mr. Woodgate and I can add a little more information. UL 2367 is generally considered equivalent as Test Program 2 of Annex CC. Most NCBs will accept it as such and you should be able to place a statement in your report indicating the equivalency. Not all NCBs will necessarily accept the equivalence, but I have yet to run into an issue with integrated circuits approved under UL 2367.
Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer. From: John Woodgate <j...@woodjohn.uk> Sent: Monday, March 5, 2018 1:07 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] IEC60950-1 Limited Power Source via IC current limiter The standard says '...meets a suitable test program as given in Annex CC' [not Annex C]. It does not say 'shall meet the test program given in Annex CC'. As you know, the manufacturer is permitted to decide (and document) that a part meeting UL2367 is acceptable, and it would be up to a regulatory authority to challenge that. It seems unlikely that UL 2367 would be deficient, since this is a precaution against fire, which is a major concern of UL, of course. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.woodjohn.uk&data=04%7C01%7Cted.eckert%40microsoft.com%7C57ad0c33b883418c42a608d582dd12a3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636558808380524292%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwifQ%3D%3D%7C-2&sdata=Ul7TLxZq%2FHEl36YyaO1rCASJ4o%2B26Yn2z67Ld7rJ%2Fbo%3D&reserved=0> Rayleigh, Essex UK On 2018-03-05 20:11, Charlie Blackham wrote: All Client has designed a USB port with the DC power protected by a TI TPS2052B Current limiter: * Component details: www.ti.com/product/TPS2052B/description<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ti.com%2Fproduct%2FTPS2052B%2Fdescription&data=04%7C01%7Cted.eckert%40microsoft.com%7C57ad0c33b883418c42a608d582dd12a3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636558808380524292%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwifQ%3D%3D%7C-2&sdata=FUSXv3Bp93L9rC1gtGCcocla953sRv6etd8bPi9VVss%3D&reserved=0> * Component is UL recognised component under QVGS2.E169910 which is based on UL 2367 2.5 Limited power sources c) a regulating network, or an integrated circuit (IC) current limiter, limits the output in compliance with Table 2B, both with and without a simulated single fault (see 1.4.14) in the regulating network or the IC current limiter (open circuit or short circuit). A single fault between the input and output is not conducted if the IC current limiter meets a suitable test program as given in Annex CC; Annex CC requires appears to require quite extensive testing of the component, and I can't tell whether a component recognised against UL2367 would meet this or not. The issue, is that if they s/c the protection component, the output may no longer be LPS - we have provision to fit a suitable fuse on the board, but would prefer not to, so would be grateful for any advice Thanks Charlie Charlie Blackham Sulis Consultants Ltd Mead House Longwater Road Eversley RG27 0NW UK Tel: +44 (0)7946 624317 Email: char...@sulisconsultants.com<mailto:char...@sulisconsultants.com> Web: www.sulisconsultants.com<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Foutlook.hslive.net%2Fowa%2Fredir.aspx%3FC%3D02be3bf3e3a544d1bdf7b6c99fbd12f5%26URL%3Dhttp%253a%252f%252fwww.sulisconsultants.com%252f&data=04%7C01%7Cted.eckert%40microsoft.com%7C57ad0c33b883418c42a608d582dd12a3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636558808380524292%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwifQ%3D%3D%7C-2&sdata=8uI5K8JwRPvmrDSCwCXAuO017Eb9mMZHyy3RYxODfrM%3D&reserved=0> Registered in England and Wales, number 05466247 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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