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
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
<http://www.ti.com/product/TPS2052B/description>
* 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>*
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