Hello Matthew, I may be able to suggest an approach that may make the solution more cost effective. You can fight high-quality and properly certified USB-A output external power supplies that are manufactured in high enough volume that they are cost competitive. The cost of one of these power supplies with the added cost of a custom USB to jack plug will likely be less than the cost of a power supply with an attached custom cable.
I agree with John in regards to the selection of a power input connector. A barrel connector or micro-USB connector might be a better choice for a power input. USB to barrel jack cables are becoming quite common. You will need to consider whether to use USB-A or USB-C if you consider that approach. USB-C will limit the available power to 5 VDC, 3.0 A if there is no data connection to the load to negotiate higher power levels. This may affect what the available current should be used for fault testing on your customer’s device. Ted Eckert Microsoft Corporation The opinions experessed are my own and do not necessarily reflect those of my employer or the USB Implementers Forum. From: John Woodgate <j...@woodjohn.uk> Sent: Thursday, October 24, 2019 3:50 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [EXTERNAL] Re: [PSES] Power supply 60335 or 60950... Since it works with a phone, 62368-1 applies. I would not rely on 60950-1 because of the incidence of fires and electric shock. Bedrooms and nurseries are especially sensitive locations. Also, note that a jack plug is shorted when inserting or withdrawing. That is why the concentric connectors are used instead on portables and everything else. What happens if you plug the 5 V DC into a headphone socket, too? Not a good connector to use. If the client insists on what appears to be a very marginally safe course of action, I think you have to consider your professional position. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.woodjohn.uk&data=02%7C01%7Cted.eckert%40microsoft.com%7C96422da41e7b4a2eaf8508d758700817%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637075110512325495&sdata=Nhxvah8DlB8hG93oCawfgkehAl%2BAXs5WVeQFiYcyeLM%3D&reserved=0> Rayleigh, Essex UK On 2019-10-24 11:34, Matthew Wilson | GBE wrote: A client has a product, to be used by consumers typically in a bedroom or child's nursery, which has a microcontroller and is Wi-Fi enabled so it can present data to 'the cloud' and interact with a mobile phone 'app' to change some parameters on the device. We have been asked by the client with help in sourcing a power supply for it from Far East sources. They want a 'wall wart' type plug in device with a 2 metre lead to a jack plug. The product requires 5V DC up to 1A and has a jack socket DC input. Cost is, of course, a key driving factor but there are some very keen priced items available out of the FE. Ignoring 62368-1 for now, as there is still just over a year to go before this becomes mandatory and it appears the majority of 'cost effective' PSU manufacturers are not up-to-speed with this standard yet. They probably will wait till the last minute, or relying on the 'get-out' 4.1.1 clause in 62368-1. The question is what standard should the PSU meet? 60950-1 or 60335-1? 60950-1 is for IT equipment, 60335-1 is Household and similar electrical appliances. Both standards might apply. If it was a laptop power supply 60950-1 would even though the laptops are sold and used in the home. One potential PSU manufacturer, however, does claim both 60950-1 and 60335-1 for the same product. Is that possible with one design? I know this might also spark a debate about risks of FE manufacturers, conformity of production and so on like the excellent blog post here https://www.unit3compliance.co.uk/tag/power-supply/<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.unit3compliance.co.uk%2Ftag%2Fpower-supply%2F&data=02%7C01%7Cted.eckert%40microsoft.com%7C96422da41e7b4a2eaf8508d758700817%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637075110512335489&sdata=cQSPEDjqU4zbW5aE8LBqgUnOAORDuJsYzJHjrMiNuvU%3D&reserved=0> We have a presence on the ground in the FE to verify any manufacturers and all the three potential suppliers identified so far have listings on TUV or Intertek and have also provided conformity documentation supported by legitimate third parties. Any thoughts welcome. Thanks for reading. Regards, [cid:image003.png@01D58A44.33D16DB0][cid:image002.png@01D58A42.47780420] Disclaimer: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please delete it from your system, do not use or disclose the information in any way and notify the sender immediately. The contents of this message may contain personal views which are not the views of the company, unless specifically stated. GB Electronics (UK) Ltd is a company registered in England and Wales under number 06210991. Registered office: Ascot House Mulberry Close, Woods Way, Goring By Sea, West Sussex, BN12 4QY. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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