Author Topic: Extremely simple USB-C power source  (Read 404 times)

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Offline SaimounTopic starter

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Extremely simple USB-C power source
« on: May 17, 2024, 09:55:28 am »
Hi

Is it possible to have a simple USB Type-C port on the host/source side without a USB PD chip? (for example turning on/off Vbus with transistors)
All the port has to do is to transmit power, no data.

Thank you :)
 

Offline SaimounTopic starter

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Re: Extremely simple USB-C power source
« Reply #1 on: May 17, 2024, 10:44:21 am »
Would something like the attached circuit work for example?

I understand connecting the CC pins together breaks the standard - but since all USB-C cables only connect one of the two it should work?
 

Online wasedadoc

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Re: Extremely simple USB-C power source
« Reply #2 on: May 17, 2024, 11:08:36 am »
Why do you want/need to switch the power?  Just wire 5v and 0v to the appropriate pins of the socket?
 

Offline tszaboo

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Re: Extremely simple USB-C power source
« Reply #3 on: May 17, 2024, 11:50:56 am »
You don't have to support power delivery for a Type-C port.
I think for a 5V device the only requirements are to have two pulldown resistors on the CC1/CC2, so if you have a simple "OR" detection on these two lines, you can control a current limited power switch with that. There are dedicated USB power controllers as well.
 

Offline SaimounTopic starter

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Re: Extremely simple USB-C power source
« Reply #4 on: May 18, 2024, 09:18:42 am »
Why do you want/need to switch the power?  Just wire 5v and 0v to the appropriate pins of the socket?
If you do that and two hosts are plugged into each other them boom >:D
Turning on the Vbus only when a device is connected is part of the spec :)
 


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