Author Topic: Use USB PD capable power sources as custom power supply  (Read 988 times)

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Offline itamiTopic starter

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Use USB PD capable power sources as custom power supply
« on: July 11, 2019, 07:55:08 pm »
Hello,

I need to draw 15V from USB C Power Delivery capable devices such as power banks or chargers.

So I need a rather small tool or build which will send the request for 15V to the power supplying device.

This tool or build should be built to last and work with around 40W during long periods of time as I'm building a portable special lamp.

Thank you so much for your help!
 

Offline TimNJ

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Re: Use USB PD capable power sources as custom power supply
« Reply #1 on: July 12, 2019, 04:21:22 am »
I've been getting into the nitty gritty with USB PD for the last week or so (at work).

Tis quite a mess indeed. Not terrible once you've spent 50 hours reading the specs and supporting documents, but pretty confusing if you haven't.

Are you looking for an IC?

I noticed this one recently: STUSB4500 https://www.st.com/en/interfaces-and-transceivers/stusb4500.html

Seems pretty straightforward to use/implement if QFN package is okay for you. (Note: Most of the PD stuff is QFN or chip-scale because USB PD finds most of its use on highly integrated systems like smartphones, computers, etc.)

 

Offline viperidae

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Re: Use USB PD capable power sources as custom power supply
« Reply #2 on: July 12, 2019, 05:13:47 am »
I heard you can save half a cent off your bom if you combine the CC1 and CC2 resistors...
 

Offline ptricks

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Re: Use USB PD capable power sources as custom power supply
« Reply #3 on: July 12, 2019, 11:17:39 am »
I heard you can save half a cent off your bom if you combine the CC1 and CC2 resistors...

Raspberry Pi4  :palm:
 

Offline LapTop006

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Re: Use USB PD capable power sources as custom power supply
« Reply #4 on: July 14, 2019, 07:58:51 am »
The PD buddy sink should at least get you started.

Any current rev PD supply that outputs at least 30W should have a 15v output if negotiated.
 


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