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DerpyDino

Is It Possible: Type-C to 12V 6 Pin

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Posted · Original PosterOP

Just wondering if I could use a Type-C port as a weak 6 pin. Just an extra umph.
And before you ask, no, my laptop does not support Thunderbolt 3.

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no. USB is rated for 5A max, at 12V that means 60w. a PCIe 6pin is rated to do 75w, so it is not enough


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9 minutes ago, Jurrunio said:

no. USB is rated for 5A max, at 12V that means 60w. a PCIe 6pin is rated to do 75w, so it is not enough

USB-C PD can do 20V 5A, convert that to 12V and it should be able to deliver 75 watts. Still a very bad idea™.

 

Not to mention you actually need to do signalling to draw power from USB-C. It's not a good choice if you want just a dumb power delivery wire.


¯\_(ツ)_/¯

 

 

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If you don't need to always provide up to 75w the pci-e 6pin wants, then... with an 18w-30w external phone charger maybe. 

 

You get one of those chips that negotiates the voltage (to talk to the phone charger and switch between 5v/9v/12v/20v), a microcontroller (or comparator) and a mosfet and you make a board. 

 

When you plug usb c into your board, the chip asks the charger to switch from 5v to 12v. Your microcontroller monitors the incoming voltage and when it goes to 12v and stays there for more than a couple seconds, it enables the mosfet and sends that 12v to the 6pin connector to power whatever.

If you want to support 20v input, you'd have to add a 20v to 12v step-down dc-dc converter, or if you want to be extra fancy, you'd add a SEPIC (step-down/step-up dc-dc converter) which can take 5v ... 20v and produce 12v and then you may even skip the negotiation chip (though sending 30w at 5v through usb-c cable is unlikely and a really bad idea.

 

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