USB Type-C – Power Negotiation Issues
Hello this is my first thread here.
At this time I am developing a Proof of Concept (POC) that is an adapter for Type-C devices..
I need direction on which PARTS: connectors and resisters I would need to complete the build.
I am taking a preexisting device that uses a designated 3.7V 550mAH LIon battery for power.
I want to cut the wires and create an adapter, so I can use alternative power sources via USB Type-C connectors.
The first Goal is that the adapter will receive power from a Samsung S8 mobile device.
10W to power 1.3 R.
3.7V and 550 mAH LIon battery existing power source; to be removed.
The device should receive 3.5V to 3.8V range and can not receive more than 4V.
I am unsure of the Battery Discharge /Pulse Amp rating? But I am working on it.
1) Can an USB-C connector control a variable Voltage under 5V or is it only preset voltages 3V or 5V?
I read the paper that mentioned 3V and 5V, with max of 15W=5V x 3A, before having to switch to PD, but it didn't elaborate on if something like 3.6V is possible from the Host.
I guess, If the phone sends 5V I could put the correct resistor in there to step it down if needed.
2) Which correct Type-C connector, Part ,chip resister do I need to negotiate with the phone or any other Type-C device to deliver 10W?
I am unsure at this time what the Discharge/Pulse Amps are for a Samsung S8 Lion poly phone battery or any other for that manner.
I have heard that it has provided 7.5W to power a peripheral device, but that was all that was demanded. don;t know if that's a max or not.
If I have to put an inductor, booster, or capacitor in the adapter I guess I will.
3) Is 10 Watts, 10 Watts no matter how you slice it? e.g 5V x 2A=!0W or 3.5V x 2.69A=10W.
Just wondering if it would fry the circuit?
That's it for now, I appreciate any help I can get.
Getting the correct chip connector setup is critical. Thanks.
1. Per the USB Type-C Specification, 5V must be presented initially on the Type-C connection. After a Type-C implicit contract is established, USB PD negotiations may begin.
2. I would recommend purchasing some of our EVMs and seeing which one would meet your needs. You can refer to the TPS25810 if only 10W is needed.
3. The minimum USB Type-C voltage is 5V. So 10W on an implicit Type-C contract would be 5V @ 2A. for a PD contract, however, it could be 10V @ 1A.
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