Questions tagged [usb-pd]

The USB-PD tag relates to the Power Delivery extension of the USB specification. USB-PD is capable of supporting up to 100 W of power after negotiation between spec-compliant USB PHYs.

The USB-PD extension specification relates to the USB specification. Basically it says that devices may negotiate for up to 100 W of power to be delivered to them from the host.

A few articles about this capability:

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Do all USB Type C cables support full power delivery?

USB Power Delivery is able to work over USB Type A/B cables which are specifically designed to support it. Since the USB Type C was designed much later, I am curious: Do all USB Type C cables support USB PD by default? And do they support a certain…
William Entriken
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Why are there no 12V/5A USB PD chargers/batteries?

Any 100W USB PD 3.0 system must support 20V/5A charging. Naively I assumed that therefore they should support 5A at any of the lower voltage rails! But for some unclear reason, I cannot find any PD based system that will output 5A at less than 20V.…
Rafael
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How to get 20 V from a USB-C charger?

I want to power my DIY stuff with a MacBook Pro USB C charger. The label on a charger says that it can provide three different power profiles: 20.2V - 4.3A 9V - 3A 5.2V - 2.4A There is a ton of information about what USB-C power distribution is…
George
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Why do I need a USB-C controller for PD?

I am trying to design the SOURCE part. If I want to be able to supply 5V at 3A to a load using USB-C PD then I assume all I have to do is the following: This is according to the latest USB-C standard for PD. Why do I need a USB-C controller if this…
JoeyB
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Does USB-C Power Delivery require both CC pins or D+/D- pins?

I'm working on a project to update a device to use a Li-Ion battery rather than non-rechargables. I would like it to be charged via USB-C. I have previously used IP2721 to handle the power delivery negotiation but have recently found this chip (…
Chris
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USB3 pass-through on a board - dealing with the USB-PD situation?

We have a board where the customer wants to be able to pass USB through from one USB-C connector (on the back) to another (on the front) to make plugging in the odd peripheral easier - sounds easy right? But, given the way USB has evolved now I…
John U
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What does this connector symbol mean in a charger schematic?

Could somebody explain what symbol JP1 means? iIt is presented in the schematic of the datasheet of a USB-C PD controller. I think JP1 symbol is kind of two state connector (normally closed and normally open) used for testing given that in the…
imt_blake
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What is this USB-C connector without CC pins intended for?

I have long searched for a easy-to-use USB-C connector, meaning only the lines I need are actually present as pins. For this reason I stumbled upon that connector. What is the purpose of this USB-C receptacle?…
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Implementing USB-C PD PHY directly into micro-controller

I want to explore more USB-C PD , in particular Programmable Power Supply (PPS), to supply my projects with power. There are some good projects 1 using some standard communication (e.g. SPI or I2C) to communicate to as dedicated IC (e.g. STUSB4500 ,…
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TP4056 Lithium-ion Charger Module with USB-C PD

I have a USB-C version of one of these TP4056 Lithium-ion charger modules. It works well so far from limited testing (the battery I've used has its own protection), but there's a lot more to test. The problem I'm having is that it works perfectly…
Aubs
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Home automation: Turn on 5V DC 200mA power when cat approaches

Junior's got a drinking problem. Junior's my cat, and he only drinks from running water. Pet water fountain pumps are USB power driven (good), but noisy (30db w/ wavering pitch almost, not quite, at C3) and the noise is irritating. So, I want a…
K7AAY
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What prevents old (low current) USB cables from catching fire if used to Quick Charge modern devices (at high-current)?

Let's say I have A very old Micro-USB cable. It's USB 2.0 and rated for a max current of 5V, 0.5A (2.5W). A modern, power-thirsty, quick-charging tablet that charges over micro-USB at a max of 100W . A modern, QC, power-supply that outputs a max of…
Michael Altfield
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USB Power Delivery over Type-A connector

I have a Xiaomi phone that came with a 33W charger. It says it does 5, 9, 11, 12 and 20 volt, so looks like a fairly normal USB-PD charger. Except, it has a type-A socket and came with an A-to-C cable! How is that possible? It seems to be doing…
Tor Klingberg
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USB-C on/off switch design that is PD compatible (off similar to cold-plugging)

Setup I am running 4 meters of 12V LED strip lights off of a USB-C power bank using a HUSB238. This results in ~24 W (2 A @ 12 V) and works fine for my use case. To modulate the intensity, I have an ATtiny85 with a voltage regulator (currently…
Jeff Prouty
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STUSB4500: Unable to negotiate USB-C PD voltage higher than 5V

for my project, I have decided to use STUSB4500 for negotiating 20V for powering external remotely controlled LED lighting. My circuit design comes from the minimum implementation in the datasheet, but I've decided to get rid of the p-Mosfet as I…
Viktor Stískala
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