Electrical Engineering Stack Exchange
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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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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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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 projects1 using some standard communication (e.g. SPI or I2C) to communicate to as dedicated IC (e.g. STUSB4500,…
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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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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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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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Looking for an easier way to design a USB-C adapter with indicator LED

My company makes a USB-C/USB-PD 2.0 compliant charging device for use in airplanes. It runs off 28VDC, has a built-in DC-DC converter, and uses the TPS25740B for the USB-PD controller. See the picture below for a conceptual block diagram. Given the…
Perry Watson
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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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Using USB 4.0 port as USB 3.2 Gen2 x2 (10 Gbps per lane) with USB-C connector without PD-Controller

I'm designing a Motherboard with AMD Ryzen 7040 series APU, and I'm interested to use one of it's USBC ports (which support USB 4.0) only as USB 3.2 Gen2 x2 port. I know that USB-C connector could be connected to two lanes: Lane 0: (RX1+, RX1-,…
Firas Abd El Gani
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How do devices know how much power draw a usb cable can support?

This has been a little confusing. I have cables that can support 5V-3A for both USB 2 and 3. If I put together a type C to type A cable, the specs mandate the Default USB Type-C Current Rp resistor (56 kΩ). This should indicate a max current of .5A…
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Benefits to using USB-C Power Delivery for 5V/3A?

We are developing a low-power peripheral and have noticed that USB batteries seem to shut off when non-PD consumption drops below some threshold (e.g. 50 mA) for some period of time (e.g. a few seconds). However, when in PD mode the same batteries…
Jeff
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How can a charger charge both a phone and a laptop?

I have seen questions asking about usage but that's not my point here. I regularly use my Macbook USB-C charger to charge my iPhone. As far as I know, the phone requires a much lower output voltage (5V) compared to the laptop (20V). How does the…
user1936752
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Draw 20V 3A out of USB-C PD

I'm a newbie trying to figure out how to power a DIY project using USB-C PD. I'm building a project using about 120 RGB LEDS (consuming 60mA at 5V) and a Raspberry Pi 4 (max 3A at 5V). So I would expect a max load of 7.2A for the LEDs + 3A =…
Pierre
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Adding USB PD to my laptop

I would like to be able to charge my laptop via a USB-PD power source as seen in this article. I need to find out if my laptop input, which is rated at 19V 3.42A can handle the 20V provided by the usb c board. Is there any way to find out without…
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