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USB Type C PD Minimum Requirement

I have been wanting to veer away from older USB connectors and start using USB Type-C receptacles in future designs but the standard is quite confusing as a hobbyist. Searching the internet I see that ...
SolveEtCoagula07's user avatar
1 vote
1 answer
110 views

Help identifying chip in Huawei motherboard

Can you help me identify this chip? It looks like a SOT23-5 chip, it seems to be part of the USB-C Power Delivery. The laptop doesn’t power up because this chip seems to be part of the negotiation ...
L. Ricardo's user avatar
2 votes
2 answers
106 views

PDN with ferrite bead

One objective in PCB design is to keep PDN impedance lower than a certain value upto a frequency range, to ensure power integrity. I believe that maintaining power integrity means that PDN is able to ...
gyuunyuu's user avatar
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1 answer
76 views

Power distribution on a board with large number of voltage rails

Complex FPGA boards nowadays can have a large number of voltage rails like 5V, 3.3V, 2.5V, 1.8V, 1.2V and seprate analogue and digital supplies and then separate voltage rails for specific components ...
quantum231's user avatar
1 vote
0 answers
60 views

Power plane vs polygon pours

This question is being asked from perspective of Altium but applies to other PCB CAD programs as well. So we can have two type of dedicated copper areas for power on a PCB plane. One is a polygon pour....
quantum231's user avatar
4 votes
2 answers
147 views

Safety of dual male / single female Y cords

On Amazon there are Y cords with two male plugs and a single, higher current female socket. These are advertised as providing a way to power equipment with higher current demands than a single outlet ...
711's user avatar
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-1 votes
2 answers
226 views

USB-PD over USB-A

I have a power adapter from Samsung which supports an output of 5.0V 2.0A or 9.0V 1.67A. The adapter has a USB-A output and fast charges my S10 at 9V. Can USB-A be used for USB-PD? I also have a ...
Aditya Desai's user avatar
1 vote
0 answers
46 views

Why does Backside Power Distribution work for high speed CPUs?

Several upcoming or future CMOS process nodes are said to offer some kind of backside power delivery for Silicon CMOS transistors, so the precious area in the lower metal layers is freed up for signal ...
tobalt's user avatar
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1 answer
155 views

Setting SNK POD values for MAX77958

In the datasheet for the max77958 it states: ...
topher217's user avatar
  • 223
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0 answers
370 views

For USB-C, is it compliant to use the SBU pins for low voltage serial data transfer during 20 V Power Delivery?

I'd like to use a PD controller to allow for 20 V, 60 W+ to enter the sink system, but I'd also like to use the sideband pins (or other pins) to send some 3.3 V TTL serial data to the host side in the ...
joe_electric's user avatar
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0 answers
84 views

USB connection and reconnection issue

I have upgraded a design with a USB2412 to a design with a USB2514Bi chip to have more USB ports available. During testing we discovered the device works like expected when we connect it to a USB A ...
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Is there any benefit of the power plane capacitance to PDN?

PWR and GND plane make a capacitor with the dielectic in between them. The closer the two planes are physically, the higher the electrical coupling and thus the capacitance between them. Power ...
quantum231's user avatar
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1 answer
206 views

How to connect a 24VDC LED light strip and 5V/500mA microcontroller board to power with a single USB-C cable?

I have a 24VDC LED light strip and 5v/500mA microcontroller board that I would like to connect to power with a single USB-C cable. At the moment they connect to their own power sources and the light ...
Joshua Wilson's user avatar
7 votes
2 answers
973 views

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 ...
3244611user's user avatar
1 vote
1 answer
69 views

I'm having issues with multiple regulator power delivery design

The device I'm designing consists of an STM32F405, a few 3V peripherals, and a few 5V peripherals. The device is is powered off of a 12700 Li-ion battery. The first regulator is a buck/boost that is ...
Erric DiFilippo's user avatar
3 votes
2 answers
528 views

Crossing USB Type-C wires on debug probe

I plan to make debug probe that allows me analyze traffic on USB Type-C cable. I want to make blue middle board from the following schametic: From my point of view right port of the my board is ...
Misaz's user avatar
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1 vote
1 answer
56 views

FTDI Debugger Load Switching

I’m developing a new version of a custom debugger board for my project. The debug target is a solar powered device, which means sometimes I want to power it from the host (debugger) and sometimes I ...
Jakub Nagy's user avatar
2 votes
1 answer
75 views

Can USB-C PowerDelivery be restricted to manufacturers devices? [closed]

I have recently searched for a new monitor. I'd like to have a single-cable setup via USB-C, so I need a monitor that supports PowerDelivery. I found a good match (from HP) but looking into reviews on ...
Lens's user avatar
  • 23
1 vote
1 answer
469 views

Do devices not tolerating swapping live and neutral exist?

Multiple types of domestic power sockets around the world (including the ones in my country) do not distinguish between live and neutral even when ground is present. I am shopping for an AC-DC PSU ...
DarioP's user avatar
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0 answers
52 views

DC powered USB wall faceplate

Looking to make a USB Power Delivery faceplate to install within a wall. Looking to feed the faceplate from a 48V DC Bus that I have available. Looking to get ideally x2 USB C connectors and x2 USB A ...
Brandon Kellett's user avatar
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1 answer
121 views

Can Altium PDN Analyser Calculate AC Impedance?

It looks like the new PDN Analyser v2.0 tool in Altium v21 can only calculate "steady-state" DC PDN impedances, which in itself is not that useful: There is no such thing as a steady-state ...
pfabri's user avatar
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1 vote
0 answers
694 views

USB-C power delivery, how to power 20V pd device from "dirty" +20V source?

I want to charge my laptop from a solar pv panel. It charges via USB-C and so I bought a cheapo usb solar panel off ebay and a "power bank". Turns out, the "power bank" is only for ...
Smyther's user avatar
  • 111
0 votes
1 answer
96 views

USB receptables for power delivery? [closed]

I'm not totally sure this is the right place to ask, but does anyone know of any USB C receptacles for low voltage and current power delivery? I can't find a good option with a good schematic.
CATboardBETA's user avatar
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3 answers
2k views

Safe to put USB PD with adaptor on DC IN laptop port?

I found some documentation about it but not exactly what I want: Charge a laptop without explicit USB PD capability using USB PD Does a USB PD source supply any voltage to a non USB PD compliant USB C ...
Balobiana's user avatar
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0 answers
655 views

Why does my USB-C PD trigger circuit not work in tandem with a DC-DC voltage step up module?

Good day internet humans, I am pretty new to the world of diy electonics, and am in the process of putting together a DIY portable computer monitor built from an lcd panel from an old laptop and a ...
Gert Breynolds's user avatar
0 votes
0 answers
30 views

5V from Power Delivery Charger [duplicate]

I have a PD capable charger. One interesting thing that I noticed is that if I directly plug a type-C to USB-A cable into it, I can get 5V. However, if I use a PD compatible C-to-C cable, I can't get ...
Larry Lee's user avatar
1 vote
0 answers
245 views

USB C PD source not powering simple USB 2.0 sink

I made a simple PCB that I wanted to be powered through a USB C connector with low current requirements (~50mA). I spent some time reading through the USB C Spec as well as reading other relevant ...
Colin's user avatar
  • 345
1 vote
1 answer
2k views

USB-C and >5V Power Supply

I have a question about power supplies and Power Delivery on USB-C. I'm trying to understand the USB-C specification, Power Delivery, UFP and DFP, DRP... but this is a nightmare. There are not ...
Juanma's user avatar
  • 400
0 votes
0 answers
52 views

USB3.0 PD port ORing

I was designing a product in which two USB Power Delivery ports are populated in the design so as to: Provide power from wall charger supporting PD Provide high speed communication with laptop Now ...
akshayv's user avatar
3 votes
4 answers
1k views

Always-on socket in-between a 2-way switch?

I have access to a power cable that powers devices through a 2-way switch, basically: Is it possible to add an always-on socket in between using L1, ...
Pranasas's user avatar
  • 132
0 votes
1 answer
271 views

Need a minimal circuit to obtain 5V from discrete 5V to 20V (5V, 9V 12V, 15V or 20V) input

I have a Vin that can cycle between a set of discrete levels: 5V, 9V, 12V, 15V or 20V (a USB-C PD source.) The Vin will be ...
Thomas - BeeDesk's user avatar
0 votes
0 answers
72 views

USB 2.0 0.9A and Data (hub) Simultaneously

Trying to combine USB hub and higher-than-default USB charging currents. My experience with implementing USB is close to zero, although I usually have no problems with datasheets and other designs I ...
Ilya's user avatar
  • 3,613
0 votes
4 answers
415 views

18/4 connector for repeated plugging and unplugging? [closed]

I'm designing a device for off-grid DC power delivery. Because this is a fairly specialized system that wants to minimize complexity and whatnot, the plan is for the power supply and load to be ...
Matthew's user avatar
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1 vote
2 answers
911 views

Creating a USB charger from 2-wire DC [closed]

I'm trying to tackle a problem where I want to wall-mount a USB device on a brick wall that only has a single 2-wire (14AWG) cable available, and no room / capability to run a new cable or remove the ...
Dominik's user avatar
  • 119
0 votes
0 answers
60 views

Is it ok to connect the output of a solar controller to a fused outlet on a fuse panel?

The fuse panel is breakered to a battery and is used to power other low amp equipment. The model is the 6 gang blue sea panel with blade type fuses. Since the fuse panel is just a couple pieces of ...
GregoryNeal's user avatar
0 votes
3 answers
970 views

How to connect live and neutral and earth connection in AC devices plugged into socket?

I know that when I have a fixed lamp in my house I have to use a single switch on the live wire. But when the device is connected using a plug the live wire and the neutral wire vary depending on how ...
G M's user avatar
  • 326
0 votes
1 answer
45 views

High Current Buck Converter with wide input voltage [closed]

I'm currently building a powerbank with PD outputs that are capable of outputting 5 amps at 20 volts, but my battery pack is 33.6V (8S Li-ion). I've managed to find a possible buck converter IC (...
ZHwkns77's user avatar
2 votes
3 answers
345 views

How do bypass capacitors recharge in high-frequency if the PCB can't deliver high-frequency currents?

I understand the whole theory behind bypass capacitors, how they are necessary to deliver high-frequency currents to the IC, as the PCB in general has high-inductance, thus high-impedance in high-...
mFeinstein's user avatar
  • 4,333
0 votes
1 answer
126 views

Why do new phones and tablets with a USB Type-C connector use a USB Type-A charger? [closed]

I have noticed that many relatively new phones and tablets with USB Type-C connectors (e.g., Nokia 6.1 or Samsung Galaxy Tab A T-590) are bundled with USB Type-A fast chargers (e.g., 12V, 1.5A) and a ...
Zoltan's user avatar
  • 119
0 votes
1 answer
116 views

Can a normal USB C panel mount socket be used to receive USB PD?

I'm building a lamp that has (up to) three wall-mounted units connected to a central control box. Each one gets three low-voltage control signal wires and 12V 3A DC power. I'm figuring that a USB PD ...
JefftheGreen's user avatar
1 vote
0 answers
449 views

Draw 15V from USB C Power Delivery devices

I need to draw 15V from USB C PD capable devices such as power banks or chargers. So I need a rather small tool or build for this I can draw about 15V 3A via usb c with. Thanks for your help.
Pogchamp Letsgodude's user avatar
0 votes
1 answer
177 views

Is a PD controller necessary if VBUS is always >5V?

I'm trying to implement a board that will use USB-C Power Delivery. We want to operate with 20V 5A input. If we know the source will always be at 20V, is it necessary to put a PD controller on the ...
VanGo's user avatar
  • 1,197
1 vote
1 answer
100 views

USB PD Power Delivery Skip 9V Requirement

Is there any way possible to implement a USB C PD port that only sources 5V and 15V? As I read the spec (USB Power Delivery Specification Rev. 3.0, Version 1.2, June 21, 2018) it seems that I cannot ...
EasyOhm's user avatar
  • 4,669
2 votes
0 answers
209 views

USB Type-C DRP Integrated Switch/Interface Chip

I would like to experiment with a power bank design with a single usb type-c port. The port should have dual role, source current for charging other devices as well as sink current for charging itself....
Florin C.'s user avatar
5 votes
1 answer
1k views

USB C PD fast power role swap

I'm currently designing a device, which consists of a STM32 microcontroller with USB 2.0 support, USB 2.0 hub and few dimmable leds. STM is connected to the hub, along with few other devices. Hub is ...
Mateusz Kowalik's user avatar
0 votes
1 answer
1k views

Can Neutral terminal stay connected to a power supply and Live terminal switched?

I bought the following switch which I would like to control the AC power (230V 50Hz) to an AC/DC converter with. This switch only permits one terminal to connect/disconnect, meaning I could control ...
Karl Haebler's user avatar
0 votes
2 answers
596 views

What are the limits for a USB PD charger and device to settle on a charging profile?

I've got a laptop which charges through USB Power Delivery. The charger supports the following profiles: 5V x 3A 9V x 3A 12V x 3A 15V x 3A 20V x 3.25A I know USB PD devices and chargers enumerate ...
marcv's user avatar
  • 101
0 votes
0 answers
25 views

What measures are taken to control inductance in switching stations?

I was thinking about the effect of changing loads on the power grid and I'm curious about the effects of inductance, how much inductance there is, and how to prevent it from causing voltage changes at ...
Brent's user avatar
  • 397
0 votes
0 answers
94 views

How can I figure out how large a capacitance a chip has in-package?

I'm designing a board with a fairly high frequency chip. It uses a 2.5GHz clock and can drive outputs of +-30mA total with edge rates in the 300ps range. There is a reference design using this which ...
Alex I's user avatar
  • 3,481