Linked Questions

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0answers
38 views

Default behavior of a USB device in the presence of 5v [duplicate]

This is a follow on from this question Given a home made USB charger that simply provides 5 volts across the GND and VCC pins of a USB port, what should the default behavior be of any mobile device (...
0
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0answers
32 views

Usb charger not charging only with vcc and gnd [duplicate]

I want to charge my tablet on the wall. And I have a charger behind the tablet and connected 2 wires to vcc and gnd, the same pins as usb female, it turns out that I can't have more than 10 mA. If I ...
2
votes
3answers
657 views

How do phones charge their battery at seemingly any rate with no issues? 500mA or 1A or 1.2A depending on the charger?

If most use some sort of li-ion battery, and those batteries like to be charged in CCCV format how can my phone charge just fine at 5V, 500mA or 5V, 1A or 5V, 1.2A just fine (actual current delivered, ...
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votes
2answers
1k views

USB charger - tell the phone it can draw more power [duplicate]

I have 8A 6port usb charger. It has two ports marked as fast charing, and the phone here actually charges faster than in the two other ports. When I dismantled it, all the USBs were on the same power ...
1
vote
1answer
1k views

Phone charging current draw [duplicate]

I want to use a power regulator PCB I designed to switch down 60V to 12V and 12V to 5V in order to power a USB plug and use it as a phone charger. My only worry is that the switching regulators I am ...
1
vote
1answer
249 views

How is it possible, with 2 “20 AWG” cables each capable of 2 amps, for one to give 0.4A to my phone and the other 0.7-0.9A?

I'm aware that my phone might only demand max 1A. Let's suppose it does. Still, the following is strange to me- How is it possible, with 2 "20 AWG" cables each capable of 2 amps, for one to give 0....
0
votes
2answers
155 views

Bus-powered non-USB device (like fan,lamp) USB pin arrangement to getting highest power from USB host

Bus powered means device that only use Vbus of USB for it's power supply. I want to use micro USB as my board power supply. The is designed to take 600mA by 3.3v regulator. But I just don't know how ...
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2answers
116 views

Two 5V2A powerbanks draw different current under same conditions?

I have 2 different powerbanks, both have 10000 mAh and both are rated for 5V 2A power input. I have noticed that they draw a different amount of current despite using the exact same charger (5V 3A), ...
-1
votes
2answers
164 views

Higher current draw from powerbank?

I have a powerbank with a 20,000 mAh capacity, from which I can power different devices. The devices include an LED strip and a Raspberry Pi Zero W (RPI Zero W). The LED strip consists of 60*5 ...
0
votes
1answer
80 views

Design a power supply from USB

I'm designing a microcontoller wherein I want to use conventional chargers or draw power from USB port so I used a type C micro USB. In my initial design, I'm assuming that I only need the Supply ...
2
votes
1answer
75 views

How to use USB-C cable with a charger

Ill try to be as brief as possible. TL;DR: How to use my 3A 5V USB-C charger to power a dumb device that needs 5V 3A to run. My goal: I want to have a nightstand, that can charge 3 devices at the ...