Charger NOT EQUAL with Power Suppy

A place to talk about all the Operating Systems, Software & Hardware
Forum rules

- Posts are to be made in the relevant forum. Users are asked to read the forum descriptions before posting.

- Members should post in a way which is consistent with "normal writing". That is users should not post excessive numbers of emoticons, large, small or coloured text, etc. Similarly users should not SHOUT or use excessive punctuation (e.g. ! and ?) in topic titles or posts.

- Members should use an appropriate, descriptive subject when posting a new topic. Examples of bad subjects include; "Help me!", "I'm stuck!", "I've got an error!", etc. Examples of good subjects include; "Getting an TABLE FULL error upon login", "Cannot restore a backup".

- Members are asked to post in English only so that posts can be well received and properly monitored.

- Spam is not tolerated here under any circumstance. This includes offering hosting services (charged and free), installation services, solicitation etc. Recruiting members for your own projects (moderators, designers, professional MOD work, etc.) is not permitted and is also considered spam. Users posting spam will be warned and their post removed.

- Members should post in a way that is respectful of other users. Flaming or abusing users in any way will not be tolerated and will lead to a warning. Vulgar language and inappropriate material is not allowed and will be removed. We try to maintain a family friendly atmosphere whenever it is possible within the main subject matter of this community. Please keep this in mind when participating.

- Each user is allowed to create one account. If you would like to change your username, please contact us and, most likely, we can do it for you while you can keep all of your profile data, posts, and other content.

- If a user violates our guidelines and shows a disregard for them, our staff and our community, they run the risk of losing their account. We reserve the right to deactivate any account and to edit or remove any content without warning. These guidelines are subject to change at any time without notice.

Thank you for visiting LattePanda.com!
User avatar
drietakt
Posts: 1
Joined: Mon May 23, 2016 10:43 am

Mon May 23, 2016 1:06 pm

My 2 cents: Connecting a 5V power supply via CN2 works MUCH better than via microUSB!

I have several 5V/2A supplies, but none of them worked with my LP. After some testing the problem turned out to be the micro-USB cable. I tried several different cables; they all caused too much voltage drop.

As a workaround I built my own cable to a 2-pin plug for connector CN2. Problem solved; now the LP is as stable as a rock.

NOTE: The PCB has markings for 5V and ground; be careful not to connect them the wrong way around!

User avatar
cyberlife
Posts: 3
Joined: Mon May 23, 2016 5:23 pm

Mon May 23, 2016 8:38 pm

Someone mentioned the following PSU in the comments section on kickstarter. I bought one of these for when my LP arrived and I have to say it's very stable with led issues, no sudden shutdowns, HDMI and bluetooth keyboard plugged in without issue.

https://www.amazon.co.uk/gp/product/B01 ... UTF8&psc=1

User avatar
schluej
Posts: 75
Joined: Sun May 01, 2016 7:19 pm

Wed May 25, 2016 3:50 pm

A little calculation:
We have 2 x USB 2 both with 500mA = 1 A.
We have 1 x USB 3 with 900 mA.
So we have 1.9 A only for the USB ports.
If you are using a 2.1 A power supply you have 0.2 A for the LattePanda CPU.
And the Intel CPU needs about 2A. So we have 3.9 A.
Oh we have also a Arduino I am not sure lets take 1 A.
So we have about 4.9 A. This is an 2.3 overload of your 2.1 A power supply.
And now you wondering why you have trouble :shock: ?
Last edited by schluej on Wed May 25, 2016 5:36 pm, edited 1 time in total.
Live long and prosper!
Joern

User avatar
ermingut
Posts: 9
Joined: Sun Apr 17, 2016 8:37 am

Wed May 25, 2016 5:10 pm

@schluej

Sorry schluej, but you re taking nonsense. With those 4.9Ah you are saying that LattePanda is using 4.9 A over a period of one hour (or 2.45 A over 2 hours or maybe 0.49A over 10 hours) :| . That is energy you are taking about. Normally rechargeable batteries capacity is measured with Ah (or mAh) not output voltage and current of an power supply.

So by powering LattePanda is simple as that: Power supply must provide enough current (for all devices on LattePanda, USB if in use, CPU, mempry, drive) with constant voltage of 5V. If power supply is not providing enough current the voltage will drop (may be for protection, if not protected it will destroy itself, some funny current regulation of smart charger and so on...) and LattePanda will become unstable. And with any kind of battery charger one will have pure luck that LateePanda wil preform as expected.

You have to find "dumbest" possile power supply with appropriate voltage and maximun current ( 5V - maybe 3 Amps max) for normal operation of LattePanda.

May be something like this:
http://www.ebay.com/itm/221703338635?_t ... EBIDX%3AIT

User avatar
schluej
Posts: 75
Joined: Sun May 01, 2016 7:19 pm

Wed May 25, 2016 6:25 pm

ermingut wrote:@schluej

Sorry schluej, but you re taking nonsense. With those 4.9Ah you are saying that LattePanda is using 4.9 A over a period of one hour (or 2.45 A over 2 hours or maybe 0.49A over 10 hours) :| . That is energy you are taking about. Normally rechargeable batteries capacity is measured with Ah (or mAh) not output voltage and current of an power supply.

So by powering LattePanda is simple as that: Power supply must provide enough current (for all devices on LattePanda, USB if in use, CPU, mempry, drive) with constant voltage of 5V. If power supply is not providing enough current the voltage will drop (may be for protection, if not protected it will destroy itself, some funny current regulation of smart charger and so on...) and LattePanda will become unstable. And with any kind of battery charger one will have pure luck that LateePanda wil preform as expected.

You have to find "dumbest" possile power supply with appropriate voltage and maximun current ( 5V - maybe 3 Amps max) for normal operation of LattePanda.

May be something like this:
http://www.ebay.com/itm/221703338635?_t ... EBIDX%3AIT
Jepp if you need not more than 3A you are right, so don't use all USB ports with maximum load or I am right...
Live long and prosper!
Joern

Post Reply