Author Topic: Problems using the TI TPS2511 USB charge controller  (Read 5506 times)

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Offline fubar.gr

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Problems using the TI TPS2511 USB charge controller
« on: October 06, 2014, 05:21:05 pm »
I am trying to use the TPS2511 in the following topology:



This is my board:



It is not working. Any ideas why?

Offline Skimask

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #1 on: October 06, 2014, 05:26:02 pm »
5v not hooked up?

Seriously?

Is that all the information you have to present?
I didn't take it apart.
I turned it on.

The only stupid question is, well, most of them...

Save a fuse...Blow an electrician.
 

Offline Christopher

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #2 on: October 06, 2014, 05:31:09 pm »
Sure you have 5V Input? Hook up the 5V input to a bench supply.

What if it's a dodgy chip or solder joint? Can you confirm this?

Also you may want some bulk cap (56-100uF?) on the input & some 10n, 100n decoupling on the IC.
 

Offline fubar.gr

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #3 on: October 06, 2014, 06:14:26 pm »
This is the schematic:



I've double checked everything. Nothing is shorted and everything seems soldered properly. I haven't tried another chip yet.

Offline SeanB

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #4 on: October 06, 2014, 06:58:44 pm »
Out has to be connected to the USB port, it is the switch output, otherwise the chip does not see any load and stays off.
 

Online Monkeh

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #5 on: October 06, 2014, 07:28:50 pm »
Chip backwards. Bad solder joint. Fried chip (should still get slow charging..). Why, exactly, are you bothering with a chip when all it's doing for you is putting a resistor across the data pair?

Out has to be connected to the USB port, it is the switch output, otherwise the chip does not see any load and stays off.

Think that one through, then ponder why they have a 'no switch' example in the datasheet..
 

Offline fubar.gr

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #6 on: October 07, 2014, 12:45:48 pm »
You guys are right.

It is not possible for this topology to work.

I've made this board too, where the voltages on the data pins can be manually adjusted with the two trimpots.


If the voltages are adjusted while the mobile phone is already connected, it won't start drawing more current. It has to be disconnected and reconnected again.

So even if the IC is setting the voltages correctly, it has no way to disconnect power to the phone, therefore it can never work.

Why, exactly, are you bothering with a chip when all it's doing for you is putting a resistor across the data pair?

This IC is also trying several combinations of voltages on the D+ and D- pins.

Online Monkeh

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #7 on: October 07, 2014, 12:48:25 pm »
Why, exactly, are you bothering with a chip when all it's doing for you is putting a resistor across the data pair?

This IC is also trying several combinations of voltages on the D+ and D- pins.

It cannot do so effectively in that configuration. You may as well short D+ and D-, because that's more or less what it's good for used like that. (actually, I'm not sure which charging mode it attempts first and it's fairly irrelevant, as it's a waste of silicon unless it actively controls the port)
 

Offline peter.mitchell

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #8 on: October 07, 2014, 01:18:23 pm »
use the right chip for the job.
ive used the TPS2513 in a few things lately, it should work fine in your application and IIRC its cheaper too.
 

Offline sumadomi

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Re: Problems using the TI TPS2511 USB charge controller
« Reply #9 on: September 01, 2015, 09:29:47 pm »
Connect te output pin to the vbus, cut the trace to the 5v rail and use the enable pin

 


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