Car phone charger with AD85063D. Does it deliver?

[bushtech]

I am curious about this charger. Can it actually supply 2.1A as stated on the charger? When it was still working it mostly charged at 300 or 600mA.

Here is the datasheet application for the charger:

And here is the diagram for the actual charger: as I drew it in LTspice. Please be patient with me. I am battling with spice. I could not find the AD85063D chip for spice so drew it in manually just with pinouts. Ditto for the double USB port. There is a very large possibility that there are caps and diodes the wrong way round or that there are a pcb tracing errors








I am hoping that somebody could have a look at this diagram and tell me if it is possible for this charger to deliver 2.1A. The AD85063 datasheet states 1A @12V

Thank you and apologies in advance if the spice design is horrible.

 

[davenn]

When it was still working it mostly charged at 300 or 600mA.

that is probably because it's controlled by the charging circuit in the device you are plugging it into .... which you haven't stated what it is ???


Dave

 

[bushtech]

Dave

Samsung galaxy S4. Often see 2.1A when plugged in to wall charger (220V)

 

[bushtech]

Correction. 1.2A

 

[davenn]

Dave

Samsung galaxy S4. Often see 2.1A when plugged in to wall charger (220V)

You mean with a charger made for the phone ?

 

[bushtech]

Yes genuine Samsung charger

 

[davenn]

Correction. 1.2A

yeah, the datasheet I found on line a moment ago says 1.2A max
that is for that IC, NOT the Samsung

you have to remember that when a charger is plugged in, it is most likely being used to supply the phone as well as charge the battery so hence the higher current (1.2A) rather than a few 100mA

just a thought.... there's also likely to be differences between the genuine Samsung charger and that circuit you have shown above

 

[bushtech]

I am also using a Samsung cable to connect it, so just curious why it usually charges at 300-600mA. At 300mA the phone actually loses charge while charging

 

[davenn]

I am also using a Samsung cable to connect it, so just curious why it usually charges at 300-600mA. At 300mA the phone actually loses charge while charging

read my last sentence again

 

[bushtech]

Sorry, didn't see the last bit. Very possibly. I'm not going to buy a genuine Samsung car charger just to compare

 

[Alec_t]

Some phones recognise a 'genuine' charger by sensing certain voltages on the USB data pins. If those voltages are 'wrong' the phone may not accept a high charge rate.

 

[bushtech]

Just found this on some website (instructables). Apparently what android phones require.
R1=75k ,R2=R4=51k,R3=43k

 

[bushtech]

If I read it correctly the above diagram gives 2 different voltages to pins 2 and 3 whereas my spice diagram sends the same voltage to pins 2 and 3

 

[bushtech]

I would love to get to that spice diagram to work but to do that I have to insert the IC in there. Is it possible to get that IC into spice.? Or another program like Tina, etc

 

[Nickholas Hill]

I have one of these here. Connected it to a programmable load. Maximum sustained current is 700ma. Starts at about 1A but as the lighter converter heats up, current drops. Seller claims 2.1A. Ha!