Desperatly looking for driver (updated kennan driver?)

[Microa]

I have not counted the cost. I bought the IC at US$0.50/pc for 10 pieces excluding shipping charges.

 

[VegasF6]

Microa, I have been unable to find this IC anywhere for sale in the U.S. If you have access to some more or perhaps a contact I would be appreciative! Looking to get at least 10, maybe 20.

Thanks!

 

[Roger555]

I have not counted the cost. I bought the IC at US$0.50/pc for 10 pieces excluding shipping charges.[/QUOTE

Actually what I meant are you willing to sell me a couple modified.drivers? I really need a good set of 2.5 amp drivers for my xml project.

 

[Microa]

I am sorry that I am not going to sell my modified drivers. I made it for fun.

 

[malow]

just to inform, i just received 10x ax2002 drivers from focalprice (SKU: LFD29X). i was afraid it would be one of the variations around (like some users mentioned from the same driver from dealextreme), but all where ax2002 exactly like this one:

http://i.imgur.com/ZjtF4.jpg

ax2003 would be better for my needs, but $1.34 for each unit was very good.

XML's, here we go

 

[Microa]

VegasF6, The AX2003 is difficult to find in China too. Microbridge is the agent of this IC in China but they are wholeseller not interested to sell small quantity to DIYers. I tried to contact the supplier which I bought from him last time and regret to find that he was out of business. I have 8 pieces left. Do you think these can help?

 

[VegasF6]

Well I wouldn't want to take the only one's you have on hand, especially not all of them. If it wouldn't be too terrible an inconvenience I might consider buying 2 of yours but honestly, it may not be worth the trouble for you.

Initially I had hoped to make up some 3A adjustable boards, but if there is no available supplier probably best I just find another IC.

Thanks for taking the time to try and find them though, that was generous.

 

[Microa]

VegasF6, PM your address. I will send you the Christmas present.

 

[Microa]

Hi VegasF6, Your PM inbox was full. I would like to reply your question here. I have only tried to drive a single XML at 3A with a 18Vdc switching power supply. According to the data sheet, Vin 3.6-23V, Vout 0.25-Vcc, I think it is capable to do the job if you have taken good care of the spark pulses of the engine. The data sheet is available here. http://www.micro-bridge.com/AX2002_AX2003.asp

 

[VegasF6]

Got that all cleaned out, thanks. Looks like a winner!

 

[Roger555]

Microa- I have several of these "older" drivers frim DX with the AX 2002 IC. If I wanted to achieve a similar 2.5 A driver could I swap out the IC to the AX2003 (If I can find one) , replace the diode with a 3A (CMS04) & what about the inductor what size or model did you upgrade to?

This is what I have right now

 

[Microa]

The model of the inductor is TCRH104R-220K(22uH) shielded type inductor. 10.3 x 10.4 x 4mm Idc max 2.9A Irms max 2.5A. The inductor on the DX board is TC0504 sizes is 5.8 x 5.2 x 4.5mm which is about 1.5A rated. If the sizes is your contraint, try to find a 10uH with the highest possible current rated inductor. The near biger size TC0705 is 7.8 x 7.0 x 5mm which Idc is 2.3A for 10uH. If you solder it carefully, may be it can fit that tight space.

 

[Microa]

The doide SS34 is already a 3A doide which you need not to change. The sensing resistor I used two R200 in parallel which is 1206 power type rated 1/2W each. normal type 1206 only rated 1/4W. Also, you should take care of the heat generated by the IC. otherwise, the LED will be blinking because the overheat protection will shut off the IC, then it cool down and on again and then overheat shut off ........

 

[Roger555]

How about this inductor, seems to match the requirements right? Pretty small too 6.47 mm W x 6.86 mm L x 3 mm H

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http://www.vishay.com/docs/34190/ihlp25cz.pdf
http://www.mouser.com:80/ProductDet...GAEpiMZZMsg%2by3WlYCkUwYD3kRwGDiVuGxgjt7Mxk8=

Also R200 is .20 Ohm right?

Regarding the IC, I will need to find and replace the existing AX2002 with an AX2003 along with these modifications correct? Too bad I cant seem to find any thus far

 

[li_gangyi]

If there's any sorta of demand for these AX2003 ICs, I could get a friend to source for them.

 

[Microa]

Roger555, The vishay inductor seems OK. R200 is 0.20 ohm +/-1%. The calculation formula is Iled=Vsen/Rsen, Iled=0.25V/0.10R (2 R200 in parallel) =2.5A.
I have 2 pieces left, PM me with your address if these 2 pieces can help. Cheer,

 

[moderator007]

If there's any sorta of demand for these AX2003 ICs, I could get a friend to source for them.

Hi li gangyi, VegasF6 was looking to buy 10 to 20 AX2003. You might PM him to see if he is still looking for some.

 

[Justin Case]

The 10uH Vishay inductor might be a better choice than the 22uH. You'll get probably 40% less total inductor loss (maybe 0.6W vs 1W of core, DC, and AC loss), but with more ripple current. The biggest loss component is the DC loss.

 

[Roger555]

Hey Justin your PM box is full!

 

[li_gangyi]

A little OT, does anyone know offhand if someone makes a multimode driver that uses the AX2002? Or is that gonna be a custom DIY deal?