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Old 08-03-2011, 07:46 AM #17
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Default Re: Blue 1W mini with Tank007 driver.

Well I have another batch of ak-007's en route from DX, I think they shipped friday, so I guess i'll see what I get this time.


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Old 08-09-2011, 06:49 AM #18
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Talking Re: Blue 1W mini with Tank007 driver.

Quote:
Originally Posted by rocket689 View Post
Where did you buy the driver from, tomsk?
I bought 3pcs from DX. However, when purchased may be used by extreme left - of the circuit below, only two are available and the anode of the battery is usable. if the user is always positive - of the circuit below, the only 350mA current and have more independent institutional use.
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Old 08-09-2011, 06:54 AM #19
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Default Re: Blue 1W mini with Tank007 driver.

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Originally Posted by tomsk View Post
I bought 3pcs from DX. However, when purchased may be used by extreme left - of the circuit below, only two are available and the anode of the battery is usable. if the user is always positive - of the circuit below, the only 350mA current and have more independent institutional use.
Could you show us the URL / link to the driver on DX ?
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Old 08-09-2011, 06:58 AM #20
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Default Re: Blue 1W mini with Tank007 driver.

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Originally Posted by rhd View Post
Could you show us the URL / link to the driver on DX ?
Ok
AK-007 0.8~1.5V 3-Mode Circuit Board for Flashlights (11.9mm) - Free Shipping - DealExtreme
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Old 08-27-2011, 08:10 PM #21
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Default Re: Blue 1W mini with Tank007 driver.

Had some of the new batch in for a while. Just got around to testing one. These regulate at 360mA from 1V up to whatever the Vf of your load is. So if your running a diode that floats at 3.5V@360mA, you'll have flat regulation at 360mA from 1v to 3.5v or so input then it will start direct driving over that and current will ramp way up.

When you connect the load (-) directly to the input (-) It still boosts but there is zero current regulation. I had one pushing out 1.8A@4.5V output with a 4.2V input but it was drawing over 3.5A to do it and i'm not sure how long it would live doing that.

I plan to rip one apart when I get more time and see if I can mod one to put out more than 360mA while actually providing stable current regulation.
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Old 08-27-2011, 08:23 PM #22
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Default Re: Blue 1W mini with Tank007 driver.

Interesting....
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Old 08-28-2011, 02:05 AM #23
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Default Re: Blue 1W mini with Tank007 driver.

OMG
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Old 08-28-2011, 03:45 AM #24
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Default Re: Blue 1W mini with Tank007 driver.

Like I said. There's no regulation. the current drops as the voltage does. I imagine the only reason your build only does 1W is because that's all the power your 14500 can source current for. Probably the only reason you only saw 1170mA out of it into a test load was the actual Vf of your load was likely close to 5v.

and 4A on the input is excessive too. I know the switches in my sipiks can't take that kind of current. Plus it's not 'settable', which means this information is useless. The lower the Vf of the load, the more current it's going to source until the circuit fails. I know outputting 5V, it was putting out 1A, at 4.6V out, it was at 1.8A, 4.4V out was 2.1A.

Like I said. I'll try to decipher the circuit and try to figure out how to mod them to put out more 'regulated' current than 360mA, but i'd be surprised if it can go more than 500mA and keep regulating though.
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Old 08-28-2011, 04:21 AM #25
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Default Re: Blue 1W mini with Tank007 driver.

I use the test load, 4x1n4007 diode, so there really is good? I have read through a tutorial on NJG-18 circuit, which uses silicon diode 4x1n4007. So compared to 4x1n4007 and 6x1n4007, which enable better.

When I test with 4x1n4007, VF is measured as 4.6 V 1170mA, but when using 6x1n4007, VF 5.1 V and 600mA.

This may not mean anything?
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Old 08-28-2011, 05:23 AM #26
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Default Re: Blue 1W mini with Tank007 driver.

It means it's a boost driver. heh. The higher the output voltage, the lower the output current once you start running into the limitations of the circuit. If you'd tried it with 3x diodes, you would have probably seen 1.3-1.5A output. Though from your numbers, it kind of seems like you had some input losses due to inadequate if you were running it with a PSU@ 4.2v

When I tried it I was running it off a 20A supply and only using about an inch of fairly beefy wire between both the psu and the driver, and the driver and test load.
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Old 08-28-2011, 06:21 AM #27
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Default Re: Blue 1W mini with Tank007 driver.

If using 3x 1n4007 are not feasible, since its voltage output corresponding VF IR diode only when testing the first test load VF 2, up only about 3.8 V supply only, not suitable for 445 diode or 12X.
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Old 08-28-2011, 03:14 PM #28
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Default Re: Blue 1W mini with Tank007 driver.

You forget about the 1ohm resistor. It causes a voltage drop as well, which is why your able to use it to measure current flow.

You have to remember that the voltage your reading across the resistor gets added to the voltage drop of the diodes... And the voltage drop of the diodes is dependent on the amount of current flowing through them.

Test loads are dynamic beasts, not fixed. How many diodes it takes to emulate the Vf of the LD your wanting to simulate is going to depend on how much current your trying to ram through the test load.

I always measure the voltage the driver is putting out before the test load and adjust the number of diodes in the circuit by that instead of assuming a static voltage drop.

I've seen my 1n5407 based test load float at up to 5.3V using 4 diodes before when running high currents through it.
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Old 08-29-2011, 04:53 AM #29
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Default Re: Blue 1W mini with Tank007 driver.

Exactly. When I use 4 x 1n4007 to check the output for my diod 445nm, if the current is 1A, then Vf is 4.5 V, but increased when the current 1800mA, VF is also increased by over 5.2 V . This is not understood.
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Old 08-29-2011, 04:17 PM #30
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Default Re: Blue 1W mini with Tank007 driver.

Keep in mind that 1n400x diodes are only rated for 1A. if you want to test higher currents, you should switch to 1n540x diodes which will handle 3A, Or you could parallel them which will double the current capabilities.
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Old 08-29-2011, 11:57 PM #31
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Default Re: Blue 1W mini with Tank007 driver.

Ok just played with one of these drivers again. The top PCB doesn't affect regulation. It is purely for modes. The driver operates properly without it.

The regulator IC is stenciled CFC1H which I can't match to anything unfortunately.

However It's not hard to figure out which resistor is the current sense. It's stock value is .27 ohms. I added a .51 ohm resistor in parallel, since it was the smallest thing I had.. Which resulted in about .177 ohms of resistance. Which raised the regulated output current to 550mA

Just 'guessing' about how the IC is wired, it seems to be similar to a PAM2803. But I can't be sure of that. IF it is similiar in spec. Going to a .1 ohm sense resistor will make it put out about 950-1000mA of regulated output.. WHich is probably where it's upper limits are.
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