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Old 10-08-2011, 03:04 AM #33
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Default Re: New Linear driver! ST-DRIVE

I want to point out an issue that I've just come up against -
Lower IC Dropout Voltages Aren't Necessarily Useful

The reality is that in a 2X lithium-ion setup, a 1085 IC with a current setting resistor dropping 1.25V is still going to let you hit your desired diode current without the IC's dropout voltage ever becoming the limiting factor. Why? Because the IC is always going to be dropping more voltage than it's actual minimum dropout voltage anyway.

If you supply 8V in, and the diode needs 4.75V, then 3.25V still NEEDS to get dropped somewhere. In a DDL setup, you can drop 1.25V on the resistors, and the other ~2V on the IC. That's a fairly equal spread of heat on both sides of a driver.

Now, if you instead use one of these ICs that doesn't feature a resistor dropping 1.25V, what happens? Do you get a more efficient system? No. You just get the IC dropping more of the voltage itself. In this case, the IC would be dropping 3.25V, instead of just 2V. In other words, no matter how low your dropout voltage gets, you're STILL going to have to drop the same voltage somewhere, other than in the diode.

I just fairly extensively tested a driver that was intended to feature in the V3 of my Mosquito modules. The driver is a 4x or 5x AMC7135 setup. In testing, it runs FANTASTICALLY with 5V of input. The dropout is so low (a few hundred mV) that the full 1,400 or 1,750 mA of output is possible with just 5V in to the driver. Almost no heat is generated.

What happens if you power it by 2x lithium ions? Without current setting resistors dissipating heat, it ALL falls to the ICs, and they get scorching hot. Not a good design feature.

So I guess my message is - for Blues, we're at the limit of what we can do with linear drivers. The drop-outs are already below what we need them to be for 2x lithium ion setups. 1x lithium ion setups will never be possible from a linear setup because the Vf of a 445 is above a single cell's voltage. So - we're done


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Old 10-08-2011, 05:30 AM #34
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Default Re: New Linear driver! ST-DRIVE

Hmm. RHD makes a point. Also... these won't work for reds, because they aren't continuous on the negative

Hey, when are my drivers going to be shipped out, by the way? I sent you the payment :P
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Old 10-08-2011, 05:54 AM #35
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Default Re: New Linear driver! ST-DRIVE

Monday, im in Ohio for a bit.
But will be back sunday night.
They can be used for reds BUT you must isolate the diode.
ITs not as hard as it sounds but you do need a bit different heatsink.
just a tiny bit wider.
or another method a bit risky but works is to use a good quality spray paint and coat where the heatsink is going to sit. after a few coats the heatsink will be isolated from the host and you can use what ever you want.
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Old 10-08-2011, 06:20 AM #36
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Default Re: New Linear driver! ST-DRIVE

Hmm, sounds good. Just wanted to make sure you didn't forget
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Old 10-14-2011, 07:29 PM #37
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Default Re: New Linear driver! ST-DRIVE

Is it possible to get the smaller driver in 600mA ?
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Old 10-14-2011, 07:43 PM #38
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Default Re: New Linear driver! ST-DRIVE

yes a .2 and a 1ohm resistor
how ever my 1 ohm resistors are not 1ohm they are ranging. from .95 to 1.15 ohms
So it will be around 600mw
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Old 10-14-2011, 08:05 PM #39
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Default Re: New Linear driver! ST-DRIVE

What if I purchased them unset, could I add this?
Digi-Key - RHM.16MCT-ND (Manufacturer - MCR10EZHFLR160)

Is my math correct in thinking that this would produce 625 mA ?
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Old 10-14-2011, 08:21 PM #40
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Default Re: New Linear driver! ST-DRIVE

Yup as long as you can solder smd.
I have 2 boards with no set resistors in front of me.
But i cant much change the price if you want them unset.
as the resistor cost when i buy them is less 0.10$ a resistor
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Old 10-14-2011, 08:33 PM #41
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Default Re: New Linear driver! ST-DRIVE

Quote:
Originally Posted by kiyoukan View Post
Yup as long as you can solder smd.
I have 2 boards with no set resistors in front of me.
But i cant much change the price if you want them unset.
as the resistor cost when i buy them is less 0.10$ a resistor
Haha, that's not a problem, you can charge me the same

What is the price ?
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Old 10-14-2011, 08:45 PM #42
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Default Re: New Linear driver! ST-DRIVE

pm sent to ya
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Old 10-15-2011, 12:03 AM #43
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Default Re: New Linear driver! ST-DRIVE

The +/-10% precision is worrisome for me. At 1A, that would mean it could fluctuate anywhere from 900mA to 1100mA. I'm also not sure what it means by that precision, whether it is simply something that can be compensated for, or if the device itself will fluctuate during operation. The LM317, by comparison, has extremely good regulation, even if it has a high Vdrop.
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Old 10-15-2011, 03:15 AM #44
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Default Re: New Linear driver! ST-DRIVE

no no no it does not bounce it just set at that value.
So its a pain but new ones are on the way. along with more resistors.
From my test load it does not change.
2 drivers both with the same resistors one was 50mw higher than the other.
but both stayed constant with no change.
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Old 10-15-2011, 05:45 AM #45
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Default Re: New Linear driver! ST-DRIVE

Ah, so a die-to-die variation kind of thing. That's okay then.
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Old 10-17-2011, 11:02 PM #46
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Default Re: New Linear driver! ST-DRIVE

Is there any chance we could use a variable resistor?
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Old 10-17-2011, 11:05 PM #47
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Default Re: New Linear driver! ST-DRIVE

Um maybe.
Can you find a variable resistor in and around 1 ohm?
If so then i would redesign this driver right now and go with that.
Unless the 1ohm pot cost way to much.
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Old 10-17-2011, 11:29 PM #48
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Default Re: New Linear driver! ST-DRIVE

3223W-1-100E Bourns Trimmer Resistors - SMD
this may work but maybe
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