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Old 09-03-2012, 10:10 PM #225
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by AnthoT View Post
Page 8 post # 193 it was scoped
That doesn't show startup. That's just showing ripple currents and stability testing...

Unless I'm missing something completely.


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Old 09-03-2012, 11:31 PM #226
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Think this was addressed in post 45 by adding a 100uF cap across the diode. One thing to note is that an output cap is normally chosen by its effective series resistance (ESR), because this is what determines output ripple voltage. Get a cap that has a ESR that is from 0.025-0.2ohms. AVX caps are nice. A SMD solid tantalum type if you got the space. Anyway when I get hold of one of these drives Ill scope the crap out of it =)


Quote:
Originally Posted by Le Quack View Post
That doesn't show startup. That's just showing ripple currents and stability testing...

Unless I'm missing something completely.
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Last edited by Onryo; 09-03-2012 at 11:38 PM.
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Old 09-04-2012, 12:00 AM #227
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Scope the crap out of it, and check it for spikes, because like I said, I'm using one of these chip's sisters, and using an LT6106 as well, and it's giving me a terribad startup spike. :/

I wonder if I need to increase the input capacitance... Hm.
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Old 09-04-2012, 12:23 AM #228
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

If you are using a TI chip there is a good chance you do not need the zener diode across LT6106. Most TI chips are already voltage protected and a zener cause all sorts of problems. Then there is the cap across the laser diode. It acts as a buffer so to say. When a surge of current comes in and the cap is "empty" it will fill to capacity. When the cap is "loaded" it will act like a "mini battery" and dump that energy back to the LD if needed. This is why it helps smooth out the choppy output from the boost. You probably know all this already so Ill get to the point. When you first turn on your laser and the output cap is empty it will absorb some of that current spike. You want your cap to be able to absorb that current spike asap. Having a high ESR will make the cap less responsive speed wise to the train of noise and spikes.
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Old 09-04-2012, 12:29 AM #229
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

You can use Tina-TI to simulate the startup spikes with different batteries... the output overcurrent at startup is intrinsically limited by the battery internal impedance and the resistance of the power switch that you are using...
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Old 09-04-2012, 12:42 AM #230
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

It's not so simple... driving a large capacitive load could produce control loop oscillations. The same if you use a series inductor too high
The zener diode question has been widely discussed.

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Originally Posted by Onryo View Post
If you are using a TI chip there is a good chance you do not need the zener diode across LT6106. Most TI chips are already voltage protected and a zener cause all sorts of problems. Then there is the cap across the laser diode. It acts as a buffer so to say. When a surge of current comes in and the cap is "empty" it will fill to capacity. When the cap is "loaded" it will act like a "mini battery" and dump that energy back to the LD if needed. This is why it helps smooth out the choppy output from the boost. You probably know all this already so Ill get to the point. When you first turn on your laser and the output cap is empty it will absorb some of that current spike. You want your cap to be able to absorb that current spike asap. Having a high ESR will make the cap less responsive speed wise to the train of noise and spikes.
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Old 09-04-2012, 02:24 AM #231
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

I am going to do a build with this I am just still unsure what I want to do.. I have all sorts of stuff here but I just dont seem to have something that will work.. round without contacts and euda's heatsinks.. I could do it in a b50 or a erm c6.. That would not do it justis.. the c2 would be kewl but the fit is tight to the driver sink.. So I duno what will work. Any suggestions would be appreciated.. I love the driver but other than sinking it to a diode heatsink or sticking it in a pill I duno..
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Old 09-04-2012, 05:40 AM #232
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

I have tested it and there are no current spikes on startup. I mentioned that although I didn't take a scope picture of it..

LeQuack - check your feedback compensation loop or the output capacitance might be low. Do not put zener diodes.
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Old 05-13-2017, 08:16 AM #233
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Is it used for all diodes?-I want to ask about their power input,1 or 2pcs 3,7 vont
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Old 05-13-2017, 08:59 AM #234
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Is it used for all diodes?-I want to ask about their power input,1 or 2pcs 3,7 vont
Check the date on threads before you post ... the last reply to this thread was in 2012.
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Old 05-13-2017, 10:30 AM #235
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Is it used for all diodes?-I want to ask about their power input,1 or 2pcs 3,7 vont
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