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17mm buck-boost driver (TPS63020 and LT6106)

laserluke

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Open source laser driver. Final version
happy testing :)



gerber files FINAL VERSION

eagle v6 files FINAL VERSION

TINA-TI simulation file


TINA-TI is a free Texas Instruments Spice-based analog simulation program

Inductor XFL4020-152ME

DigiKey parts:
D1 - 568-6287-1-ND
C2, C3, C4, C5 - 445-8028-1-ND
R3 (Shunt, package 0805) - WSLA-.01CT-ND
R2 (current set trimmer) - 3214W-201ETR-ND

R1 (5 Kohm), R4 (10 ohm) - package 0603, use components with a good temperature coefficient (<100ppm/C)
C6 (100uF) - package 1206
C1 (0.1uF) - package 0603, any good decoupling capacitor
R5 (470 ohm) - package 0603
C7 (10 nF) - package 0603

R5-C7 form the loop frequency compensation network.
C8 is optional (secondary pole for testing purposes).
The values of R5 and C7 can be experimentally adjusted.
With the given trimmer R2 the output current range is 0.1 to 2.1 A

.
 

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AnthoT

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Cool but do you have any test results??? How well does it work, parts list, it seems you want to make it open source which is great :beer:
 

laserluke

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Cool but do you have any test results??? How well does it work, parts list, it seems you want to make it open source which is great :beer:
I want to make it open source. Everyone can try it and, if possible, improve it...
This is the right spirit for this project.
I think that many people of this forum know the capabilities and limits of the TPS63020. I hope this circuit becomes the right way to use it for lasers
 

AnthoT

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I want to make it open source. Everyone can try it and, if possible, improve it...
This is the right spirit for this project.
I think that many people of this forum know the capabilities and limits of the TPS63020. I hope this circuit becomes the right way to use it for lasers
I'll order a few and let you know how they work :beer: that's why I was asking a parts list :p
 

laserluke

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I'll order a few and let you know how they work :beer: that's why I was asking a parts list :p
Ok... DigiKey parts:
D1 - 568-6287-1-ND
C2, C3, C4, C5, C6 - 445-8028-1-ND
R3 (Shunt, package 0805) - WSLA-.01CT-ND
R2 (current set trimmer) - 3214W-201ETR-ND

R1 (5 Kohm), R4 (10 ohm) - package 0603, use components with a good temperature coefficient (<100ppm/C)
C1 (0.1uF) - package 0603, any good decoupling capacitor
C7 (1 nF) - package 0603, optional to reduce the feedback path noise

L1 - Coilcraft XFL4020-152ME (you can obtain free samples from Coilcraft here)
 

foulmist

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That looks great but shoudn't the V+ of the LT6106 be connected to the input (to the battery) instead of the output of the driver? :thinking:

and why is the zener used at all? I don't see why it's needed.. please explain.

and I think those 6.3V caps are better to be replaced with 10V caps.

can you test the output with oscilloscope? tps63020 it's known to show ripple currents when using high-side current sense monitoring.
 
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laserluke

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That looks great but shoudn't the V+ of the LT6106 be connected to the input (to the battery) instead of the output of the driver? :thinking:

and why is the zener used at all? I don't see why it's needed.. please explain.

and I think those 6.3V caps are better to be replaced with 10V caps.

can you test the output with oscilloscope? tps63020 it's known to show ripple currents when using high-side current sense monitoring.
1) In the high side current sensing circuit, the V+ is connected to the current source because the +IN of the opamp must not exceed V+.
2) If you leave the driver's output without a load (the laser diode), the driver has a zero voltage feedback and increases the output voltage until output capacitor make a loud boom!!! The zener diode solves this problem: when the sum of output voltage+0.5Volt nominal feedback is more than Vz, in the zener diode starts to flow current, the feedback becomes again effective and the output voltage is limited.
3) You can replace the 6.3V capacitors with 10V if you can find 22uF with 0603 package. :)
4) Why tps63020 should shows ripple currents when using high side current sensing? It seems a not established generic statement.
5) At last... you can try yourself to test the output with an oscilloscope. It's an open source project :)
 

foulmist

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I asked because the TPS63020 has already build in OVP that's why I think the zener is not needed. It's actually 6.7-6.9V = the OVP. Already tested :)

1) In the high side current sensing circuit, the V+ is connected to the current source because the +IN of the opamp must not exceed V+.
2) If you leave the driver's output without a load (the laser diode), the driver has a zero voltage feedback and increases the output voltage until output capacitor make a loud boom!!! The zener diode solves this problem: when the sum of output voltage+0.5Volt nominal feedback is more than Vz, in the zener diode starts to flow current, the feedback becomes again effective and the output voltage is limited.
3) You can replace the 6.3V capacitors with 10V if you can find 22uF with 0603 package. :)
4) Why tps63020 should shows ripple currents when using high side current sensing? It seems a not established generic statement.
5) At last... you can try yourself to test the output with an oscilloscope. It's an open source project :)
 
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AnthoT

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Nice!
I'll try it out soon and let you know :beer:

Ok... DigiKey parts:
D1 - 568-6287-1-ND
C2, C3, C4, C5, C6 - 445-8028-1-ND
R3 (Shunt, package 0805) - WSLA-.01CT-ND
R2 (current set trimmer) - 3214W-201ETR-ND

R1 (5 Kohm), R4 (10 ohm) - package 0603, use components with a good temperature coefficient (<100ppm/C)
C1 (0.1uF) - package 0603, any good decoupling capacitor
C7 (1 nF) - package 0603, optional to reduce the feedback path noise

L1 - Coilcraft XFL4020-152ME (you can obtain free samples from Coilcraft here)
So that's looking at 14.92$ per board (no shipping or PCB) with the TPS63020 and all the components you listed
 
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foulmist

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Nice!
I'll try it out soon and let you know :beer:



So that's looking at 14.92$ per board (no shipping or PCB) with the TPS63020 and all the components you listed
my driver is a similar one and components are pretty much the same price per board. you add the pcb, work and stuff and you are looking at ~$20 per board
 
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AnthoT

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my driver is a similar one and components are pretty much the same price per board. you add the pcb, work and stuff and you are looking at ~$20 per board without any profit :D.
I don't think I'm going to sell them actually, I only wanted to make one or two for a future builds I had planned :D I have a reflow oven so depending how much or how little work I'll see wether i end up deciding to sell them... I don't think I will though
 

foulmist

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I don't think I'm going to sell them actually, I only wanted to make one or two for a future builds I had planned :D I have a reflow oven so depending how much or how little work I'll see wether i end up deciding to sell them... I don't think I will though

be sure to test them on scope first with a test load. And sharing the results would be nice :)
 
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AnthoT

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be sure to test them on scope first with a test load. And sharing the results would be nice :)
I don't have a scope :(
I can share any other results though :D I'll be ordering them sometime this week, I'll have time then
 

cilegray

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Great Wall of China
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LMAO. Most. Random. Ever.
 
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cilegray

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laserluke I wasn't making any mention to your driver, which does deserve a :beer: for being open sourced!

You should edit your last message instead of posting twice in a short amount of time if nobody has replied... double posting is often frowned upon.
 




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