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Old 06-02-2012, 09:56 AM #81
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by tsteele93 View Post
I think this will fit, but the currents are probably too low?

ELL5PR1R5N - PANASONIC - CHOKE COIL, SMD, 1.5UH, 30%, 2 | Newark
The major limit is the 40°C rise current (2.5A). You should expect this inductor become (very) hot when the output is at 1.8A but you can try it...


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Old 06-02-2012, 10:12 AM #82
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by Wolfman29 View Post
This is quite possibly a good replacement for the Flex. Unfortunately, it still doesn't solve the >5.5V in or 5.5Vout problem that the Flex has too. Means they can't run 12x diodes.
There is a simple solution for this problem... if you put a battery at the output of the driver and in series with the load, you solve the problem because the driver output voltage adds itself to the battery voltage (you must connect the negative of the battery to the driver output and the positive to the diode).
If you simulate this situation with tina-ti you will find that you can drive a test-load of 12 silicon diodes.
You will have a two-batteries buck-boost driver with extended output range and also with relaxed driver operation.
This solution could be, more generally, applicable to any driver and a battery that can sustain the output current flow through itself

Last edited by laserluke; 06-02-2012 at 11:04 AM.
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Old 06-03-2012, 04:33 AM #83
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by laserluke View Post
The major limit is the 40°C rise current (2.5A). You should expect this inductor become (very) hot when the output is at 1.8A but you can try it...
Ok, how about this one?

PCMC053T-1R5MN Susumu | 408-1371-1-ND | DigiKey

Inductance 1.5µH

Current 6A
Current - Saturation 10A
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Tolerance ±20%
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Package / Case 0.205" L x 0.185" W x 0.118" H (5.20mm x 4.70mm x 3.00mm)
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Old 06-03-2012, 04:37 AM #84
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Interesting, luke. Mind throwing up a schematic? I think I am getting what you are saying, but not sure.
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Old 06-03-2012, 04:42 AM #85
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by laserluke View Post
There is a simple solution for this problem... if you put a battery at the output of the driver and in series with the load, you solve the problem because the driver output voltage adds itself to the battery voltage (you must connect the negative of the battery to the driver output and the positive to the diode).
If you simulate this situation with tina-ti you will find that you can drive a test-load of 12 silicon diodes.
You will have a two-batteries buck-boost driver with extended output range and also with relaxed driver operation.
This solution could be, more generally, applicable to any driver and a battery that can sustain the output current flow through itself
This is dangerous. You're essentially putting the laser diode at the mercy of whatever the second battery wishes to put out.

I wouldn't recommend doing this at all.
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Old 06-04-2012, 12:30 AM #86
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by tsteele93 View Post
Ok, how about this one?

PCMC053T-1R5MN Susumu | 408-1371-1-ND | DigiKey

Inductance 1.5µH

Current 6A
Current - Saturation 10A
Current - Temperature Rise -

Tolerance ±20%
Shielding Unshielded
DC Resistance (DCR) 20 mOhm Max

Applications General Purpose

Package / Case 0.205" L x 0.185" W x 0.118" H (5.20mm x 4.70mm x 3.00mm)
Parameters are ok (40°C rise current of 6A is lower than coilcraft but it should go), lenght (5.2mm) is ok, width (4.7mm) is somewhat big but it should go... nice inductor
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Old 06-04-2012, 12:53 AM #87
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by Wolfman29 View Post
Interesting, luke. Mind throwing up a schematic? I think I am getting what you are saying, but not sure.


This is the schematic.
The schottky diode protects the driver against reverse current flow and the lasorb protects the laser diode against overcurrents and spikes at power-on power-off.
To make a test with a given driver i would suggest to use a test load and to check the currents values and waveforms at all conditions (power-off, power-on and operational).
Attached Thumbnails
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Old 06-04-2012, 12:54 AM #88
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

You sure that would work? What if the IC has a different Vcc vs. Vin pin? One for IC power, the other for inductor power?
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Old 06-04-2012, 01:16 AM #89
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by Wolfman29 View Post
You sure that would work? What if the IC has a different Vcc vs. Vin pin? One for IC power, the other for inductor power?
If you look at any battery charger schematic you will find two protection diodes, one in series at the output and another between the output and the input of the regulator (in parallel with the regulator...). This is done to control the currents directions (block the flow) and so the polarities when the regulator is powered off.
Every driver has a given schematic and so you must carefully consider the polarities (voltage differences) before adopting this connection.
For example a buck driver has an input voltage greater than output voltage, a boost driver the inverse and so you can choose the protection diode direction.

edit: to analyze the schematic and simplify your considerations you can move the battery after the laser diode (connect the battery negative to the diode cathode and the battery positive to ground, for the functionality consideration this is equivalent to the previous schematic).
Also you can test this configuration simply by using a dual output power supply

Attached Thumbnails
17mm buck-boost driver (TPS63020 and LT6106)-sch1.jpg  

Last edited by laserluke; 06-04-2012 at 03:01 AM.
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Old 06-04-2012, 05:17 AM #90
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

what exactly is the "lasorb" component there?
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Old 06-04-2012, 08:48 AM #91
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by foulmist View Post
what exactly is the "lasorb" component there?
You can find here the link to the product pages and here is the datasheet of the specific model for blue laser diodes
Attached Files
File Type: pdf LASORB_L44-683-X.pdf (1.81 MB, 234 views)
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Old 06-04-2012, 08:59 AM #92
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

https://www.pangolin.com/orders/lasorb.php

About $8 each...
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Old 06-04-2012, 02:51 PM #93
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Driver 3A single Li-ion

Saw this on another forum. Dunno, dude hasn't gotten much attention besides me. Looks pretty decent, though. Maybe this wheel has already been invented.
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Old 06-04-2012, 03:05 PM #94
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by BShanahan14rulz View Post
Driver 3A single Li-ion

Saw this on another forum. Dunno, dude hasn't gotten much attention besides me. Looks pretty decent, though. Maybe this wheel has already been invented.
A few thoughts...

A. It is not open source. So you are buying from him.
B. How much is he charging?
C. What kind of availability?
D. It is a flashlight driver I think, so it may be designed for a far more robust diode and it may not have spike limiting for more sensitive laser diodes.
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Last edited by tsteele93; 06-04-2012 at 03:05 PM.
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Old 06-04-2012, 06:21 PM #95
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Ah, had my threads mixed up. Thought there was a different thread for an open source driver.

So how do you choose an inductor for this bad boy? match inductance, make sure saturation rating is higher than what is needed, and make sure 40*C rise in temp. is at a suitably high current value?
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Old 06-05-2012, 01:51 AM #96
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by BShanahan14rulz View Post
Ah, had my threads mixed up. Thought there was a different thread for an open source driver.

So how do you choose an inductor for this bad boy? match inductance, make sure saturation rating is higher than what is needed, and make sure 40*C rise in temp. is at a suitably high current value?
And the hard parts, it has to fit on the very small landing pad and be available. Coilcraft makes a very good, reasonably priced, low DCR 1.5uH inductor that would be great - except they don't let anyone else sell it and they aren't in stock right now.
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