Drivers for 445

[kevinmassey]

http://laserpointerforums.com/f65/warning-about-cr123-51889.html
Other people have had problems though.

 

[Exerd]

The 3.7V I've ordered has a capacity of 1300 maH, what sort of current draw on the battery would I be looking at with a microboost set at 700mA? Shouldn't be too much stress on the battery.

4 CR123A 3.7V Rechargeable Battery+Charger CR123 EL123A on eBay (end time 09-Jul-10 03:58:05 BST)

Those aren't going to output 1300mAH. Those are just no-name batts with a high advertisement. You got taken, sonny.

A CR123, RCR123, and 16340 are all 16mm diameter. Largest 16mm batt of that length is going to be a 900mAH.

Now, you can fit an 18350 (two of them) in an 18650 batt tube. That's 18mm and slightly fatter. Those will get you closer to a true 1200mAH.

Ultrafire 18350 1200mah 3.7v BUTTON TOP Rechargeable Lithium Battery Li-Ion UF18350

 

[daguin]

bump

Peace,
dave

 

[LazyBeam]

Browsing around a little more... these might work well for hosts to just replace the stock pill boards.
Guys, would these do the job? They step up so use with 1X 18650 should be OK, right?
The only thing that seems odd might be the BB Nextgen and its "safe mode"... any opinion on this??

GD Buck/Boost Converter Blank $18
Sandwich Shoppe
* This converter will step up or step down
* Minimum Vin: 1.8V
* Maximum Vin: 5.4V
* Maximum Vout: 5.4V
* Full Constant current regulation.
* Output adjustable: Two 0603 resistors

BB Nexgen Blank $15
Sandwich Shoppe
* Output adjustable: Two 0603 resistors
* Maximum Vin: 6V or Vout (which ever is lower).
* Maximum Vout: 6V or Vf (which ever is lower).

Badboy Step Up $14
http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=179
* Minimum Input Voltage: ~1.6V
* Maximum Input Voltage: 3V (1W/3W Luxeon) & (6V 5W Luxeon)
* Output Set by resistors

 

[Exerd]

Browsing around a little more... these might work well for hosts to just replace the stock pill boards.
Guys, would these do the job? They step up so use with 1X 18650 should be OK, right?
The only thing that seems odd might be the BB Nextgen and its "safe mode"... any opinion on this??

GD Buck/Boost Converter Blank $18
Sandwich Shoppe
* This converter will step up or step down
* Minimum Vin: 1.8V
* Maximum Vin: 5.4V
* Maximum Vout: 5.4V
* Full Constant current regulation.
* Output adjustable: Two 0603 resistors

BB Nexgen Blank $15
Sandwich Shoppe
* Output adjustable: Two 0603 resistors
# Maximum Vin: 6V or Vout (which ever is lower).
# Maximum Vout: 6V or Vf (which ever is lower).

This has already been posted in THIS thread.

 

[LazyBeam]

This has already been posted in THIS thread.

The boards posted here previously (SOB converter & SHARK Buck) are both step down converters. You'd need to input V>4.2
The boards I posted (Badboy/GD Boost) are apparently DIFFERENT step-up converters and should work with a single Li-Ion (I think)

 

[Exerd]

The boards posted here previously (SOB converter & SHARK Buck) are both step down converters. You'd need to input V>4.2
The boards I posted (Badboy/GD Boost) are apparently DIFFERENT step-up converters and should work with a single Li-Ion (I think)

You posted the specifications and obviously understand the operation, so I don't quite understand why you need to check with the forum when you already posted the answer.

 

[LazyBeam]

Because someone might know something I've missed. I've never seen these boards or used one. I can't be certain and killing a $50 diode isn't fun when asking a question is prudent.
Plus that "Safe Mode" on the one converter looks like it might be problematic... maybe not... ??
I just thought I'd ask and that I'd share the converters with LPF in case someone was looking for something like this.

 

[drlava]

because those LED converter boards weren't designed to drive laser diodes, they don't have as much filter capacitance as the MicroBoost and FlexDrive, which will lead to current spikes on the diode. For LEDs, that's OK but it can shorten the lifetime of laser diodes. Looking at those LED converter boards, you can see that fewer capacitors are used.

I saw some confusion earlier.. the upgrade that the MicroBoost gives over the FlexDrive V5 is 1) higher output voltage for blu rays >6V and 2) also higher output power.

Note that two flexdrives or 2 boost drives can be operated in parallel!

For high power applications like this, an 18650 host is highly reccomended.

 

[metaman]

Edit: it was late, confused parallel for in series. My bad.

 

[jander6442]

because those LED converter boards weren't designed to drive laser diodes, they don't have as much filter capacitance as the MicroBoost and FlexDrive, which will lead to current spikes on the diode. For LEDs, that's OK but it can shorten the lifetime of laser diodes. Looking at those LED converter boards, you can see that fewer capacitors are used.

I saw some confusion earlier.. the upgrade that the MicroBoost gives over the FlexDrive V5 is 1) higher output voltage for blu rays >6V and 2) also higher output power.

Note that two flexdrives or 2 boost drives can be operated in parallel!

For high power applications like this, an 18650 host is highly reccomended.

pics please:wave:

 

[BShanahan14rulz]

Does that mean two microboosts, each with their own single Li-Ion cell, but with both the diode + pads connected to the diode and both the diode - pads connected to the diode case, or can you run the paralleled microboosts off of the same cell?

 

[Exerd]

You can run parallel supplies off of a single source so long as the source can provide the current to each.

Think of all the 12V instruments in a car running off of the same battery.

 

[Mrcrouse]

What driver should I use to power one if I want to use 2 18650 batteries in series? Could I use 2 Rkcstr drivers in parallel to obtain a higher current?

 

[Exerd]

What driver should I use to power one if I want to use 2 18650 batteries in series? Could I use 2 Rkcstr drivers in parallel to obtain a higher current?

It's quite simple.

You use electronics that meet the specifications.

Two of those batteries in series means starting voltage of 8.4V.

Use the driver of your choice which lists specifications for that range of voltage.

If the load will pull the amperage you attempt to give it, any amount of drivers can be put into the circuit to keep feeding more and more power to the load. Don't use this theory with A/C electronics, though.

 

[Xer0]

How low can i drive a Casio 445nm diode? Are 15mW possible, and at what current?